diff --git a/bsp/thead-smart/applications/main.c b/bsp/thead-smart/applications/main.c
index 61046f4a4bce53ec0d4c8b30d7f5c879d0bb8291..daa453c08a284ae45c85c356945a007a9ca2fa1b 100644
--- a/bsp/thead-smart/applications/main.c
+++ b/bsp/thead-smart/applications/main.c
@@ -12,7 +12,7 @@
 
 int main(void)
 {
-    
+
     return 0;
 }
 
diff --git a/bsp/thead-smart/drivers/board.c b/bsp/thead-smart/drivers/board.c
index 386d40d3a5df0d0d450756abcd0e13fd1e82f880..fab927858744547dca0627ff6c60b92db139310f 100644
--- a/bsp/thead-smart/drivers/board.c
+++ b/bsp/thead-smart/drivers/board.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -26,7 +26,7 @@ extern void ioreuse_initial(void);
 
 
 /**
- * This function will initial smartl-evb(e906) board.
+ * This function will initial smart-evb board.
  */
 void rt_hw_board_init(void)
 {
diff --git a/bsp/thead-smart/drivers/board_uart.c b/bsp/thead-smart/drivers/board_uart.c
index d4f857f0bbd498d7ee61570121572e8e2f349d5e..498769fc0b17bf3fbc9b6fd12eb3f485e9013522 100644
--- a/bsp/thead-smart/drivers/board_uart.c
+++ b/bsp/thead-smart/drivers/board_uart.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -35,7 +35,7 @@ struct
     uint32_t base;
     uint32_t irq;
     void *handler;
-} 
+}
 const sg_usart_config[CONFIG_USART_NUM] =
 {
     {CSKY_UART_BASE, UART_IRQn, ck_usart0_irqhandler},
@@ -44,22 +44,22 @@ const sg_usart_config[CONFIG_USART_NUM] =
 
 int32_t target_usart_init(int32_t idx, uint32_t *base, uint32_t *irq, void **handler)
 {
-    if (idx >= CONFIG_USART_NUM) 
+    if (idx >= CONFIG_USART_NUM)
     {
         return -1;
     }
 
-    if (base != NULL) 
+    if (base != NULL)
     {
         *base = sg_usart_config[idx].base;
     }
 
-    if (irq != NULL) 
+    if (irq != NULL)
     {
         *irq = sg_usart_config[idx].irq;
     }
 
-    if (handler != NULL) 
+    if (handler != NULL)
     {
         *handler = sg_usart_config[idx].handler;
     }
diff --git a/bsp/thead-smart/drivers/ck_irq.c b/bsp/thead-smart/drivers/ck_irq.c
index 8863ec7580d57c1e2401be512fba06811a3da934..04d5c5bee06f9aca8035c67c23409452236497e1 100644
--- a/bsp/thead-smart/drivers/ck_irq.c
+++ b/bsp/thead-smart/drivers/ck_irq.c
@@ -25,7 +25,7 @@ extern void (*g_nmivector)(void);
 */
 void drv_irq_enable(uint32_t irq_num)
 {
-    if (NMI_EXPn != irq_num) 
+    if (NMI_EXPn != irq_num)
     {
     #ifdef CONFIG_SYSTEM_SECURE
         csi_vic_enable_sirq(irq_num);
@@ -42,7 +42,7 @@ void drv_irq_enable(uint32_t irq_num)
 */
 void drv_irq_disable(uint32_t irq_num)
 {
-    if (NMI_EXPn != irq_num) 
+    if (NMI_EXPn != irq_num)
     {
     #ifdef CONFIG_SYSTEM_SECURE
         csi_vic_disable_sirq(irq_num);
@@ -60,11 +60,11 @@ void drv_irq_disable(uint32_t irq_num)
 */
 void drv_irq_register(uint32_t irq_num, void *irq_handler)
 {
-    if (NMI_EXPn != irq_num) 
+    if (NMI_EXPn != irq_num)
     {
         g_irqvector[irq_num] = irq_handler;
-    } 
-    else 
+    }
+    else
     {
         g_nmivector = irq_handler;
     }
@@ -77,11 +77,11 @@ void drv_irq_register(uint32_t irq_num, void *irq_handler)
 */
 void drv_irq_unregister(uint32_t irq_num)
 {
-    if (NMI_EXPn != irq_num) 
+    if (NMI_EXPn != irq_num)
     {
         g_irqvector[irq_num] = (void *)Default_Handler;
-    } 
-    else 
+    }
+    else
     {
         g_nmivector = (void *)Default_Handler;
     }
diff --git a/bsp/thead-smart/drivers/ck_usart.c b/bsp/thead-smart/drivers/ck_usart.c
index bedec214abafca51258e2bb6d9e2b4788c0de7b4..b0df7469e73f23bcda2de040b26b8361f2411c9e 100644
--- a/bsp/thead-smart/drivers/ck_usart.c
+++ b/bsp/thead-smart/drivers/ck_usart.c
@@ -37,7 +37,7 @@
 
 #define USART_NULL_PARAM_CHK(para) HANDLE_PARAM_CHK(para, ERR_USART(DRV_ERROR_PARAMETER))
 
-typedef struct 
+typedef struct
 {
     uint32_t base;
     uint32_t irq;
@@ -59,7 +59,7 @@ extern int32_t target_usart_init(int32_t idx, uint32_t *base, uint32_t *irq, voi
 
 static ck_usart_priv_t usart_instance[CONFIG_USART_NUM];
 
-static const usart_capabilities_t usart_capabilities = 
+static const usart_capabilities_t usart_capabilities =
 {
     .asynchronous = 1,          /* supports USART (Asynchronous) mode */
     .synchronous_master = 0,    /* supports Synchronous Master mode */
@@ -86,10 +86,10 @@ int32_t csi_usart_config_baudrate(usart_handle_t handle, uint32_t baud)
     /* baudrate=(seriak clock freq)/(16*divisor); algorithm :rounding*/
     uint32_t divisor = ((drv_get_usart_freq(usart_priv->idx)  * 10) / baud) >> 4;
 
-    if ((divisor % 10) >= 5) 
+    if ((divisor % 10) >= 5)
     {
         divisor = (divisor / 10) + 1;
-    } else 
+    } else
     {
         divisor = divisor / 10;
     }
@@ -117,7 +117,7 @@ int32_t csi_usart_config_mode(usart_handle_t handle, usart_mode_e mode)
 {
     USART_NULL_PARAM_CHK(handle);
 
-    if (mode == USART_MODE_ASYNCHRONOUS) 
+    if (mode == USART_MODE_ASYNCHRONOUS)
     {
         return 0;
     }
@@ -139,7 +139,7 @@ int32_t csi_usart_config_parity(usart_handle_t handle, usart_parity_e parity)
 
     WAIT_USART_IDLE(addr);
 
-    switch (parity) 
+    switch (parity)
     {
         case USART_PARITY_NONE:
             /*CLear the PEN bit(LCR[3]) to disable parity.*/
@@ -179,7 +179,7 @@ int32_t csi_usart_config_stopbits(usart_handle_t handle, usart_stop_bits_e stopb
 
     WAIT_USART_IDLE(addr);
 
-    switch (stopbit) 
+    switch (stopbit)
     {
         case USART_STOP_BITS_1:
             /* Clear the STOP bit to set 1 stop bit*/
@@ -223,7 +223,7 @@ int32_t csi_usart_config_databits(usart_handle_t handle, usart_data_bits_e datab
      *       11 -- 8 bits
      */
 
-    switch (databits) 
+    switch (databits)
     {
         case USART_DATA_BITS_5:
             addr->LCR &= LCR_WORD_SIZE_5;
@@ -312,7 +312,7 @@ int csi_uart_getchar(usart_handle_t handle)
 
     if (addr->LSR & LSR_DATA_READY)
     {
-    	ch = addr->RBR & 0xff;
+        ch = addr->RBR & 0xff;
     }
 
     return ch;
@@ -332,11 +332,11 @@ int32_t csi_usart_putchar(usart_handle_t handle, uint8_t ch)
     ck_usart_reg_t *addr = (ck_usart_reg_t *)(usart_priv->base);
     uint32_t timecount = 0;
 
-    while ((!(addr->LSR & DW_LSR_TRANS_EMPTY))) 
+    while ((!(addr->LSR & DW_LSR_TRANS_EMPTY)))
     {
         timecount++;
 
-        if (timecount >= UART_BUSY_TIMEOUT) 
+        if (timecount >= UART_BUSY_TIMEOUT)
         {
             return ERR_USART(DRV_ERROR_TIMEOUT);
         }
@@ -354,7 +354,7 @@ int32_t csi_usart_putchar(usart_handle_t handle, uint8_t ch)
 */
 void ck_usart_intr_threshold_empty(int32_t idx, ck_usart_priv_t *usart_priv)
 {
-    if (usart_priv->tx_total_num == 0) 
+    if (usart_priv->tx_total_num == 0)
     {
         return;
     }
@@ -362,7 +362,7 @@ void ck_usart_intr_threshold_empty(int32_t idx, ck_usart_priv_t *usart_priv)
     volatile int i = 500;
     ck_usart_reg_t *addr = (ck_usart_reg_t *)(usart_priv->base);
 
