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未验证 提交 1ad1bd3c 编写于 作者: B Bernard Xiong 提交者： GitHub
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Merge pull request #1457 from zhuangwei123/master 

[bsp/ls1cdev]添加自引导特性，添加配置选项
上级 9aba5dd6 330bdf69
隐藏空白更改
内联 并排
Showing with 666 addition and 135 deletion
bsp/ls1cdev/.config
浏览文件 @ 1ad1bd3c
......@@ -228,20 +228,6 @@ CONFIG_LWIP_NETIF_LOOPBACK=0
# RT-Thread online packages
#
#
# system packages
#
#
# RT-Thread GUI Engine
#
# CONFIG_PKG_USING_GUIENGINE is not set
# CONFIG_PKG_USING_LVGL is not set
# CONFIG_PKG_USING_LWEXT4 is not set
# CONFIG_PKG_USING_PARTITION is not set
# CONFIG_PKG_USING_SQLITE is not set
# CONFIG_PKG_USING_RTI is not set
#
# IoT - internet of things
#
......@@ -271,6 +257,7 @@ CONFIG_LWIP_NETIF_LOOPBACK=0
# CONFIG_PKG_USING_COAP is not set
# CONFIG_PKG_USING_NOPOLL is not set
# CONFIG_PKG_USING_NETUTILS is not set
# CONFIG_PKG_USING_ONENET is not set
#
# security packages
......@@ -289,6 +276,7 @@ CONFIG_LWIP_NETIF_LOOPBACK=0
# multimedia packages
#
# CONFIG_PKG_USING_OPENMV is not set
# CONFIG_PKG_USING_MUPDF is not set
#
# tools packages
......@@ -299,6 +287,26 @@ CONFIG_LWIP_NETIF_LOOPBACK=0
# CONFIG_PKG_USING_SYSTEMVIEW is not set
# CONFIG_PKG_USING_IPERF is not set
#
# system packages
#
#
# RT-Thread GUI Engine
#
# CONFIG_PKG_USING_GUIENGINE is not set
# CONFIG_PKG_USING_LWEXT4 is not set
# CONFIG_PKG_USING_PARTITION is not set
# CONFIG_PKG_USING_SQLITE is not set
# CONFIG_PKG_USING_RTI is not set
# CONFIG_PKG_USING_LITTLEVGL2RTT is not set
#
# peripheral libraries and drivers
#
# CONFIG_PKG_USING_STM32F4_HAL is not set
# CONFIG_PKG_USING_STM32F4_DRIVERS is not set
#
# miscellaneous packages
#
......@@ -306,13 +314,18 @@ CONFIG_LWIP_NETIF_LOOPBACK=0
# CONFIG_PKG_USING_MINILZO is not set
# CONFIG_PKG_USING_QUICKLZ is not set
# CONFIG_PKG_USING_MULTIBUTTON is not set
# CONFIG_PKG_USING_SAMPLES is not set
# CONFIG_PKG_USING_CANFESTIVAL is not set
#
# sample package
#
# CONFIG_PKG_USING_SAMPLES is not set
#
# example package: hello
#
# CONFIG_PKG_USING_HELLO is not set
# CONFIG_RT_USING_SELF_BOOT is not set
CONFIG_RT_USING_UART2=y
CONFIG_RT_UART_RX_BUFFER_SIZE=64
CONFIG_RT_USING_GMAC_INT_MODE=y
......
bsp/ls1cdev/SConstruct
浏览文件 @ 1ad1bd3c
......@@ -12,6 +12,8 @@ from building import *
TARGET = 'rtthread.' + rtconfig.TARGET_EXT
rtconfig.AFLAGS += ' -I' + str(Dir('#'))
env = Environment(tools = ['mingw'],
AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
......@@ -24,6 +26,13 @@ Export('rtconfig')
# prepare building environment
objs = PrepareBuilding(env, RTT_ROOT)
if GetDepend('RT_USING_SELF_BOOT'):
rtconfig.LFLAGS += " -Ttext 0x80010000"
else:
rtconfig.LFLAGS += " -Ttext 0x80200000"
env.Replace(LINKFLAGS = rtconfig.LFLAGS)
if GetDepend('RT_USING_RTGUI'):
objs = objs + SConscript(RTT_ROOT + '/examples/gui/SConscript', variant_dir='build/examples/gui', duplicate=0)
......
