diff --git a/bsp/imxrt1052-evk/Libraries/drivers/fsl_enet.c b/bsp/imxrt1052-evk/Libraries/drivers/fsl_enet.c
index 0ef887400aa8a03d97c537566dbb9a5fc9be8132..a2e6990266bf663ccf63c576c00d5f24fdf5fdc6 100644
--- a/bsp/imxrt1052-evk/Libraries/drivers/fsl_enet.c
+++ b/bsp/imxrt1052-evk/Libraries/drivers/fsl_enet.c
@@ -1346,12 +1346,7 @@ status_t ENET_SendFrame(ENET_Type *base, enet_handle_t *handle, const uint8_t *d
         address = (uint32_t)curBuffDescrip->buffer;
 #endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
         
-        {
-            // Change SDK to reduce memory copy
-            extern void pbuf2mem(const uint8_t *data, void *dataptr, uint32_t len);
-            pbuf2mem(data, (void *)address, length);
-        }
-        //memcpy((void *)address, data, length);
+        memcpy((void *)address, data, length);
         /* Set data length. */
         curBuffDescrip->length = length;
 #ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
diff --git a/bsp/imxrt1052-evk/README.md b/bsp/imxrt1052-evk/README.md
index 83440420e10a9227766a0791f566c46f74412f72..4ad8fffda51a6fc51d1797ff932e37cc1046475a 100644
--- a/bsp/imxrt1052-evk/README.md
+++ b/bsp/imxrt1052-evk/README.md
@@ -27,7 +27,7 @@ i.MX RT1050板级包支持MDK5﹑IAR开发环境和GCC编译器，以下是具
 
 ### 3.1 配置工程
 
-i.MX RT1052 BSP支持多块开发板，包括官方开发板MIMXRT1050-EVK，野火的i.MX RT1052开发板。如果不是基于官方开发板，那么重新配置并生成工程：
+i.MX RT1052 BSP支持多块开发板，包括官方开发板MIMXRT1050-EVK，野火的i.MX RT1052开发板等。如果不是基于官方开发板，那么需要重新配置并生成工程：
 
 - 在bsp下打开env工具
 - 输入`menuconfig`命令，`RT1052 Board select (***)-->`选择正确的开发板。
@@ -37,15 +37,31 @@ i.MX RT1052 BSP支持多块开发板，包括官方开发板MIMXRT1050-EVK，野
 
 #### 3.2.1 MIMXRT1050-EVK
 
-EVK开发板有板载OpenSDA仿真器，仿真器还连接到i.MX RT1052的UART1。使用USB线连接电脑和仿真器的USB口(J28)，就可以进行下载和仿真。在终端工具里打开仿真器的虚拟串口就可以看到shell输出
+EVK开发板有板载OpenSDA仿真器，仿真器还连接到i.MX RT1052的UART1。使用USB线连接电脑和仿真器的USB口(J28)，就可以进行下载和仿真。在终端工具里打开仿真器的虚拟串口。
 
 #### 3.2.2 野火开发板
+连接外置仿真器（野火DAP仿真器或者Jlink）后，就可以进行下载和下载。使用USB线连接开发板底板的USB转串口，在终端工具里打开相应的串口。
 
 ### 3.3 运行结果
 
-如果编译 & 烧写无误，当复位设备后，会在串口上（PuTTY）看到RT-Thread的启动logo信息：
-
-TODO
+如果编译 & 烧写无误，当复位设备后，会在串口上看到RT-Thread的启动logo信息：
+
+```
+
+ \ | /
+- RT -     Thread Operating System
+ / | \     3.0.4 build May  2 2018
+ 2006 - 2018 Copyright by rt-thread team
+lwIP-2.0.2 initialized!
+using armcc, version: 5060750
+build time: May  2 2018 21:52:40
+msh />[PHY] wait autonegotiation complete...
+SD card capacity 123904 KB
+probe mmcsd block device!
+found part[0], begin: 32256, size: 120.992MB
+File System initialized!
+[PHY] wait autonegotiation complete...
+```
 
 ## 4. 驱动支持情况及计划
 
diff --git a/bsp/imxrt1052-evk/drivers/drv_eth.c b/bsp/imxrt1052-evk/drivers/drv_eth.c
index 812adbd7484e5e1df457c111bee7883171aff807..56570964e4f23d22191f67219d60d9f3300dcb36 100644
--- a/bsp/imxrt1052-evk/drivers/drv_eth.c
+++ b/bsp/imxrt1052-evk/drivers/drv_eth.c
@@ -23,6 +23,7 @@
 #include "fsl_gpio.h"
 #include "fsl_iomuxc.h"
 #include "fsl_phy.h"
+#include "fsl_cache.h"
 