-    if (usart_priv->tx_cnt >= usart_priv->tx_total_num) 
+    if (usart_priv->tx_cnt >= usart_priv->tx_total_num)
     {
         addr->IER &= (~IER_THRE_INT_ENABLE);
         usart_priv->last_tx_num = usart_priv->tx_total_num;
@@ -379,11 +379,11 @@ void ck_usart_intr_threshold_empty(int32_t idx, ck_usart_priv_t *usart_priv)
         usart_priv->tx_buf = NULL;
         usart_priv->tx_total_num = 0;
 
-        if (usart_priv->cb_event) 
+        if (usart_priv->cb_event)
         {
             usart_priv->cb_event(idx, USART_EVENT_SEND_COMPLETE);
         }
-    } else 
+    } else
     {
         /* fix hardware bug */
         while (addr->USR & USR_UART_BUSY);
@@ -411,7 +411,7 @@ static void ck_usart_intr_recv_data(int32_t idx, ck_usart_priv_t *usart_priv)
     usart_priv->rx_cnt++;
     usart_priv->rx_buf++;
 
-    if (usart_priv->rx_cnt >= usart_priv->rx_total_num) 
+    if (usart_priv->rx_cnt >= usart_priv->rx_total_num)
     {
         usart_priv->last_rx_num = usart_priv->rx_total_num;
         usart_priv->rx_cnt = 0;
@@ -419,7 +419,7 @@ static void ck_usart_intr_recv_data(int32_t idx, ck_usart_priv_t *usart_priv)
         usart_priv->rx_busy = 0;
         usart_priv->rx_total_num = 0;
 
-        if (usart_priv->cb_event) 
+        if (usart_priv->cb_event)
         {
             usart_priv->cb_event(idx, USART_EVENT_RECEIVE_COMPLETE);
         }
@@ -440,14 +440,14 @@ static void ck_usart_intr_recv_line(int32_t idx, ck_usart_priv_t *usart_priv)
 
     uint32_t timecount = 0;
 
-    while (addr->LSR & 0x1) 
+    while (addr->LSR & 0x1)
     {
         addr->RBR;
         timecount++;
 
-        if (timecount >= UART_BUSY_TIMEOUT) 
+        if (timecount >= UART_BUSY_TIMEOUT)
         {
-            if (usart_priv->cb_event) 
+            if (usart_priv->cb_event)
             {
                 usart_priv->cb_event(idx, USART_EVENT_RX_TIMEOUT);
             }
@@ -459,9 +459,9 @@ static void ck_usart_intr_recv_line(int32_t idx, ck_usart_priv_t *usart_priv)
     /** Break Interrupt bit. This is used to indicate the detection of a
       * break sequence on the serial input data.
       */
-    if (lsr_stat & DW_LSR_BI) 
+    if (lsr_stat & DW_LSR_BI)
     {
-        if (usart_priv->cb_event) 
+        if (usart_priv->cb_event)
         {
             usart_priv->cb_event(idx, USART_EVENT_RX_BREAK);
         }
@@ -473,9 +473,9 @@ static void ck_usart_intr_recv_line(int32_t idx, ck_usart_priv_t *usart_priv)
       * framing error in the receiver. A framing error occurs when the receiver
       * does not detect a valid STOP bit in the received data.
       */
-    if (lsr_stat & DW_LSR_FE) 
+    if (lsr_stat & DW_LSR_FE)
     {
-        if (usart_priv->cb_event) 
+        if (usart_priv->cb_event)
         {
             usart_priv->cb_event(idx, USART_EVENT_RX_FRAMING_ERROR);
         }
@@ -487,9 +487,9 @@ static void ck_usart_intr_recv_line(int32_t idx, ck_usart_priv_t *usart_priv)
       * framing error in the receiver. A framing error occurs when the
       * receiver does not detect a valid STOP bit in the received data.
       */
-    if (lsr_stat & DW_LSR_PE) 
+    if (lsr_stat & DW_LSR_PE)
     {
-        if (usart_priv->cb_event) 
+        if (usart_priv->cb_event)
         {
             usart_priv->cb_event(idx, USART_EVENT_RX_PARITY_ERROR);
         }
@@ -500,9 +500,9 @@ static void ck_usart_intr_recv_line(int32_t idx, ck_usart_priv_t *usart_priv)
     /** Overrun error bit. This is used to indicate the occurrence of an overrun error.
       * This occurs if a new data character was received before the previous data was read.
       */
-    if (lsr_stat & DW_LSR_OE) 
+    if (lsr_stat & DW_LSR_OE)
     {
-        if (usart_priv->cb_event) 
+        if (usart_priv->cb_event)
         {
             usart_priv->cb_event(idx, USART_EVENT_RX_OVERFLOW);
         }
@@ -516,29 +516,29 @@ static void ck_usart_intr_recv_line(int32_t idx, ck_usart_priv_t *usart_priv)
 */
 static void ck_usart_intr_char_timeout(int32_t idx, ck_usart_priv_t *usart_priv)
 {
-    if ((usart_priv->rx_total_num != 0) && (usart_priv->rx_buf != NULL)) 
+    if ((usart_priv->rx_total_num != 0) && (usart_priv->rx_buf != NULL))
     {
         ck_usart_intr_recv_data(idx, usart_priv);
         return;
     }
 
-    if (usart_priv->cb_event) 
+    if (usart_priv->cb_event)
     {
         usart_priv->cb_event(idx, USART_EVENT_RECEIVED);
-    } else 
+    } else
     {
         ck_usart_reg_t *addr = (ck_usart_reg_t *)(usart_priv->base);
 
         uint32_t timecount = 0;
 
-        while (addr->LSR & 0x1) 
+        while (addr->LSR & 0x1)
         {
             addr->RBR;
             timecount++;
 
-            if (timecount >= UART_BUSY_TIMEOUT) 
+            if (timecount >= UART_BUSY_TIMEOUT)
             {
-                if (usart_priv->cb_event) 
+                if (usart_priv->cb_event)
                 {
                     usart_priv->cb_event(idx, USART_EVENT_RX_TIMEOUT);
                 }
@@ -560,7 +560,7 @@ void ck_usart_irqhandler(int32_t idx)
 
     uint8_t intr_state = addr->IIR & 0xf;
 
-    switch (intr_state) 
+    switch (intr_state)
     {
         case DW_IIR_THR_EMPTY:       /* interrupt source:transmitter holding register empty */
             ck_usart_intr_threshold_empty(idx, usart_priv);
@@ -591,7 +591,7 @@ void ck_usart_irqhandler(int32_t idx)
 */
 usart_capabilities_t csi_usart_get_capabilities(int32_t idx)
 {
-    if (idx < 0 || idx >= CONFIG_USART_NUM) 
+    if (idx < 0 || idx >= CONFIG_USART_NUM)
     {
         usart_capabilities_t ret;
         memset(&ret, 0, sizeof(usart_capabilities_t));
@@ -615,7 +615,7 @@ usart_handle_t csi_usart_initialize(int32_t idx, usart_event_cb_t cb_event)
 
     int32_t ret = target_usart_init(idx, &base, &irq, &handler);
 
-    if (ret < 0 || ret >= CONFIG_USART_NUM) 
+    if (ret < 0 || ret >= CONFIG_USART_NUM)
     {
         return NULL;
     }
@@ -675,7 +675,7 @@ int32_t csi_usart_config(usart_handle_t handle,
     /* control the data_bit of the usart*/
     ret = csi_usart_config_baudrate(handle, baud);
 
-    if (ret < 0) 
+    if (ret < 0)
     {
         return ret;
     }
@@ -683,7 +683,7 @@ int32_t csi_usart_config(usart_handle_t handle,
     /* control mode of the usart*/
     ret = csi_usart_config_mode(handle, mode);
 
-    if (ret < 0) 
+    if (ret < 0)
     {
         return ret;
     }
@@ -691,7 +691,7 @@ int32_t csi_usart_config(usart_handle_t handle,
     /* control the parity of the usart*/
     ret = csi_usart_config_parity(handle, parity);
 
-    if (ret < 0) 
+    if (ret < 0)
     {
         return ret;
     }
@@ -699,14 +699,14 @@ int32_t csi_usart_config(usart_handle_t handle,
     /* control the stopbit of the usart*/
     ret = csi_usart_config_stopbits(handle, stopbits);
 
-    if (ret < 0) 
+    if (ret < 0)
     {
         return ret;
     }
 
     ret = csi_usart_config_databits(handle, bits);
 
-    if (ret < 0) 
+    if (ret < 0)
     {
         return ret;
     }
@@ -729,7 +729,7 @@ int32_t csi_usart_send(usart_handle_t handle, const void *data, uint32_t num)
     USART_NULL_PARAM_CHK(handle);
     USART_NULL_PARAM_CHK(data);
 
-    if (num == 0) 
+    if (num == 0)
     {
         return ERR_USART(DRV_ERROR_PARAMETER);
     }
@@ -811,12 +811,12 @@ int32_t csi_usart_receive_query(usart_handle_t handle, void *data, uint32_t num)
     int32_t recv_num = 0;
     uint8_t *dest = (uint8_t *)data;
 
-    while (addr->LSR & 0x1) 
+    while (addr->LSR & 0x1)
     {
         *dest++ = addr->RBR;
         recv_num++;
 
-        if (recv_num >= num) 
+        if (recv_num >= num)
         {
             break;
         }
@@ -876,7 +876,7 @@ usart_status_t csi_usart_get_status(usart_handle_t handle)
 
     memset(&usart_status, 0, sizeof(usart_status_t));
 