bsp/ls1cdev/drivers/board.c
浏览文件 @ 1ad1bd3c
......@@ -100,6 +100,9 @@ void rt_hw_board_init(void)
/* init hardware interrupt */
rt_hw_interrupt_init();
/* clear bev */
write_c0_status(read_c0_status()&(~(1<<22)));
/* copy vector */
rt_memcpy((void *)A_K0BASE, tlb_refill_exception, 0x80);
rt_memcpy((void *)(A_K0BASE + 0x180), general_exception, 0x80);
......@@ -109,7 +112,7 @@ void rt_hw_board_init(void)
invalidate_icache_all();
#ifdef RT_USING_HEAP
rt_system_heap_init((void*)&__bss_end, (void*)RT_HW_HEAP_END);
rt_system_heap_init((void*)&__bss_end, (void*)RT_HW_HEAP_END);
#endif
#ifdef RT_USING_SERIAL
......
bsp/ls1cdev/drivers/net/synopGMAC.c
浏览文件 @ 1ad1bd3c
......@@ -31,6 +31,8 @@
#include "mii.c"
#include "synopGMAC_debug.h"
#include <ls1c.h>
#include "ls1c_pin.h"
#define RMII
#define Gmac_base 0xbfe10000
......@@ -865,10 +867,22 @@ int rt_hw_eth_init(void)
u64 base_addr = Gmac_base;
struct synopGMACNetworkAdapter * synopGMACadapter;
static u8 mac_addr0[6] = DEFAULT_MAC_ADDRESS;
int index;
rt_sem_init(&sem_ack, "tx_ack", 1, RT_IPC_FLAG_FIFO);
rt_sem_init(&sem_lock, "eth_lock", 1, RT_IPC_FLAG_FIFO);
for(index=21; index<=30;index++)
{
pin_set_purpose(index, PIN_PURPOSE_OTHER);
pin_set_remap(index, PIN_REMAP_DEFAULT);
}
pin_set_purpose(35, PIN_PURPOSE_OTHER);
pin_set_remap(35, PIN_REMAP_DEFAULT);
*((volatile unsigned int *)0xbfd00424) &= ~(7 << 28);
*((volatile unsigned int *)0xbfd00424) |= (1 << 30); //wl rmii
memset(&eth_dev, 0, sizeof(eth_dev));
synopGMACadapter = (struct synopGMACNetworkAdapter * )plat_alloc_memory(sizeof (struct synopGMACNetworkAdapter));
......
bsp/ls1cdev/kconfig
浏览文件 @ 1ad1bd3c
......@@ -19,6 +19,10 @@ config $PKGS_DIR
source "$RTT_DIR/Kconfig"
source "$PKGS_DIR/Kconfig"
config RT_USING_SELF_BOOT
bool "Enable RT-Thread run without bootloader"
default n
if RT_USING_SERIAL
config RT_USING_UART2
bool "Using RT_USING_UART2"
......
bsp/ls1cdev/libraries/ls1c_pin.c
浏览文件 @ 1ad1bd3c
// 引脚功能(普通gpio，pwm，复用等)相关接口
// 引脚功能(普通gpio，pwm，复用等)相关接口
#include "ls1c_public.h"
......@@ -8,21 +8,21 @@
/*
* 把指定pin设置为指定用途(普通gpio，非gpio)
* @gpio gpio引脚编号
* @purpose 用途
* 把指定pin设置为指定用途(普通gpio，非gpio)
* @gpio gpio引脚编号
* @purpose 用途
*/
void pin_set_purpose(unsigned int gpio, pin_purpose_t purpose)
{
volatile unsigned int *gpio_cfgx; // GPIO_CFGx寄存器
volatile unsigned int *gpio_cfgx; // GPIO_CFGx寄存器
unsigned int pin = GPIO_GET_PIN(gpio);
gpio_cfgx = gpio_get_cfg_reg(gpio);
if (PIN_PURPOSE_GPIO == purpose) // 引脚用作普通gpio
if (PIN_PURPOSE_GPIO == purpose) // 引脚用作普通gpio
{
reg_set_one_bit(gpio_cfgx, pin);
}
else // 引脚用作其它功能(非gpio)
else // 引脚用作其它功能(非gpio)
{
reg_clr_one_bit(gpio_cfgx, pin);