 #ifdef RT_USING_LWIP
 
@@ -479,6 +480,188 @@ static rt_err_t rt_imxrt_eth_control(rt_device_t dev, int cmd, void *args)
     return RT_EOK;
 }
 
+static void _ENET_ActiveSend(ENET_Type *base, uint32_t ringId)
+{
+    assert(ringId < FSL_FEATURE_ENET_QUEUE);
+
+    switch (ringId)
+    {
+        case 0:
+            base->TDAR = ENET_TDAR_TDAR_MASK;
+            break;
+#if FSL_FEATURE_ENET_QUEUE > 1
+        case kENET_Ring1:
+            base->TDAR1 = ENET_TDAR1_TDAR_MASK;
+            break;
+        case kENET_Ring2:
+            base->TDAR2 = ENET_TDAR2_TDAR_MASK;
+            break;
+#endif /* FSL_FEATURE_ENET_QUEUE > 1 */
+        default:
+            base->TDAR = ENET_TDAR_TDAR_MASK;
+            break;
+    }
+}
+
+static status_t _ENET_SendFrame(ENET_Type *base, enet_handle_t *handle, const uint8_t *data, uint32_t length)
+{
+    assert(handle);
+    assert(data);
+
+    volatile enet_tx_bd_struct_t *curBuffDescrip;
+    uint32_t len = 0;
+    uint32_t sizeleft = 0;
+    uint32_t address;
+
+    /* Check the frame length. */
+    if (length > ENET_FRAME_MAX_FRAMELEN)
+    {
+        return kStatus_ENET_TxFrameOverLen;
+    }
+
+    /* Check if the transmit buffer is ready. */
+    curBuffDescrip = handle->txBdCurrent[0];
+    if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_READY_MASK)
+    {
+        return kStatus_ENET_TxFrameBusy;
+    }
+#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
+    bool isPtpEventMessage = false;
+    /* Check PTP message with the PTP header. */
+    isPtpEventMessage = ENET_Ptp1588ParseFrame(data, NULL, true);
+#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
+    /* One transmit buffer is enough for one frame. */
+    if (handle->txBuffSizeAlign[0] >= length)
+    {
+        /* Copy data to the buffer for uDMA transfer. */
+#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
+        address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer,kMEMORY_DMA2Local);
+#else
+        address = (uint32_t)curBuffDescrip->buffer;
+#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
+
+        pbuf_copy_partial((const struct pbuf *)data, (void *)address, length, 0);
+            
+        /* Set data length. */
+        curBuffDescrip->length = length;
+#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
+        /* For enable the timestamp. */
+        if (isPtpEventMessage)
+        {
+            curBuffDescrip->controlExtend1 |= ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
+        }
+        else
+        {
+            curBuffDescrip->controlExtend1 &= ~ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
+        }
+
+#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
+        curBuffDescrip->control |= (ENET_BUFFDESCRIPTOR_TX_READY_MASK | ENET_BUFFDESCRIPTOR_TX_LAST_MASK);
+
+        /* Increase the buffer descriptor address. */
+        if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_WRAP_MASK)
+        {
+            handle->txBdCurrent[0] = handle->txBdBase[0];
+        }
+        else
+        {
+            handle->txBdCurrent[0]++;
+        }
+#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
+        /* Add the cache clean maintain. */
+#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
+        address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer,kMEMORY_DMA2Local);
+#else
+        address = (uint32_t)curBuffDescrip->buffer;
+#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
+        DCACHE_CleanByRange(address, length);
+#endif  /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */
+        /* Active the transmit buffer descriptor. */
+        _ENET_ActiveSend(base, 0);
+
+        return kStatus_Success;
+    }
+    else
+    {
+        /* One frame requires more than one transmit buffers. */
+        do
+        {
+#ifdef ENET_ENHANCEDBUFFERDESCRIPTOR_MODE
+            /* For enable the timestamp. */
+            if (isPtpEventMessage)
+            {
+                curBuffDescrip->controlExtend1 |= ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
+            }
+            else
+            {
+                curBuffDescrip->controlExtend1 &= ~ENET_BUFFDESCRIPTOR_TX_TIMESTAMP_MASK;
+            }
+#endif /* ENET_ENHANCEDBUFFERDESCRIPTOR_MODE */
+
+            /* Increase the buffer descriptor address. */
+            if (curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_WRAP_MASK)
+            {
+                handle->txBdCurrent[0] = handle->txBdBase[0];
+            }
+            else
+            {
+                handle->txBdCurrent[0]++;
+            }
+            /* update the size left to be transmit. */
+            sizeleft = length - len;
+            if (sizeleft > handle->txBuffSizeAlign[0])
+            {
+                /* Data copy. */
+#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
+                address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer,kMEMORY_DMA2Local);
+#else
+                address = (uint32_t)curBuffDescrip->buffer;
+#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
+                memcpy((void *)address, data + len, handle->txBuffSizeAlign[0]);
+                /* Data length update. */
+                curBuffDescrip->length = handle->txBuffSizeAlign[0];
+                len += handle->txBuffSizeAlign[0];
+                /* Sets the control flag. */
+                curBuffDescrip->control &= ~ENET_BUFFDESCRIPTOR_TX_LAST_MASK;
+                curBuffDescrip->control |= ENET_BUFFDESCRIPTOR_TX_READY_MASK;
+                /* Active the transmit buffer descriptor*/
+                _ENET_ActiveSend(base, 0);
+            }
+            else
+            {
+#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
+                address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer,kMEMORY_DMA2Local);
+#else
+                address = (uint32_t)curBuffDescrip->buffer;
+#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
+                memcpy((void *)address, data + len, sizeleft);
+                curBuffDescrip->length = sizeleft;
+                /* Set Last buffer wrap flag. */
+                curBuffDescrip->control |= ENET_BUFFDESCRIPTOR_TX_READY_MASK | ENET_BUFFDESCRIPTOR_TX_LAST_MASK;
+#if defined(FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL) && FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL
+                /* Add the cache clean maintain. */
+#if defined(FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET) && FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET
+                address = MEMORY_ConvertMemoryMapAddress((uint32_t)curBuffDescrip->buffer,kMEMORY_DMA2Local);
+#else
+                address = (uint32_t)curBuffDescrip->buffer;
+#endif /* FSL_FEATURE_MEMORY_HAS_ADDRESS_OFFSET */
+                DCACHE_CleanByRange(address, handle->txBuffSizeAlign[0]);
+#endif  /* FSL_SDK_ENABLE_DRIVER_CACHE_CONTROL */                 
+                /* Active the transmit buffer descriptor. */
+                _ENET_ActiveSend(base, 0);
+
+                return kStatus_Success;
+            }
+
+            /* Get the current buffer descriptor address. */
+            curBuffDescrip = handle->txBdCurrent[0];
+
+        } while (!(curBuffDescrip->control & ENET_BUFFDESCRIPTOR_TX_READY_MASK));
+
+        return kStatus_ENET_TxFrameBusy;
+    }
+}
+
 /* ethernet device interface */
 /* transmit packet. */
 rt_err_t rt_imxrt_eth_tx(rt_device_t dev, struct pbuf *p)
@@ -497,7 +680,7 @@ rt_err_t rt_imxrt_eth_tx(rt_device_t dev, struct pbuf *p)
 