-    if (handle == NULL) 
+    if (handle == NULL)
     {
         return usart_status;
     }
@@ -888,17 +888,17 @@ usart_status_t csi_usart_get_status(usart_handle_t handle)
     usart_status.tx_busy = usart_priv->tx_busy;
     usart_status.rx_busy = usart_priv->rx_busy;
 
-    if (line_status_reg & DW_LSR_BI) 
+    if (line_status_reg & DW_LSR_BI)
     {
         usart_status.rx_break = 1;
     }
 
-    if (line_status_reg & DW_LSR_FE) 
+    if (line_status_reg & DW_LSR_FE)
     {
         usart_status.rx_framing_error = 1;
     }
 
-    if (line_status_reg & DW_LSR_PE) 
+    if (line_status_reg & DW_LSR_PE)
     {
         usart_status.rx_parity_error = 1;
     }
@@ -961,26 +961,26 @@ int32_t csi_usart_flush(usart_handle_t handle, usart_flush_type_e type)
     uint32_t timecount = 0;
 
     if (type == USART_FLUSH_WRITE) {
-        while ((!(addr->LSR & DW_LSR_TEMT))) 
+        while ((!(addr->LSR & DW_LSR_TEMT)))
         {
             timecount++;
 
-            if (timecount >= UART_BUSY_TIMEOUT) 
+            if (timecount >= UART_BUSY_TIMEOUT)
             {
                 return ERR_USART(DRV_ERROR_TIMEOUT);
             }
         }
-    } else if (type == USART_FLUSH_READ) 
+    } else if (type == USART_FLUSH_READ)
     {
         while (addr->LSR & 0x1) {
             timecount++;
 
-            if (timecount >= UART_BUSY_TIMEOUT) 
+            if (timecount >= UART_BUSY_TIMEOUT)
             {
                 return ERR_USART(DRV_ERROR_TIMEOUT);
             }
         }
-    } else 
+    } else
     {
         return ERR_USART(DRV_ERROR_PARAMETER);
     }
@@ -1002,16 +1002,16 @@ int32_t csi_usart_set_interrupt(usart_handle_t handle, usart_intr_type_e type, i
     ck_usart_priv_t *usart_priv = handle;
     ck_usart_reg_t *addr = (ck_usart_reg_t *)(usart_priv->base);
 
-    switch (type) 
+    switch (type)
     {
         case USART_INTR_WRITE:
-            if (flag == 0) 
+            if (flag == 0)
             {
                 addr->IER &= ~IER_THRE_INT_ENABLE;
-            } else if (flag == 1) 
+            } else if (flag == 1)
             {
                 addr->IER |= IER_THRE_INT_ENABLE;
-            } else 
+            } else
             {
                 return ERR_USART(DRV_ERROR_PARAMETER);
             }
@@ -1019,13 +1019,13 @@ int32_t csi_usart_set_interrupt(usart_handle_t handle, usart_intr_type_e type, i
             break;
 
         case USART_INTR_READ:
-            if (flag == 0) 
+            if (flag == 0)
             {
                 addr->IER &= ~IER_RDA_INT_ENABLE;
-            } else if (flag == 1) 
+            } else if (flag == 1)
             {
                 addr->IER |= IER_RDA_INT_ENABLE;
-            } else 
+            } else
             {
                 return ERR_USART(DRV_ERROR_PARAMETER);
             }
@@ -1051,10 +1051,10 @@ uint32_t csi_usart_get_tx_count(usart_handle_t handle)
 
     ck_usart_priv_t *usart_priv = handle;
 
-    if (usart_priv->tx_busy) 
+    if (usart_priv->tx_busy)
     {
         return usart_priv->tx_cnt;
-    } else 
+    } else
     {
         return usart_priv->last_tx_num;
     }
@@ -1070,10 +1070,10 @@ uint32_t csi_usart_get_rx_count(usart_handle_t handle)
     USART_NULL_PARAM_CHK(handle);
     ck_usart_priv_t *usart_priv = handle;
 
-    if (usart_priv->rx_busy) 
+    if (usart_priv->rx_busy)
     {
         return usart_priv->rx_cnt;
-    } else 
+    } else
     {
         return usart_priv->last_rx_num;
     }
@@ -1102,7 +1102,7 @@ int32_t csi_usart_config_flowctrl(usart_handle_t handle,
 {
     USART_NULL_PARAM_CHK(handle);
 
-    switch (flowctrl_type) 
+    switch (flowctrl_type)
     {
         case USART_FLOWCTRL_CTS:
             return ERR_USART(DRV_ERROR_UNSUPPORTED);
diff --git a/bsp/thead-smart/drivers/ck_usart.h b/bsp/thead-smart/drivers/ck_usart.h
index bdaba45c4cc74e3bc069d17f406a016124038e41..45d3ca5747262f789dc4f265e41ebba0f757e12c 100644
--- a/bsp/thead-smart/drivers/ck_usart.h
+++ b/bsp/thead-smart/drivers/ck_usart.h
@@ -19,11 +19,11 @@
 extern "C" {
 #endif
 
-#define BAUDRATE_DEFAULT	19200
+#define BAUDRATE_DEFAULT    19200
 #define UART_BUSY_TIMEOUT       1000000
 #define UART_RECEIVE_TIMEOUT    1000
 #define UART_TRANSMIT_TIMEOUT   1000
-#define UART_MAX_FIFO	        0x10
+#define UART_MAX_FIFO           0x10
 /* UART register bit definitions */
 
 #define USR_UART_BUSY           0x01
@@ -64,13 +64,13 @@ extern "C" {
 
 typedef struct
 {
-    union 
+    union
     {
         __IM uint32_t RBR;           /* Offset: 0x000 (R/ )  Receive buffer register */
         __OM uint32_t THR;           /* Offset: 0x000 ( /W)  Transmission hold register */
         __IOM uint32_t DLL;          /* Offset: 0x000 (R/W)  Clock frequency division low section register */
     };
-    union 
+    union
     {
         __IOM uint32_t DLH;          /* Offset: 0x004 (R/W)  Clock frequency division high section register */
         __IOM uint32_t IER;          /* Offset: 0x004 (R/W)  Interrupt enable register */
diff --git a/bsp/thead-smart/drivers/core_rv32.h b/bsp/thead-smart/drivers/core_rv32.h
index 87fccfba72bade85a19f404bac1d815795127231..6aa07119bbe816dc0e2201bd9726df6ded429656 100644
--- a/bsp/thead-smart/drivers/core_rv32.h
+++ b/bsp/thead-smart/drivers/core_rv32.h
@@ -290,6 +290,42 @@ typedef struct
 /*@} end of group CSI_CACHE */
 
 
+#define SYSMAP_SYSMAPCFG_B_Pos                       0U                                    /*!< SYSMAP SYSMAPCFG: B Position */
+#define SYSMAP_SYSMAPCFG_B_Msk                       (0x1UL << SYSMAP_SYSMAPCFG_B_Pos)           /*!< SYSMAP SYSMAPCFG: B Mask */
+#define SYSMAP_SYSMAPCFG_C_Pos                       1U                                    /*!< SYSMAP SYSMAPCFG: C Position */
+#define SYSMAP_SYSMAPCFG_C_Msk                       (0x1UL << SYSMAP_SYSMAPCFG_C_Pos)           /*!< SYSMAP SYSMAPCFG: C Mask */
+#define SYSMAP_SYSMAPCFG_SO_Pos                      2U                                    /*!< SYSMAP SYSMAPCFG: SO Position */
+#define SYSMAP_SYSMAPCFG_SO_Msk                      (0x1UL << SYSMAP_SYSMAPCFG_SO_Pos)          /*!< SYSMAP SYSMAPCFG: SO Mask */
+/**
+  \ingroup    CSI_core_register
+  \defgroup   CSI_SYSMAP system map (SYSMAP)
+  \brief      Type definitions for the SYSMAP Registers
+  @{
+ */
+typedef struct
+{
+    __IOM uint32_t SYSMAPADDR0;               /*!< Offset: 0x000 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPCFG0;              /*!< Offset: 0x004 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPADDR1;               /*!< Offset: 0x008 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPCFG1;              /*!< Offset: 0x00c (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPADDR2;               /*!< Offset: 0x010 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPCFG2;              /*!< Offset: 0x014 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPADDR3;               /*!< Offset: 0x018 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPCFG3;              /*!< Offset: 0x01c (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPADDR4;               /*!< Offset: 0x020 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPCFG4;              /*!< Offset: 0x024 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPADDR5;               /*!< Offset: 0x028 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPCFG5;              /*!< Offset: 0x02c (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPADDR6;               /*!< Offset: 0x030 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPCFG6;              /*!< Offset: 0x034 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPADDR7;               /*!< Offset: 0x038 (R/W)  SYSMAP configure register */
+    __IOM uint32_t SYSMAPCFG7;              /*!< Offset: 0x03c (R/W)  SYSMAP configure register */
+} SYSMAP_Type;
+
+
+/*@} end of group CSI_SYSMAP */
+
+
 /**
   \ingroup  CSI_core_register
   \defgroup CSI_SysTick     System Tick Timer (CORET)
@@ -383,12 +419,14 @@ typedef struct
 #define TCIP_BASE           (0xE000E000UL)                            /*!< Titly Coupled IP Base Address */
 #define CORET_BASE          (0xE0004000UL)                            /*!< CORET Base Address */
 #define CLIC_BASE           (0xE0800000UL)                            /*!< CLIC Base Address */
+#define SYSMAP_BASE         (0xEFFFF000UL)                            /*!< SYSMAP Base Address */
 #define DCC_BASE            (0xE4010000UL)                            /*!< DCC Base Address */
 #define CACHE_BASE          (TCIP_BASE +  0x1000UL)                   /*!< CACHE Base Address */
 