}
......@@ -33,116 +33,118 @@ void pin_set_purpose(unsigned int gpio, pin_purpose_t purpose)
/*
* 设置指定pin为第n复用
* @gpio gpio编号
* @remap 第n复用
* 设置指定pin为第n复用
* @gpio gpio编号
* @remap 第n复用
*/
void pin_set_remap(unsigned int gpio, pin_remap_t remap)
{
volatile unsigned int *reg = NULL; // 复用寄存器
volatile unsigned int *reg = NULL; // 复用寄存器
unsigned int port = GPIO_GET_PORT(gpio);
unsigned int pin = GPIO_GET_PIN(gpio);
int i;
int i;
/*指定全部pin复用为0*/
for(i =0; i <=4; i++)
{
reg = (volatile unsigned int *)((LS1C_CBUS_FIRST0)+((port)*0x04)+((i)*0x10));
// 置0
reg_clr_one_bit(reg, pin);
}
/*指定全部pin复用为0*/
for (i = 0; i <= 4; i++)
{
reg = (volatile unsigned int *)((LS1C_CBUS_FIRST0) + ((port) * 0x04) + ((i) * 0x10));
// 置0
reg_clr_one_bit(reg, pin);
}
if (remap == PIN_REMAP_DEFAULT) return;
switch (port)
{
case 0:
switch (remap)
{
case PIN_REMAP_FIRST:
reg = (volatile unsigned int *)LS1C_CBUS_FIRST0;
break;
case PIN_REMAP_SECOND:
reg = (volatile unsigned int *)LS1C_CBUS_SECOND0;
break;
case PIN_REMAP_THIRD:
reg = (volatile unsigned int *)LS1C_CBUS_THIRD0;
break;
case PIN_REMAP_FOURTH:
reg = (volatile unsigned int *)LS1C_CBUS_FOURTH0;
break;
case PIN_REMAP_FIFTH:
reg = (volatile unsigned int *)LS1C_CBUS_FIFTH0;
break;
}
break;
case 1:
switch (remap)
{
case PIN_REMAP_FIRST:
reg = (volatile unsigned int *)LS1C_CBUS_FIRST1;
break;
case PIN_REMAP_SECOND:
reg = (volatile unsigned int *)LS1C_CBUS_SECOND1;
break;
case PIN_REMAP_THIRD:
reg = (volatile unsigned int *)LS1C_CBUS_THIRD1;
break;
case PIN_REMAP_FOURTH:
reg = (volatile unsigned int *)LS1C_CBUS_FOURTH1;
break;
case PIN_REMAP_FIFTH:
reg = (volatile unsigned int *)LS1C_CBUS_FIFTH1;
break;
}
break;
case 2:
switch (remap)
{
case PIN_REMAP_FIRST:
reg = (volatile unsigned int *)LS1C_CBUS_FIRST2;
break;
case PIN_REMAP_SECOND:
reg = (volatile unsigned int *)LS1C_CBUS_SECOND2;
break;
case PIN_REMAP_THIRD:
reg = (volatile unsigned int *)LS1C_CBUS_THIRD2;
break;
case PIN_REMAP_FOURTH:
reg = (volatile unsigned int *)LS1C_CBUS_FOURTH2;
break;
case PIN_REMAP_FIFTH:
reg = (volatile unsigned int *)LS1C_CBUS_FIFTH2;
break;
}
break;
case 3:
switch (remap)
{
case PIN_REMAP_FIRST:
reg = (volatile unsigned int *)LS1C_CBUS_FIRST3;
break;
case PIN_REMAP_SECOND:
reg = (volatile unsigned int *)LS1C_CBUS_SECOND3;
break;
case PIN_REMAP_THIRD:
reg = (volatile unsigned int *)LS1C_CBUS_THIRD3;
break;
case PIN_REMAP_FOURTH:
reg = (volatile unsigned int *)LS1C_CBUS_FOURTH3;
break;
case PIN_REMAP_FIFTH:
reg = (volatile unsigned int *)LS1C_CBUS_FIFTH3;
break;
}
break;
default:
return ;
case 0:
switch (remap)
{
case PIN_REMAP_FIRST:
reg = (volatile unsigned int *)LS1C_CBUS_FIRST0;
break;
case PIN_REMAP_SECOND:
reg = (volatile unsigned int *)LS1C_CBUS_SECOND0;
break;
case PIN_REMAP_THIRD:
reg = (volatile unsigned int *)LS1C_CBUS_THIRD0;
break;
case PIN_REMAP_FOURTH:
reg = (volatile unsigned int *)LS1C_CBUS_FOURTH0;
break;
case PIN_REMAP_FIFTH:
reg = (volatile unsigned int *)LS1C_CBUS_FIFTH0;
break;
}
break;
case 1:
switch (remap)
{
case PIN_REMAP_FIRST:
reg = (volatile unsigned int *)LS1C_CBUS_FIRST1;
break;
case PIN_REMAP_SECOND:
reg = (volatile unsigned int *)LS1C_CBUS_SECOND1;
break;
case PIN_REMAP_THIRD:
reg = (volatile unsigned int *)LS1C_CBUS_THIRD1;
break;
case PIN_REMAP_FOURTH:
reg = (volatile unsigned int *)LS1C_CBUS_FOURTH1;
break;
case PIN_REMAP_FIFTH:
reg = (volatile unsigned int *)LS1C_CBUS_FIFTH1;
break;
}
break;
case 2:
switch (remap)
{
case PIN_REMAP_FIRST:
reg = (volatile unsigned int *)LS1C_CBUS_FIRST2;
break;
case PIN_REMAP_SECOND:
reg = (volatile unsigned int *)LS1C_CBUS_SECOND2;
break;
case PIN_REMAP_THIRD:
reg = (volatile unsigned int *)LS1C_CBUS_THIRD2;
break;
case PIN_REMAP_FOURTH:
reg = (volatile unsigned int *)LS1C_CBUS_FOURTH2;
break;
case PIN_REMAP_FIFTH:
reg = (volatile unsigned int *)LS1C_CBUS_FIFTH2;
break;
}
break;
case 3:
switch (remap)
{
case PIN_REMAP_FIRST:
reg = (volatile unsigned int *)LS1C_CBUS_FIRST3;
break;
case PIN_REMAP_SECOND:
reg = (volatile unsigned int *)LS1C_CBUS_SECOND3;
break;
case PIN_REMAP_THIRD:
reg = (volatile unsigned int *)LS1C_CBUS_THIRD3;
break;
case PIN_REMAP_FOURTH:
reg = (volatile unsigned int *)LS1C_CBUS_FOURTH3;
break;
case PIN_REMAP_FIFTH:
reg = (volatile unsigned int *)LS1C_CBUS_FIFTH3;
break;
}
break;
default:
return ;
}
// 置1
// 置1
reg_set_one_bit(reg, pin);
return ;
......
bsp/ls1cdev/ls1c_ram.lds
浏览文件 @ 1ad1bd3c
......@@ -11,6 +11,7 @@
* Date Author Notes
* 2010-05-17 swkyer first version
* 2010-09-04 bernard move the beginning entry to 0x80200000
* 2018-05-12 zhuangwei use -Ttext
*/
OUTPUT_ARCH(mips)
......@@ -19,16 +20,13 @@ GROUP(-lgcc -lc)
ENTRY(_start)
SECTIONS
{
. = 0x80200000 ;
.start :
{
*(.start);
}
. = 0x80000000 ;
. = ALIGN(4);
.text :
{
start = ABSOLUTE(.);
*(.start);
*(.text)
*(.text.*)
*(.rodata)
......
bsp/ls1cdev/rtconfig.h
浏览文件 @ 1ad1bd3c
......@@ -156,11 +156,6 @@
/* RT-Thread online packages */
/* system packages */
/* RT-Thread GUI Engine */
/* IoT - internet of things */
......@@ -184,9 +179,20 @@
/* tools packages */
/* system packages */
/* RT-Thread GUI Engine */
/* peripheral libraries and drivers */
/* miscellaneous packages */
/* sample package */
/* example package: hello */
#define RT_USING_UART2
......