     do
     {
-        result = ENET_SendFrame(imxrt_eth_device.enet_base, enet_handle, (const uint8_t *)p, p->tot_len);
+        result = _ENET_SendFrame(imxrt_eth_device.enet_base, enet_handle, (const uint8_t *)p, p->tot_len);
 
         if (result == kStatus_ENET_TxFrameBusy)
         {
@@ -511,11 +694,6 @@ rt_err_t rt_imxrt_eth_tx(rt_device_t dev, struct pbuf *p)
     return RT_EOK;
 }
 
-void pbuf2mem(const uint8_t *data, void *dataptr, uint32_t len)
-{
-    pbuf_copy_partial((const struct pbuf *)data, dataptr, len, 0);
-}
-
 /* reception packet. */
 struct pbuf *rt_imxrt_eth_rx(rt_device_t dev)
 {
diff --git a/bsp/imxrt1052-evk/drivers/drv_sdio.c b/bsp/imxrt1052-evk/drivers/drv_sdio.c
index 5538e5c9c7faf92d8c1abfa1d3e5e82072ee5c6f..787e004d6b0d96fb398681872b212560078c1f71 100644
--- a/bsp/imxrt1052-evk/drivers/drv_sdio.c
+++ b/bsp/imxrt1052-evk/drivers/drv_sdio.c
@@ -56,7 +56,7 @@ static int enable_log = 1;
 
 #define USDHC_ADMA_TABLE_WORDS      (8U)        /* define the ADMA descriptor table length */
 #define USDHC_ADMA2_ADDR_ALIGN      (4U)        /* define the ADMA2 descriptor table addr align size */
-#define IMXRT_MAX_FREQ              (50UL * 1000UL * 1000UL)
+#define IMXRT_MAX_FREQ              (25UL * 1000UL * 1000UL)
     
 #define USDHC_ADMA_TABLE_WORDS      (8U)        /* define the ADMA descriptor table length */
 #define USDHC_ADMA2_ADDR_ALIGN      (4U)        /* define the ADMA2 descriptor table addr align size */