 #define CORET               ((CORET_Type   *)     CORET_BASE  )       /*!< SysTick configuration struct */
 #define CLIC                ((CLIC_Type    *)     CLIC_BASE   )       /*!< CLIC configuration struct */
 #define DCC                 ((DCC_Type     *)     DCC_BASE    )       /*!< DCC configuration struct */
+#define SYSMAP              ((SYSMAP_Type  *)     SYSMAP_BASE )       /*!< SYSMAP configuration struct */
 #define CACHE               ((CACHE_Type   *)     CACHE_BASE  )       /*!< cache configuration struct */
 
 /*@} */
@@ -646,7 +684,7 @@ __STATIC_INLINE void csi_mpu_disable_region(uint32_t idx)
  */
 __STATIC_INLINE uint32_t csi_coret_config(uint32_t ticks, int32_t IRQn)
 {
-    if (CORET->MTIMECMP) {
+    if ((CORET->MTIMECMP != 0) && (CORET->MTIMECMP != 0xffffffffffffffff)) {
         CORET->MTIMECMP = CORET->MTIMECMP + ticks;
     } else {
         CORET->MTIMECMP = CORET->MTIME + ticks;
@@ -691,6 +729,126 @@ __STATIC_INLINE uint32_t csi_coret_get_valueh(void)
 }
 
 /*@} end of CSI_Core_SysTickFunctions */
+/* ##########################   SYSMAP functions  #################################### */
+/**
+  \ingroup  CSI_Core_FunctionInterface
+  \defgroup CSI_Core_SYSMAPFunctions SYSMAP Functions
+  \brief    Functions that manage system map attribute
+  @{
+ */
+
+/**
+  \brief   Get SYSMAPCFGx Register by index
+  \details Returns the content of the SYSMAPxCFG Register.
+  \param [in]    idx    SYSMAP region index
+  \return               SYSMAPxCFG Register value
+ */
+__STATIC_INLINE uint8_t __get_SYSMAPCFGx(uint32_t idx)
+{
+    switch (idx)
+    {
+    case 0: return SYSMAP->SYSMAPCFG0;
+    case 1: return SYSMAP->SYSMAPCFG1;
+    case 2: return SYSMAP->SYSMAPCFG2;
+    case 3: return SYSMAP->SYSMAPCFG3;
+    case 4: return SYSMAP->SYSMAPCFG4;
+    case 5: return SYSMAP->SYSMAPCFG5;
+    case 6: return SYSMAP->SYSMAPCFG6;
+    case 7: return SYSMAP->SYSMAPCFG7;
+    default: return 0;
+    }
+}
+
+/**
+  \brief   Set SYSMAPCFGx by index
+  \details Writes the given value to the SYSMAPxCFG Register.
+  \param [in]    idx      SYSMAPx region index
+  \param [in]    sysmapxcfg  SYSMAPxCFG Register value to set
+ */
+__STATIC_INLINE void __set_SYSMAPCFGx(uint32_t idx, uint32_t sysmapxcfg)
+{
+    switch (idx)
+    {
+    case 0: SYSMAP->SYSMAPCFG0 = sysmapxcfg; break;
+    case 1: SYSMAP->SYSMAPCFG1 = sysmapxcfg; break;
+    case 2: SYSMAP->SYSMAPCFG2 = sysmapxcfg; break;
+    case 3: SYSMAP->SYSMAPCFG3 = sysmapxcfg; break;
+    case 4: SYSMAP->SYSMAPCFG4 = sysmapxcfg; break;
+    case 5: SYSMAP->SYSMAPCFG5 = sysmapxcfg; break;
+    case 6: SYSMAP->SYSMAPCFG6 = sysmapxcfg; break;
+    case 7: SYSMAP->SYSMAPCFG7 = sysmapxcfg; break;
+    default: return;
+    }
+}
+
+/**
+  \brief   Get SYSMAPADDRx Register by index
+  \details Returns the content of the SYSMAPADDRx Register.
+  \param [in]    idx    SYSMAP region index
+  \return               SYSMAPADDRx Register value
+ */
+__STATIC_INLINE uint32_t __get_SYSMAPADDRx(uint32_t idx)
+{
+    switch(idx)
+    {
+    case 0: return SYSMAP->SYSMAPADDR0;
+    case 1: return SYSMAP->SYSMAPADDR1;
+    case 2: return SYSMAP->SYSMAPADDR2;
+    case 3: return SYSMAP->SYSMAPADDR3;
+    case 4: return SYSMAP->SYSMAPADDR4;
+    case 5: return SYSMAP->SYSMAPADDR5;
+    case 6: return SYSMAP->SYSMAPADDR6;
+    case 7: return SYSMAP->SYSMAPADDR7;
+    default: return 0;
+    }
+}
+
+/**
+  \brief   Set SYSMAPADDRx by index
+  \details Writes the given value to the SYSMAPADDRx Register.
+  \param [in]    idx      SYSMAP region index
+  \param [in]    sysmapaddr  SYSMAPADDRx Register value to set
+ */
+__STATIC_INLINE void __set_SYSMAPADDRx(uint32_t idx, uint32_t sysmapxaddr)
+{
+    switch (idx)
+    {
+    case 0: SYSMAP->SYSMAPADDR0 = sysmapxaddr; break;
+    case 1: SYSMAP->SYSMAPADDR1 = sysmapxaddr; break;
+    case 2: SYSMAP->SYSMAPADDR2 = sysmapxaddr; break;
+    case 3: SYSMAP->SYSMAPADDR3 = sysmapxaddr; break;
+    case 4: SYSMAP->SYSMAPADDR4 = sysmapxaddr; break;
+    case 5: SYSMAP->SYSMAPADDR5 = sysmapxaddr; break;
+    case 6: SYSMAP->SYSMAPADDR6 = sysmapxaddr; break;
+    case 7: SYSMAP->SYSMAPADDR7 = sysmapxaddr; break;
+    default: return;
+    }
+}
+
+/**
+  \brief  configure system map attribute.
+  \details
+  \param [in]  idx        system map region (0, 1, 2, ..., 7).
+  \param [in]  base_addr  base address must be aligned with page size.
+  \param [in]  enable     enable or disable memory protected region.
+  */
+__STATIC_INLINE void csi_sysmap_config_region(uint32_t idx, uint32_t base_addr, uint32_t attr)
+{
+    uint32_t addr = 0;
+
+    if (idx > 7) {
+        return;
+    }
+
+    addr = base_addr >> 12;
+    attr = attr << 2;
+
+    __set_SYSMAPADDRx(idx, addr);
+    __set_SYSMAPCFGx(idx, attr);
+}
+
+/*@} end of CSI_Core_SYSMAPFunctions */
+
 
 /* ##################################### DCC function ########################################### */
 /**
@@ -986,7 +1144,7 @@ __STATIC_INLINE void csi_dcache_invalid_range (uint32_t *addr, int32_t dsize)
 __STATIC_INLINE void csi_dcache_clean_range (uint32_t *addr, int32_t dsize)
 {
 
-#if (__DCACHE_PRESENT == 1)
+#if (__DCACHE_PRESENT == 1U)
     int32_t op_size = dsize + (uint32_t)addr % 32;
     uint32_t op_addr = (uint32_t) addr & CACHE_INV_ADDR_Msk;
     int32_t linesize = 32;
diff --git a/bsp/thead-smart/drivers/csi_rv32_gcc.h b/bsp/thead-smart/drivers/csi_rv32_gcc.h
index bc52d66426d38829c5ea72d2b5860e324c556808..be99b0a08323de9e86b3402cdd52386f40148600 100644
--- a/bsp/thead-smart/drivers/csi_rv32_gcc.h
+++ b/bsp/thead-smart/drivers/csi_rv32_gcc.h
@@ -184,6 +184,29 @@ __ALWAYS_STATIC_INLINE void __set_MHCR(uint32_t mhcr)
     __ASM volatile("csrw mhcr, %0" : : "r"(mhcr));
 }
 
+/**
+  \brief   Get MHINT
+  \details Returns the content of the MHINT Register.
+  \return               MHINT Register value
+ */
+__ALWAYS_STATIC_INLINE uint32_t __get_MHINT(void)
+{
+    uint32_t result;
+
+    __ASM volatile("csrr %0, mhint" : "=r"(result));
+    return (result);
+}
+
+/**
+  \brief   Set MHINT
+  \details Writes the given value to the MHINT Register.
+  \param [in]           MHINT Register value to set
+ */
+__ALWAYS_STATIC_INLINE void __set_MHINT(uint32_t mhint)
+{
+    __ASM volatile("csrw mhint, %0" : : "r"(mhint));
+}
+
 /**
   \brief   Get MISA Register
   \details Returns the content of the MISA Register.
diff --git a/bsp/thead-smart/drivers/drv_common.h b/bsp/thead-smart/drivers/drv_common.h
index bc43b11e2c1531ccf73d674d7aacb382c5684f66..bae29f4284bad3e4180e132fe431fc85053ba07a 100644
--- a/bsp/thead-smart/drivers/drv_common.h
+++ b/bsp/thead-smart/drivers/drv_common.h
@@ -43,7 +43,7 @@ typedef void *drv_handle_t;
 /**
 \brief General power states
 */
-typedef enum  
+typedef enum
 {
     DRV_POWER_OFF,                        ///< Power off: no operation possible
     DRV_POWER_LOW,                        ///< Low Power mode: retain state, detect and signal wake-up events
diff --git a/bsp/thead-smart/drivers/dw_gpio.c b/bsp/thead-smart/drivers/dw_gpio.c
index 9ee3a3e4290b740f01df0f1376aa3af959af9f1c..e9314103321745cd46ccda2af622fd1c87b5a93c 100644
--- a/bsp/thead-smart/drivers/dw_gpio.c
+++ b/bsp/thead-smart/drivers/dw_gpio.c
@@ -31,7 +31,7 @@ extern int32_t drv_pin_config_mode(port_name_e port, uint8_t offset, gpio_mode_e
 
 typedef void *gpio_port_handle_t;
 