libcpu/mips/loongson_1c/cpuport.c
浏览文件 @ 1ad1bd3c
......@@ -17,6 +17,8 @@
#include <rtthread.h>
#include "ls1c.h"
register rt_uint32_t $GP __asm__ ("$28");
/**
* @addtogroup Loongson LS1B
*/
......@@ -68,12 +70,15 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_ad
{
rt_uint32_t *stk;
static rt_uint32_t g_sr = 0;
static rt_uint32_t g_gp = 0;
if (g_sr == 0)
{
g_sr = cp0_get_status();
g_sr &= 0xfffffffe;
g_sr |= 0x8401;
g_gp = $GP;
}
/** Start at stack top */
......@@ -87,7 +92,7 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_ad
*(--stk) = (rt_uint32_t) texit; /* ra */
*(--stk) = (rt_uint32_t) 0x0000001e; /* s8 */
*(--stk) = (rt_uint32_t) stack_addr; /* sp */
*(--stk) = (rt_uint32_t) 0x0000001c; /* gp */
*(--stk) = (rt_uint32_t) g_gp; /* gp */
*(--stk) = (rt_uint32_t) 0x0000001b; /* k1 */
*(--stk) = (rt_uint32_t) 0x0000001a; /* k0 */
*(--stk) = (rt_uint32_t) 0x00000019; /* t9 */
......
libcpu/mips/loongson_1c/sdram_cfg.h 0 → 100644
浏览文件 @ 1ad1bd3c
#ifndef __OPENLOONGSON_SDRAM_CFG_H
#define __OPENLOONGSON_SDRAM_CFG_H
//#define SD_FREQ (6 * PLL_M) / (2 * SDRAM_PARAM_DIV_NUM)
#define SD_FREQ (((APB_CLK / 4) * (PLL_MULT / CPU_DIV)) / SDRAM_PARAM_DIV_NUM)
/* 颗粒行数 */
#define ROW_1K 0x7
#define ROW_2K 0x0
#define ROW_4K 0x1
#define ROW_8K 0x2
#define ROW_16K 0x3
/* 颗粒列数 */
#define COL_256 0x7
#define COL_512 0x0
#define COL_1K 0x1
#define COL_2K 0x2
#define COL_4K 0x3
/* 颗粒位宽 */
#define WIDTH_8 0x0
#define WIDTH_16 0x1
#define WIDTH_32 0x2
#define TRCD 3
#define TCL 3
#define TRP 3
#define TRFC 8
#define TRAS 6
#define TREF 0x818
#define TWR 2
#define DEF_SEL 0x1
#define DEF_SEL_N 0x0
#define HANG_UP 0x1
#define HANG_UP_N 0x0
#define CFG_VALID 0x1
#if 0
// 白菜板8MB
/*
以型号为IS42S16400的SDRAM为例，
物理参数为，
容量：8MB
位宽：16位
列宽：8位，即2的8次方，即256
行宽：12位，即2的12次方，即4K
所以，
颗粒的位宽=WIDTH_16
颗粒的列数=COL_256
颗粒的行数=ROW_4K
再结合宏SD_PARA0和芯片手册中寄存器SD_CONFIG，相信一看就能明白
替换宏SD_PARA0中的行宽、列宽和位宽
*/
#define SDRAM_WIDTH (WIDTH_16)
#define SDRAM_COL (COL_256)
#define SDRAM_ROW (ROW_4K)
#else
// 智龙32MByte
#define SDRAM_WIDTH (WIDTH_16)
#define SDRAM_COL (COL_512)
#define SDRAM_ROW (ROW_8K)
#endif
#define SD_PARA0 (0x7f<<25 | \
(TRAS << 21) | \
(TRFC << 17) | (TRP << 14) | (TCL << 11) | \
(TRCD << 8) | (SDRAM_WIDTH << 6) | (SDRAM_COL << 3) | \
SDRAM_ROW)
#define SD_PARA1 ((HANG_UP_N << 8) | (DEF_SEL_N << 7) | (TWR << 5) | (TREF >> 7))
#define SD_PARA1_EN ((CFG_VALID << 9) | (HANG_UP_N << 8) | \
(DEF_SEL_N << 7) | (TWR << 5) | (TREF >> 7))
#endif
libcpu/mips/loongson_1c/start_gcc.S
浏览文件 @ 1ad1bd3c
......@@ -15,6 +15,34 @@
#include "../common/mips.inc"
#include "../common/stackframe.h"
#include "sdram_cfg.h"
#include "cache.h"
#include "rtconfig.h"
#define SR_BOOT_EXC_VEC 0x00400000
/* config pll div for cpu and sdram */
#define PLL_MULT (0x54) // 晶振为24Mhz时，PLL=504Mhz
#define SDRAM_DIV (0) // SDRAM为CPU的2分频
#define CPU_DIV (2) // CPU为PLL的2分频
// 配置内存大小
#define MEM_SIZE (0x02000000) // 32MByte
/* Delay macro */
#define DELAY(count) \
li v0, count; \
99: \
bnez v0, 99b;\
addiu v0, -1
#define msize s2
#define output_en s3
.section ".start", "ax"
.set noreorder
......@@ -25,6 +53,8 @@ _start:
.set noreorder
la ra, _start
#if !defined(RT_USING_SELF_BOOT)
/* disable interrupt */
mfc0 t0, CP0_STATUS
and t0, 0xfffffffe # By default it will be disabled.