-typedef struct 
+typedef struct
 {
 #ifdef CONFIG_LPM
     uint8_t gpio_power_status;
@@ -46,7 +46,7 @@ typedef struct
     uint32_t value;             ///< gpio value
 } dw_gpio_priv_t;
 
-typedef struct 
+typedef struct
 {
     uint8_t     portidx;
     uint8_t     idx;
@@ -71,13 +71,13 @@ static int32_t gpio_set_direction(
     dw_gpio_priv_t *gpio_priv = port;
     dw_gpio_reg_t *gpio_reg = (dw_gpio_reg_t *)(gpio_priv->base);
 
-    if (direction == GPIO_DIRECTION_INPUT) 
+    if (direction == GPIO_DIRECTION_INPUT)
     {
         gpio_reg->SWPORT_DDR &= (~gpio_priv->mask);
-    } else if (direction == GPIO_DIRECTION_OUTPUT) 
+    } else if (direction == GPIO_DIRECTION_OUTPUT)
     {
         gpio_reg->SWPORT_DDR |= gpio_priv->mask;
-    } else 
+    } else
     {
         return ERR_GPIO(GPIO_ERROR_DIRECTION);
     }
@@ -139,7 +139,7 @@ static int32_t gpio_set_irq_mode(gpio_pin_handle_t pin, gpio_irq_mode_e irq_mode
     uint32_t offset = gpio_pin_priv->idx;
     uint32_t mask = 1 << offset;
 
-    switch (irq_mode) 
+    switch (irq_mode)
     {
         /* rising edge interrupt mode */
         case GPIO_IRQ_MODE_RISING_EDGE:
@@ -240,7 +240,7 @@ static void gpio_irq_disable(gpio_pin_handle_t pin)
 
 void dw_gpio_irqhandler(int idx)
 {
-    if (idx >= CONFIG_GPIO_NUM) 
+    if (idx >= CONFIG_GPIO_NUM)
     {
         return;
     }
@@ -251,24 +251,24 @@ void dw_gpio_irqhandler(int idx)
     uint8_t i;
 
     /* find the interrput pin */
-    for (i = 0; i < 32; i++) 
+    for (i = 0; i < 32; i++)
     {
-        if (value & (1U << i)) 
+        if (value & (1U << i))
         {
             uint32_t pin_idx = i;
 
 #ifndef CONFIG_CHIP_DANICA
             uint8_t j;
 
-            if (idx > 0) 
+            if (idx > 0)
             {
-                for (j = 0; j < idx; j++) 
+                for (j = 0; j < idx; j++)
                 {
                     pin_idx += gpio_handle[j].pin_num;
                 }
             }
 
-            if (pin_idx >= CONFIG_GPIO_PIN_NUM) 
+            if (pin_idx >= CONFIG_GPIO_PIN_NUM)
             {
                 return;
             }
@@ -279,7 +279,7 @@ void dw_gpio_irqhandler(int idx)
             gpio_irq_clear(gpio_pin_priv, (1 << i));  //clear the gpio interrupt
 
             /* execute the callback function */
-            if ((gpio_event_cb_t)(gpio_pin_priv->cb)) 
+            if ((gpio_event_cb_t)(gpio_pin_priv->cb))
             {
                 ((gpio_event_cb_t)(gpio_pin_priv->cb))(gpio_pin_priv->offset);
             }
@@ -304,7 +304,7 @@ gpio_port_handle_t csi_gpio_port_initialize(int32_t port)
     void *handler;
     int32_t idx = target_gpio_port_init(port, &base, &irq, &handler, &pin_num);
 
-    if (idx < 0 || idx >= CONFIG_GPIO_NUM) 
+    if (idx < 0 || idx >= CONFIG_GPIO_NUM)
     {
         return NULL;
     }
@@ -384,14 +384,14 @@ static void do_wakeup_sleep_action(void *handle)
 gpio_pin_handle_t csi_gpio_pin_initialize(int32_t gpio_pin, gpio_event_cb_t cb_event)
 {
 
-    if (gpio_pin < 0 || gpio_pin >= CONFIG_GPIO_PIN_NUM) 
+    if (gpio_pin < 0 || gpio_pin >= CONFIG_GPIO_PIN_NUM)
     {
         return NULL;
     }
 
     uint32_t i;
 
-    for (i = 0; i < CONFIG_GPIO_NUM; i++) 
+    for (i = 0; i < CONFIG_GPIO_NUM; i++)
     {
         csi_gpio_port_initialize(i);
     }
@@ -400,14 +400,14 @@ gpio_pin_handle_t csi_gpio_pin_initialize(int32_t gpio_pin, gpio_event_cb_t cb_e
     uint32_t port_idx;
     int32_t pin_idx = target_gpio_pin_init(gpio_pin, &port_idx);
 
-    if (pin_idx < 0) 
+    if (pin_idx < 0)
     {
         return NULL;
     }
 
     int32_t idx = pin_idx;
 
-    for (i = 0; i < port_idx; i++) 
+    for (i = 0; i < port_idx; i++)
     {
         idx += (gpio_handle[i].pin_num);
     }
@@ -430,7 +430,7 @@ gpio_pin_handle_t csi_gpio_pin_initialize(int32_t gpio_pin, gpio_event_cb_t cb_e
 */
 int32_t csi_gpio_pin_uninitialize(gpio_pin_handle_t handle)
 {
-    if (handle == NULL) 
+    if (handle == NULL)
     {
         return ERR_GPIO(DRV_ERROR_PARAMETER);
     }
@@ -455,7 +455,7 @@ int32_t csi_gpio_power_control(gpio_pin_handle_t handle, csi_power_stat_e state)
 
 #ifdef CONFIG_LPM
     dw_gpio_pin_priv_t *gpio_pin_priv = (dw_gpio_pin_priv_t *)handle;
-    power_cb_t callback = 
+    power_cb_t callback =
     {
         .wakeup = do_wakeup_sleep_action,
         .sleep = do_prepare_sleep_action,
@@ -509,7 +509,7 @@ int32_t csi_gpio_pin_config_direction(gpio_pin_handle_t handle,
 
     uint32_t ret = gpio_set_direction(gpio_priv, dir);
 
-    if (ret) 
+    if (ret)
     {
         return ret;
     }
@@ -542,7 +542,7 @@ int32_t csi_gpio_pin_config(gpio_pin_handle_t handle,
 
     uint32_t ret = gpio_set_direction(gpio_priv, dir);
 
-    if (ret) 
+    if (ret)
     {
         return ret;
     }
@@ -613,18 +613,18 @@ int32_t csi_gpio_pin_set_irq(gpio_pin_handle_t handle, gpio_irq_mode_e mode, boo
 
     uint32_t ret = 0;
 
-    if (enable) 
+    if (enable)
     {
         ret = gpio_set_irq_mode(handle, mode);
 
-        if (ret) 
+        if (ret)
         {
             return ret;
         }
 
         gpio_irq_enable(handle);
 
-    } else 
+    } else
     {
         gpio_irq_disable(handle);
 
diff --git a/bsp/thead-smart/drivers/dw_gpio.h b/bsp/thead-smart/drivers/dw_gpio.h
index 768cdf1b1d9068f89a01ada09ef750142204cf29..c41c78e4c46ae8ba72847a8e8c3b58672f93cfaf 100644
--- a/bsp/thead-smart/drivers/dw_gpio.h
+++ b/bsp/thead-smart/drivers/dw_gpio.h
@@ -19,7 +19,7 @@ extern "C" {
 #endif
 
 
-typedef struct 
+typedef struct
 {
     __IOM uint32_t SWPORT_DR;                     /* Offset: 0x000 (W/R)  PortA data register */
     __IOM uint32_t SWPORT_DDR;                    /* Offset: 0x004 (W/R)  PortA data direction register */
diff --git a/bsp/thead-smart/drivers/dw_timer.c b/bsp/thead-smart/drivers/dw_timer.c
index 5792d47a734113874beb92d20ee69f3df73fa9c7..d45404fd0224425ac30f2781a449ffd82552af2c 100644
--- a/bsp/thead-smart/drivers/dw_timer.c
+++ b/bsp/thead-smart/drivers/dw_timer.c
@@ -20,7 +20,7 @@
 
 #define TIMER_NULL_PARAM_CHK(para)  HANDLE_PARAM_CHK(para, ERR_TIMER(DRV_ERROR_PARAMETER))
 
-typedef struct 
+typedef struct
 {
 #ifdef CONFIG_LPM
     uint8_t timer_power_status;
@@ -59,7 +59,7 @@ void dw_timer_irqhandler(int idx)
 
     addr->TxEOI;
 