......@@ -57,6 +87,46 @@ _clr_bss_loop:
/* restart, never die */
j _start
nop
#else
mtc0 zero, CP0_STATUS // 清零cp0 status寄存器
mtc0 zero, CP0_CAUSE // 清零cp0 cause寄存器
/*
设置启动异常向量入口地址为ROM地址(0xbfc00000)
将寄存器cp0 status的BEV置1，使CPU采用ROM(kseg1)空间的异常入口点
*/
li t0, SR_BOOT_EXC_VEC /* Exception to Boostrap Location */
mtc0 t0, CP0_STATUS
/* setup stack pointer */
li sp, SYSTEM_STACK
la gp, _gp
/* initialize spi */
li t0, 0xbfe80000 //地址0xbfe80000为SPI0的寄存器基地址
li t1, 0x17 // div 4, fast_read + burst_en + memory_en double I/O 模式 部分SPI flash可能不支持
sb t1, 0x4(t0) // 设置寄存器sfc_param
li t1, 0x05
sb t1, 0x6(t0) // 设置寄存器sfc_timing
/* 设置sdram cs1复用关系，开发板使用ejtag_sel gpio_0引脚(第五复用)作为第二片sdram的片选
注意sw2拨码开关的设置，使用ejtag烧录pmon时需要调整拨码开关，烧录完再调整回来 */
li a0, 0xbfd011c0
lw a1, 0x40(a0)
ori a1, 0x01
sw a1, 0x40(a0)
bal locate
nop
/* restart, never die */
j _start
nop
#endif
.set reorder
.globl cp0_get_cause
......@@ -83,6 +153,328 @@ cp0_get_lo:
jr ra
nop
#if defined(RT_USING_SELF_BOOT)
/****************************************LOCATE*********************************/
/*
* We get here from executing a bal to get the PC value of the current execute
* location into ra. Check to see if we run from ROM or if this is ramloaded.
* 寄存器ra内保持着函数的返回地址，根据ra的值来判断当前是从ROM冷启动，还是从RAM热复位的
* ROM冷启动由通电引起，RAM热复位为各种异常引起，比如看门狗引起的复位等，
* 也就是RAM热复位之前CPU已经开始运行了
* 如果是从ROM冷启动，则寄存器ra的值为指令"bal locate"所在位置加8字节，大概在0xBFC00000附近
* 如果是从RAM热复位，则集成器ra的值为0x80xxxxxx
*/
locate:
// la s0, uncached
// subu s0, ra, s0
/*
* start.s的这段汇编程序在ROM（入口点为0xBFC00000）中运行
* 而编译链接时指定的起始地址是0x80100000，所以需要修正一下地址
* s0中保存着ra与start的差值，在后续的代码中可以起到修正地址的作用
* 在看看文件开始的时候，对寄存器s0用途的描述是“ link versus load offset, used to relocate absolute adresses”
* 除了修正地址外，还通过s0的值来判断是从ROM冷启动，还是从RAM热启动
*/
la s0, _start // s0 = _start， 其中start的地址为编译链接时，指定的0x80010000
subu s0, ra, s0 // s0 = ra - s0，其中ra的值在ROM入口地址0xBFC00000附近
and s0, 0xffff0000 // s0 = s0 & 0xffff0000
/*
* 初始化cp0的status寄存器和cause寄存器
* 在异常引起的(从RAM)热复位后，需要重新初始化cp0的status和cause，
* 如果是从ROM冷启动的，那么前面已经初始化了，这里是再次重复初始化，没有影响的
*/
li t0, SR_BOOT_EXC_VEC
mtc0 t0, CP0_CONFIG // 重新初始化cp0的status寄存器
mtc0 zero, CP0_CAUSE // 重新清零cp0的cause寄存器
.set noreorder
li t0, 0xbfe78030 // 地址0xbfe78030为PLL/SDRAM频率配置寄存器的地址
/* 设置PLL倍频 及SDRAM分频 */
li t2, (0x80000008 | (PLL_MULT << 8) | (0x3 << 2) | SDRAM_DIV)
/* 设置CPU分频 */
li t3, (0x00008003 | (CPU_DIV << 8))
/* 注意：首先需要把分频使能位清零 */
li t1, 0x2
sw t1, 0x4(t0) // 清零CPU_DIV_VALID，即disable
sw t2, 0x0(t0) // 写寄存器START_FREQ
sw t3, 0x4(t0) // 写寄存器CLK_DIV_PARAM
DELAY(2000)
/* 芯片上电默认使用gpio(输入模式）但大多时候是使用模块的功能，如lcd i2c spi ac97等
所以这里把gpio都关闭，方便使用模块功能。如果上电后需要gpio输出一个确定电平，
如继电器、LDE等，可以修改这里的代码。*/
/* disable all gpio */
li a0,0xbfd00000
sw zero,0x10c0(a0) /* disable gpio 0-31 */
sw zero,0x10c4(a0) /* disable gpio 32-63 */
sw zero,0x10c8(a0) /* disable gpio 64-95 */
sw zero,0x10cc(a0)
li t0, 0xffffffff
sw t0, 0x10d0(a0)
sw t0, 0x10d4(a0)
sw t0, 0x10d8(a0)
sw t0, 0x10dc(a0)
sw t0, 0x10f0(a0)
sw t0, 0x10f4(a0)
sw t0, 0x10f8(a0)
sw t0, 0x10fc(a0)
/* lcd soft_reset and panel config & timing */
#ifdef DC_FB0
/* li a0, 0xbc301240
li a1, 0x00100103
sw a1, 0x0(a0)
li a1, 0x00000103
sw a1, 0x0(a0) //soft_reset
li a1, 0x00100103
sw a1, 0x0(a0)
li a1, 0x80001111
sw a1, 0x180(a0) //panel config
li a1, 0x33333333
sw a1, 0x1a0(a0)*/
#endif
li output_en, 0x1
#ifdef FAST_STARTUP
li a1, 0x03000000
sw a1, 0x10c4(a0)
sw a1, 0x10d4(a0)
lw a2, 0x10e4(a0)
and a2, a1
beq a2, a1, get_pin_val_finish
nop
li output_en, 0x1
get_pin_val_finish:
#endif
/* Initializing. Standby... */
/*
* 根据s0的值判断是否为ROM冷启动
* 如果s0不等于0，则是ROM冷启动；如果等于0，则是RAM热复位
* 冷启动，则需要初始化内存，cache，加载代码到内存等
*/
bnez s0, 1f // 如果寄存器s0不等于0，则说明是ROM冷启动，则跳转到下一个标号1处进行彻底初始化
nop
li a0, 128
jal rtthread_startup // 热复位，则直接跳转到函数main
nop
1:
/* use only 8wins */
#define CPU_WIN_BASE 0xbfd00000
#define CPU_WIN_MASK 0xbfd00040
#define CPU_WIN_MMAP 0xbfd00080
#define set_cpu_window(id, base, mask, mmap) \
li t0, CPU_WIN_BASE ; \
sw $0, 0x80+id*8(t0) ; \
li t1, base ; \
sw t1, 0x00+id*8(t0) ; \
sw $0, 0x04+id*8(t0) ; \
li t1, mask ; \
sw t1, 0x40+id*8(t0) ; \
sw $0, 0x44+id*8(t0) ; \
li t1, mmap ; \
sw t1, 0x80+id*8(t0) ; \
sw $0, 0x84+id*8(t0)
/* fixup cpu window */
cpu_win_fixup:
//
// hit = (paddr & mask) == (mmap & mask)
// mapped_addr = paddr &~mask | mmap & mask
//
// mmap[7] -> enable
// mmap[5] -> block trans enable
// mmap[4] -> cachable
// mmap[1:0] -> destination
//
// NOTE: the address windows has priority, win0 > win1 > ... > win7
/* set_cpu_window(0, 0x1c280000, 0xfff80000, 0x1c280083) // camera 512K
set_cpu_window(1, 0x1c300000, 0xfff00000, 0x1c300081) // dc 1M
set_cpu_window(2, 0x1fe10000, 0xffffe000, 0x1fe10082) // gmac0 8K
set_cpu_window(3, 0x1fe10000, 0xffff0000, 0x1fe100d0) // gmac0 64K
set_cpu_window(4, 0x1f000000, 0xff000000, 0x1f000082) // AXIMUX 16M
set_cpu_window(5, 0x00000000, 0x00000000, 0x000000f0) // ddr 0