-    if (timer_priv->cb_event) 
+    if (timer_priv->cb_event)
     {
         return timer_priv->cb_event(idx, TIMER_EVENT_TIMEOUT);
     }
@@ -69,10 +69,10 @@ void dw_timer_irqhandler(int idx)
 #ifdef CONFIG_LPM
 static void manage_clock(timer_handle_t handle, uint8_t enable)
 {
-    if (handle == &timer_instance[0] || handle == &timer_instance[1]) 
+    if (handle == &timer_instance[0] || handle == &timer_instance[1])
     {
         drv_clock_manager_config(CLOCK_MANAGER_TIM, enable);
-    } else if (handle == &timer_instance[3] || handle == &timer_instance[2]) 
+    } else if (handle == &timer_instance[3] || handle == &timer_instance[2])
     {
         drv_clock_manager_config(CLOCK_MANAGER_TIM1, enable);
     }
@@ -103,7 +103,7 @@ static void do_wakeup_sleep_action(timer_handle_t handle)
 */
 timer_handle_t csi_timer_initialize(int32_t idx, timer_event_cb_t cb_event)
 {
-    if (idx < 0 || idx >= CONFIG_TIMER_NUM) 
+    if (idx < 0 || idx >= CONFIG_TIMER_NUM)
     {
         return NULL;
     }
@@ -114,7 +114,7 @@ timer_handle_t csi_timer_initialize(int32_t idx, timer_event_cb_t cb_event)
 
     int32_t real_idx = target_get_timer(idx, &base, &irq, &handler);
 
-    if (real_idx != idx) 
+    if (real_idx != idx)
     {
         return NULL;
     }
@@ -134,7 +134,7 @@ timer_handle_t csi_timer_initialize(int32_t idx, timer_event_cb_t cb_event)
     timer_deactive_control(addr);
     timer_priv->cb_event = cb_event;
 
-    if (cb_event != NULL) 
+    if (cb_event != NULL)
     {
         drv_irq_register(timer_priv->irq, handler);
         drv_irq_enable(timer_priv->irq);
@@ -172,7 +172,7 @@ int32_t csi_timer_power_control(timer_handle_t handle, csi_power_stat_e state)
 {
     TIMER_NULL_PARAM_CHK(handle);
 #ifdef CONFIG_LPM
-    power_cb_t callback = 
+    power_cb_t callback =
     {
         .wakeup = do_wakeup_sleep_action,
         .sleep = do_prepare_sleep_action,
@@ -197,7 +197,7 @@ int32_t csi_timer_config(timer_handle_t handle, timer_mode_e mode)
     dw_timer_priv_t *timer_priv = handle;
     dw_timer_reg_t *addr = (dw_timer_reg_t *)(timer_priv->base);
 
-    switch (mode) 
+    switch (mode)
     {
         case TIMER_MODE_FREE_RUNNING:
             addr->TxControl &= ~DW_TIMER_TXCONTROL_MODE;
@@ -248,15 +248,15 @@ int32_t csi_timer_start(timer_handle_t handle)
     uint32_t min_us = drv_get_timer_freq(timer_priv->idx) / 1000000;
     uint32_t load;
 
-    if (((timer_priv->timeout * drv_get_timer_freq(timer_priv->idx)) / 1000000) > 0xffffffff) 
+    if (((timer_priv->timeout * drv_get_timer_freq(timer_priv->idx)) / 1000000) > 0xffffffff)
     {
         return ERR_TIMER(DRV_ERROR_PARAMETER);
     }
 
-    if (min_us) 
+    if (min_us)
     {
         load = (uint32_t)(timer_priv->timeout * min_us);
-    } else 
+    } else
     {
         load = (uint32_t)(((uint64_t)(timer_priv->timeout) * drv_get_timer_freq(timer_priv->idx)) / 1000000);
     }
@@ -265,11 +265,11 @@ int32_t csi_timer_start(timer_handle_t handle)
 
     if (timer_priv->timeout == 0) {
         addr->TxLoadCount = 0xffffffff;                           /* load time(us) */
-    } else 
+    } else
     {
         if ((addr->TxControl | 0x2) == 0x2) {
             addr->TxLoadCount = 0xffffffff;                           /* load time(us) */
-        } else 
+        } else
         {
             addr->TxLoadCount = load;                           /* load time(us) */
         }
@@ -368,7 +368,7 @@ timer_status_t csi_timer_get_status(timer_handle_t handle)
 {
     timer_status_t timer_status = {0};
 
-    if (handle == NULL) 
+    if (handle == NULL)
     {
         return timer_status;
     }
@@ -376,12 +376,12 @@ timer_status_t csi_timer_get_status(timer_handle_t handle)
     dw_timer_priv_t *timer_priv = handle;
     dw_timer_reg_t *addr = (dw_timer_reg_t *)(timer_priv->base);
 
-    if (addr->TxControl & DW_TIMER_TXCONTROL_ENABLE) 
+    if (addr->TxControl & DW_TIMER_TXCONTROL_ENABLE)
     {
         timer_status.active = 1;
     }
 
-    if (timer_priv->timeout_flag == 1) 
+    if (timer_priv->timeout_flag == 1)
     {
         timer_status.timeout = 1;
     }
diff --git a/bsp/thead-smart/drivers/dw_timer.h b/bsp/thead-smart/drivers/dw_timer.h
index 7b418cac70afc2e578e9d9d5b73d6f7d2a11705c..f61fa249f6c069cfbc4dd1b04813d20240fcddb4 100644
--- a/bsp/thead-smart/drivers/dw_timer.h
+++ b/bsp/thead-smart/drivers/dw_timer.h
@@ -33,11 +33,11 @@ typedef struct
     __IOM uint32_t TxLoadCount;              /* Offset: 0x000 (R/W)  Receive buffer register */
     __IM  uint32_t TxCurrentValue;            /* Offset: 0x004 (R)  Transmission hold register */
     __IOM uint8_t  TxControl: 5;              /* Offset: 0x008 (R/W)  Clock frequency division low section register */
-    uint8_t  	   RESERVED0[3];
+    uint8_t        RESERVED0[3];
     __IM  uint8_t  TxEOI: 1;                   /* Offset: 0x00c (R)  Clock frequency division high section register */
-    uint8_t  	   RESERVED1[3];
+    uint8_t        RESERVED1[3];
     __IM  uint8_t  TxIntStatus: 1;             /* Offset: 0x010 (R)  Interrupt enable register */
-    uint8_t  	   RESERVED2[3];
+    uint8_t        RESERVED2[3];
 } dw_timer_reg_t;
 
 #ifdef __cplusplus
diff --git a/bsp/thead-smart/drivers/isr.c b/bsp/thead-smart/drivers/isr.c
index 1a42a81bcfdd0d0b63438f805acf49a586f8cf69..176e0d278506c4c5c1982b72b1df2432911f453f 100644
--- a/bsp/thead-smart/drivers/isr.c
+++ b/bsp/thead-smart/drivers/isr.c
@@ -25,7 +25,7 @@ extern void systick_handler(void);
 extern void xPortSysTickHandler(void);
 extern void OSTimeTick(void);
 
-#define  ATTRIBUTE_ISR
+#define  ATTRIBUTE_ISR __attribute__ ((interrupt ("machine")))
 
 #define readl(addr) \
     ({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; })
@@ -37,14 +37,14 @@ extern void OSTimeTick(void);
 #endif
 
 
-void __attribute__((isr)) SysTick_Handler(void)
+ATTRIBUTE_ISR void SysTick_Handler(void)
 {
 #if(CONFIG_KERNEL_RTTHREAD == 1)
     CSI_INTRPT_ENTER();
 #endif
 
     csi_coret_config(drv_get_sys_freq() / CONFIG_SYSTICK_HZ, CORET_IRQn);
-    
+
 #if defined(CONFIG_KERNEL_RHINO)
     systick_handler();
 #elif defined(CONFIG_KERNEL_FREERTOS)
diff --git a/bsp/thead-smart/drivers/novic_irq_tbl.c b/bsp/thead-smart/drivers/novic_irq_tbl.c
index cadfac5f9856ecc26139cf792de46281e991b4ab..25ed9181a28826a15acf8bd24cbc5cdd12abe621 100644
--- a/bsp/thead-smart/drivers/novic_irq_tbl.c
+++ b/bsp/thead-smart/drivers/novic_irq_tbl.c
@@ -22,7 +22,7 @@ void irq_vectors_init(void)
 {
     int i;
 
-    for (i = 0; i < 48; i++) 
+    for (i = 0; i < 48; i++)
     {
         g_irqvector[i] = Default_Handler;
     }
diff --git a/bsp/thead-smart/drivers/startup_gcc.S b/bsp/thead-smart/drivers/startup_gcc.S
index f71164c5993eb1fcb48bae5bb662b321cd83d685..0cd0aa6484f2f92a7139d72bf70f102f5af8a4b7 100644
--- a/bsp/thead-smart/drivers/startup_gcc.S
+++ b/bsp/thead-smart/drivers/startup_gcc.S
@@ -24,7 +24,7 @@ __Vectors:
     .long   Default_Handler
     .long   Default_Handler
     .long   Default_Handler
-    .long   Default_IRQHandler
+    .long   SysTick_Handler
     .long   Default_Handler
     .long   Default_Handler
     .long   Default_Handler
@@ -35,38 +35,39 @@ __Vectors:
     .long   Default_Handler
 
     /* External interrupts */
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
-    .long   Default_IRQHandler
+    .long   USART_IRQHandler
+    .long   Default_Handler
+    .long   TIM0_IRQHandler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .long   Default_Handler
+    .size __Vectors,.-__Vectors
 
     .text
     .align  2
diff --git a/bsp/thead-smart/drivers/system.c b/bsp/thead-smart/drivers/system.c
index 31a05f1afac68bc54abd17a4880050580d8e4d24..f860d9fee5141967d3e35c7160b0a09938ac8724 100644
--- a/bsp/thead-smart/drivers/system.c
+++ b/bsp/thead-smart/drivers/system.c
@@ -39,6 +39,23 @@ static void _system_init_for_kernel(void)
     drv_irq_enable(CORET_IRQn);
 }
 
+/**
+  * @brief  initialize system map
+  * @param  None
+  * @return None
+  */
+void systemmap_config(void)
+{
+   csi_sysmap_config_region(0, 0x20000000, SYSMAP_SYSMAPCFG_B_Msk | SYSMAP_SYSMAPCFG_C_Msk);
+   csi_sysmap_config_region(1, 0x40000000, SYSMAP_SYSMAPCFG_B_Msk | SYSMAP_SYSMAPCFG_C_Msk);
+   csi_sysmap_config_region(2, 0x50000000, SYSMAP_SYSMAPCFG_SO_Msk);
+   csi_sysmap_config_region(3, 0x50700000, SYSMAP_SYSMAPCFG_B_Msk | SYSMAP_SYSMAPCFG_C_Msk);
+   csi_sysmap_config_region(4, 0x60000000, SYSMAP_SYSMAPCFG_SO_Msk);
+   csi_sysmap_config_region(5, 0x80000000, SYSMAP_SYSMAPCFG_B_Msk | SYSMAP_SYSMAPCFG_C_Msk);
+   csi_sysmap_config_region(6, 0x90000000, SYSMAP_SYSMAPCFG_B_Msk | SYSMAP_SYSMAPCFG_C_Msk);
+   csi_sysmap_config_region(7, 0xf0000000, SYSMAP_SYSMAPCFG_SO_Msk);
+}
+
 /**
   * @brief  initialize the system
   *         Initialize the psr and vbr.
@@ -48,8 +65,9 @@ static void _system_init_for_kernel(void)
 void SystemInit(void)
 {
     int i;
+    systemmap_config();
     /* enable mstatus FS */
-#if ((CONFIG_CPU_E906F==1) || (CONFIG_CPU_E906FD==1))
+#if (__riscv_flen)
     uint32_t mstatus = __get_MSTATUS();
     mstatus |= (1 << 13);
     __set_MSTATUS(mstatus);
@@ -68,7 +86,7 @@ void SystemInit(void)
     /* get interrupt level from info */
     CLIC->CLICCFG = (((CLIC->CLICINFO & CLIC_INFO_CLICINTCTLBITS_Msk) >> CLIC_INFO_CLICINTCTLBITS_Pos) << CLIC_CLICCFG_NLBIT_Pos);
 
-    for (i = 0; i < 64; i++) 
+    for (i = 0; i < 64; i++)
     {
         CLIC->CLICINT[i].IP = 0;
         CLIC->CLICINT[i].ATTR = 1; /* use vector interrupt */
@@ -77,7 +95,9 @@ void SystemInit(void)
     /* tspend use positive interrupt */
     CLIC->CLICINT[Machine_Software_IRQn].ATTR = 0x3;
 
+#if ((CONFIG_CPU_E902 != 1) && (CONFIG_CPU_E902M != 1))
     csi_dcache_enable();
+#endif
     csi_icache_enable();
     drv_irq_enable(Machine_Software_IRQn);
 
diff --git a/bsp/thead-smart/drivers/trap_c.c b/bsp/thead-smart/drivers/trap_c.c
index b236714100b2f328ce9362e07e39e3a952a97af1..7df7cd1f9b24e575640a17bc2ece98329576adb6 100644
--- a/bsp/thead-smart/drivers/trap_c.c
+++ b/bsp/thead-smart/drivers/trap_c.c
@@ -23,24 +23,24 @@ void trap_c(uint32_t *regs)
 
     vec = __get_MCAUSE() & 0x3FF;
 
-    printf("CPU Exception: NO.%d", vec);
+    printf("CPU Exception: NO.%ld", vec);
     printf("\n");
 
-    for (i = 0; i < 31; i++) 
+    for (i = 0; i < 31; i++)
     {
-        printf("x%d: %08x\t", i + 1, regs[i]);
+        printf("x%d: %08lx\t", i + 1, regs[i]);
 
-        if ((i % 4) == 3) 
+        if ((i % 4) == 3)
         {
             printf("\n");
         }
     }
 
     printf("\n");
-    printf("mepc   : %08x\n", regs[31]);
-    printf("mstatus: %08x\n", regs[32]);
+    printf("mepc   : %08lx\n", regs[31]);
+    printf("mstatus: %08lx\n", regs[32]);
 
-    if (trap_c_callback) 
+    if (trap_c_callback)
     {
         trap_c_callback();
     }
diff --git a/bsp/thead-smart/drivers/vectors.S b/bsp/thead-smart/drivers/vectors.S
index 3bfa3c70b74ba2cbe66261281b7462c574b7dbe7..5d9de51601ac61e03202102c380143a3f2d6a3a8 100644
--- a/bsp/thead-smart/drivers/vectors.S
+++ b/bsp/thead-smart/drivers/vectors.S
@@ -10,6 +10,8 @@
 
 
 #include <csi_config.h>
+#include <rtconfig.h>
+#include <cpuport.h>
 
 /* Enable interrupts when returning from the handler */
 #define MSTATUS_PRV1 0x1880
@@ -47,7 +49,7 @@ irq_mstatus_fs_flag:
 Default_IRQHandler:
     ipush
 
-#ifdef ARCH_RISCV_FPU
+#ifdef __riscv_flen
     csrr    t1, mstatus
     srli    t1, t1, 13
     andi    t1, t1, 0x3
@@ -92,7 +94,7 @@ Default_IRQHandler:
     li      t0, MSTATUS_PRV1
     csrs    mstatus, t0
 
-#ifdef ARCH_RISCV_FPU    
+#ifdef __riscv_flen
     la      t0, irq_mstatus_fs_flag
     lw      t1, (t0)
     li      t0, 0x3
@@ -135,6 +137,7 @@ Default_IRQHandler:
     .type   trap, %function
 trap:
     /* Check for interrupt */
+    j       .
     addi    sp, sp, -4
     sw      t0, 0x0(sp)
     csrr    t0, mcause
@@ -235,7 +238,7 @@ Default_Handler:
     sw      t5, 56(sp)
     sw      t6, 60(sp)
 
-#ifdef ARCH_RISCV_FPU
+#ifdef __riscv_flen
     addi    sp,    sp, -(20*FREGBYTES)
     FSTORE  ft0,   0 * FREGBYTES(sp)
     FSTORE  ft1,   1 * FREGBYTES(sp)
@@ -263,7 +266,7 @@ Default_Handler:
     lw      t0, (t0)
     jalr    t0
 
-#ifdef ARCH_RISCV_FPU
+#ifdef __riscv_flen
     FLOAD   ft0,   0 * FREGBYTES(sp)
     FLOAD   ft1,   1 * FREGBYTES(sp)
     FLOAD   ft2,   2 * FREGBYTES(sp)
diff --git a/bsp/thead-smart/gcc_csky.ld b/bsp/thead-smart/gcc_csky.ld
index a0303d19ebd9ccfa95790796cf805c865875fa37..f7cc25e822280b17b2bd6d02d3f72df8c25df2fd 100644
--- a/bsp/thead-smart/gcc_csky.ld
+++ b/bsp/thead-smart/gcc_csky.ld
@@ -101,6 +101,7 @@ SECTIONS
   *(.rodata1)
   *(.rodata*)
   *(.rodata.*)
+  *(.srodata*)
   *(.rodata.str1.4)
   . = ALIGN(0x4) ;
   __ctor_start__ = .;
@@ -116,10 +117,10 @@ SECTIONS
  } > REGION_RODATA
  .data : {
   . = ALIGN(0x4) ;
-  __sdata = . ;
   __data_start__ = . ;
+  __sdata = . ;
   data_start = . ;
-  KEEP(*startup.o(*.vectors*))
+  KEEP(*startup_gcc.o(*.vectors*))
   *(.got.plt)
   *(.got)
   *(.gnu.linkonce.r*)
diff --git a/bsp/thead-smart/gdbinit b/bsp/thead-smart/gdbinit
new file mode 100644
index 0000000000000000000000000000000000000000..aed74eaa1dd641feb0a302834b027929df3048b8
--- /dev/null
+++ b/bsp/thead-smart/gdbinit
@@ -0,0 +1,11 @@
+target remote 172.16.201.64:1025
+set *(int *)0x0=0x6f
+si
+reset
+set *(int *)0x40011008=0x0
+set *(int *)0x4001101c=0x0
+set disassemble-next-line on
+show disassemble-next-line
+lo
+
+
diff --git a/bsp/thead-smart/rtconfig.h b/bsp/thead-smart/rtconfig.h
index 142256dab37dffa2f168290a46e791666abd6539..1f34e30fbe1ba0819702f920ff6ec137df837b9b 100644
--- a/bsp/thead-smart/rtconfig.h
+++ b/bsp/thead-smart/rtconfig.h
@@ -39,9 +39,19 @@
 #define RT_CONSOLE_DEVICE_NAME "uart1"
 #define RT_VER_NUM 0x40003
 #define ARCH_RISCV
+#define ARCH_RISCV32
+#if(__riscv_flen == 64)
+#define ARCH_RISCV_FPU
+#define ARCH_RISCV_FPU_D
+#elif(__riscv_flen == 32)
 #define ARCH_RISCV_FPU
 #define ARCH_RISCV_FPU_S
-#define ARCH_RISCV32
+#else
+#endif
+#ifdef __riscv_zp64
+#define ARCH_RISCV_DSP
+#endif
+
 
 /* RT-Thread Components */
 
diff --git a/bsp/thead-smart/rtconfig.py b/bsp/thead-smart/rtconfig.py
index be45bc8e84fe0f05e5cc620d43d610a2116b3693..95606581c862c77cac35c5309a9c999073abbf77 100644
--- a/bsp/thead-smart/rtconfig.py
+++ b/bsp/thead-smart/rtconfig.py
@@ -1,9 +1,11 @@
 import os
 
 # toolchains options
+# CPUNAME = e906/e906f/e906fd/e906p/e906fp/e906fdp
+# CPUNAME = e907/e907f/e907fd/e907p/e907fp/e907fdp
 ARCH        ='risc-v'
-CPU         ='e906'
-CPUNAME     ='e906f'
+CPU         ='e9xx'
+CPUNAME     ='e906fdp'
 VENDOR      ='t-head'
 CROSS_TOOL  ='gcc'
 
@@ -12,9 +14,9 @@ if os.getenv('RTT_CC'):
 
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = r'/home/xinge/tools/riscv64-elf-x86_64-20200616-1.9.6/bin'
+    EXEC_PATH   = r'/home/chenzx/.thead/riscv64-elf-x86_64-2.0.1/bin/'
 else:
-    print 'Please make sure your toolchains is GNU GCC!'
+    print ('Please make sure your toolchains is GNU GCC!')
     exit(0)
 
 if os.getenv('RTT_EXEC_PATH'):
@@ -37,16 +39,23 @@ if PLATFORM == 'gcc':
     OBJCPY  = PREFIX + 'objcopy'
     STRIP   = PREFIX + 'strip'
 
-    if CPUNAME == 'e906fd':
-        DEVICE = ' -march=rv32imafdcxthead -mabi=ilp32d'
-    if CPUNAME == 'e906f':
-        DEVICE = ' -march=rv32imafcxthead -mabi=ilp32f'
-    if CPUNAME == 'e906':
-        DEVICE = ' -march=rv32imacxthead -mabi=ilp32'
+
+    if CPUNAME == 'e906fdp' or CPUNAME == 'e907fdp':
+        DEVICE = ' -march=rv32imafdcpzp64_xtheade -mabi=ilp32d'
+    if CPUNAME == 'e906fp' or CPUNAME == 'e907fp':
+        DEVICE = ' -march=rv32imafcpzp64_xtheade -mabi=ilp32f'
+    if CPUNAME == 'e906p' or CPUNAME == 'e907p':
+        DEVICE = ' -march=rv32imacpzp64_xtheade -mabi=ilp32'
+    if CPUNAME == 'e906fd' or CPUNAME == 'e907fd':
+        DEVICE = ' -march=rv32imafdc_xtheade -mabi=ilp32d'
+    if CPUNAME == 'e906f' or CPUNAME == 'e907f':
+        DEVICE = ' -march=rv32imafc_xtheade -mabi=ilp32f'
+    if CPUNAME == 'e906' or CPUNAME == 'e907':
+        DEVICE = ' -march=rv32imac_xtheade -mabi=ilp32'
 
     CFLAGS  = DEVICE + ' -c -g -ffunction-sections -fdata-sections -Wall -mcmodel=medlow'
     AFLAGS  = ' -c' + DEVICE + ' -x assembler-with-cpp'
-    LFLAGS  = DEVICE + ' -nostartfiles -Wl,--no-whole-archive -T gcc_csky.ld -lm -lc -lgcc -Wl,-gc-sections -Wl,-zmax-page-size=1024'
+    LFLAGS  = DEVICE + ' -nostartfiles -Wl,--no-whole-archive -T gcc_csky.ld -lm -lc -lgcc -Wl,-gc-sections -Wl,-zmax-page-size=1024 -Wl,-Map=rtt.map'
     CPATH   = ''
     LPATH   = ''
 
diff --git a/libcpu/risc-v/SConscript b/libcpu/risc-v/SConscript
index 18b4c2005d98b3e86dbd7571cf76658dcdf23ac1..2447aee65a29e73983f5c130b2d99181d98eca3e 100644
--- a/libcpu/risc-v/SConscript
+++ b/libcpu/risc-v/SConscript
@@ -10,7 +10,7 @@ group = []
 list  = os.listdir(cwd)
 
 # add common code files
-if   rtconfig.CPU == "e906" :
+if   rtconfig.CPU == "e9xx" :
     group = group
 elif rtconfig.CPU == "nuclei" :
     group = group
@@ -20,7 +20,7 @@ else :
     group = group + SConscript(os.path.join(cwd, 'common', 'SConscript'))
 
 # cpu porting code files
-if  rtconfig.CPU == "e906" :
+if  rtconfig.CPU == "e9xx" :
     group = group + SConscript(os.path.join(cwd, rtconfig.VENDOR, rtconfig.CPU, 'SConscript'))
 else :
     group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
diff --git a/libcpu/risc-v/t-head/e906/SConscript b/libcpu/risc-v/t-head/e9xx/SConscript
similarity index 100%
rename from libcpu/risc-v/t-head/e906/SConscript
rename to libcpu/risc-v/t-head/e9xx/SConscript
diff --git a/libcpu/risc-v/t-head/e906/context_gcc.S b/libcpu/risc-v/t-head/e9xx/context_gcc.S
similarity index 96%
rename from libcpu/risc-v/t-head/e906/context_gcc.S
rename to libcpu/risc-v/t-head/e9xx/context_gcc.S
index 2f5223ae63c5064467f2f85a262c9bd8c9908b4c..9deaf80e41356b44de9cfbb2d91512617deaa116 100644
--- a/libcpu/risc-v/t-head/e906/context_gcc.S
+++ b/libcpu/risc-v/t-head/e9xx/context_gcc.S
@@ -181,7 +181,11 @@ PendSV_Handler:
     FSTORE  f31, 31 * FREGBYTES(sp)
 #endif
 
+#ifdef ARCH_RISCV_DSP
+    addi    sp, sp, -33 * REGBYTES
+#else
     addi    sp, sp, -32 * REGBYTES
+#endif
 
     STORE   x1, 1 * REGBYTES(sp)
     csrr    x1, mepc
@@ -221,6 +225,10 @@ PendSV_Handler:
     STORE   x29, 29 * REGBYTES(sp)
     STORE   x30, 30 * REGBYTES(sp)
     STORE   x31, 31 * REGBYTES(sp)
+#ifdef ARCH_RISCV_DSP
+    csrr    t0, vxsat
+    STORE   t0, 32 * REGBYTES(sp)
+#endif
 
     /* store from_thread sp */
     la      t0, rt_interrupt_from_thread
@@ -237,6 +245,12 @@ PendSV_Handler:
     lw      t0, (t0)
     LOAD    sp, (t0)
 
+
+#ifdef ARCH_RISCV_DSP
+    LOAD    a1, 32 * REGBYTES(sp)
+    csrw    vxsat, a1
+#endif
+
     /* restore ra to mepc */
     LOAD    a1, 0 * REGBYTES(sp)
     csrw    mepc, a1
@@ -277,7 +291,11 @@ PendSV_Handler:
     LOAD    x30, 30 * REGBYTES(sp)
     LOAD    x31, 31 * REGBYTES(sp)
 
+#ifdef ARCH_RISCV_DSP
+    addi    sp, sp, 33 * REGBYTES
+#else
     addi    sp, sp, 32 * REGBYTES
+#endif
 
 #ifdef ARCH_RISCV_FPU
     FLOAD   f0, 0 * FREGBYTES(sp)
diff --git a/libcpu/risc-v/t-head/e906/cpuport.c b/libcpu/risc-v/t-head/e9xx/cpuport.c
similarity index 98%
rename from libcpu/risc-v/t-head/e906/cpuport.c
rename to libcpu/risc-v/t-head/e9xx/cpuport.c
index 0eaf5ffbcef8e39dc6990f52dc2b433fe2688a4b..6fa41b6da68620591d58e54879a59e84c63e5b75 100644
--- a/libcpu/risc-v/t-head/e906/cpuport.c
+++ b/libcpu/risc-v/t-head/e9xx/cpuport.c
@@ -53,6 +53,9 @@ struct rt_hw_stack_frame
     rt_ubase_t t4;         /* x29 - t4     - temporary register 4                */
     rt_ubase_t t5;         /* x30 - t5     - temporary register 5                */
     rt_ubase_t t6;         /* x31 - t6     - temporary register 6                */
+#ifdef ARCH_RISCV_DSP
+    rt_ubase_t vxsat;      /* P-ext vxsat reg */
+#endif
 #ifdef ARCH_RISCV_FPU
     rv_floatreg_t f0;      /* f0  */
     rv_floatreg_t f1;      /* f1  */
diff --git a/libcpu/risc-v/t-head/e906/cpuport.h b/libcpu/risc-v/t-head/e9xx/cpuport.h
similarity index 100%
rename from libcpu/risc-v/t-head/e906/cpuport.h
rename to libcpu/risc-v/t-head/e9xx/cpuport.h