set_cpu_window(6, 0x00000000, 0x00000000, 0x000000f0) // ddr 0
set_cpu_window(7, 0x00000000, 0x00000000, 0x000000f0) // ddr 0*/
/* set_cpu_window(0, 0x1c280000, 0xfff80000, 0x1c2800d3) // camera
// set_cpu_window(1, 0x1fc00000, 0xfff00000, 0x1fc000f2) //
set_cpu_window(2, 0x1c300000, 0xfff00000, 0x1c3000d1) // dc 1M
// set_cpu_window(3, 0x1f000000, 0xff000000, 0x1f0000d2) //
set_cpu_window(4, 0x00000000, 0x00000000, 0x000000f0)
set_cpu_window(5, 0x00000000, 0x00000000, 0x000000f0)
set_cpu_window(6, 0x00000000, 0x00000000, 0x000000f0) // ddr 0
set_cpu_window(7, 0x00000000, 0x00000000, 0x000000f0) // ddr 0*/
// after this fixup, the kernel code should be compiled with
// uncached instruction fetch patch
/* 配置内存 */
li msize, MEM_SIZE
#if !defined(NAND_BOOT_EN)
/*
手册建议，先写寄存器SD_CONFIG[31:0]，然后再写寄存器的SD_CONFIG[63:32]，
即先写低32位，再写高32位。
写三次寄存器，最后一次将最高位置一，即使能
*/
// 写第一次
li t1, 0xbfd00410 // 寄存器SD_CONFIG[31:0]的地址为0xbfd00410
li a1, SD_PARA0 // 宏SD_PARA0在sdram_cfg.S中定义的
sw a1, 0x0(t1) // 将宏SD_PARA0的值写入寄存器SD_CONFIG[31:0]
li a1, SD_PARA1
sw a1, 0x4(t1) // 同理，将宏SD_PARA1的值写入寄存器SD_CONFIG[63:32]
// 写第二次
li a1, SD_PARA0
sw a1, 0x0(t1)
li a1, SD_PARA1
sw a1, 0x4(t1)
// 写第三次
li a1, SD_PARA0
sw a1, 0x0(t1)
li a1, SD_PARA1_EN // 使能
sw a1, 0x4(t1)
// DELAY(100)
#endif
/**************************************CACHE*****************************/
#define CF_7_SE (1 << 3) /* Secondary cache enable */
#define CF_7_SC (1 << 31) /* Secondary cache not present */
#define CF_7_TE (1 << 12) /* Tertiary cache enable */
#define CF_7_TC (1 << 17) /* Tertiary cache not present */
#define CF_7_TS (3 << 20) /* Tertiary cache size */
#define CF_7_TS_AL 20 /* Shift to align */
#define NOP8 nop;nop;nop;nop;nop;nop;nop;nop
do_caches:
/* Init caches... */
li s7, 0 /* no L2 cache */
li s8, 0 /* no L3 cache */
bal cache_init // 调用汇编函数cache_init
nop
mfc0 a0, CP0_CONFIG // 将协处理器0的config寄存器的值加载到寄存器a0
and a0, a0, ~((1<<12) | 7) // a0 = a0 & ~((1<<12) | 7)
or a0, a0, 2 // a0 |= 2
mtc0 a0, CP0_CONFIG // 将寄存器a0的值写入协处理器0的config寄存器
/***********************MEMORY DEBUGGING AND COPY SELF TO RAM***********************/
//#include "newtest.32/mydebug.S"
bootnow:
/* copy program to sdram to make copy fast */
/* 先将执行拷贝pmon到内存任务的代码，拷贝到内存0xa0000000 */
/* 先确定需要拷贝的代码段为标号121到标号122之间的代码
* 由于链接时指定的起始地址是0x80010000，
* 而目前正在ROM（SPI NOR FLASH，起始地址为0xBFC00000）运行
* 所以需要用寄存器s0来修正一下地址
*/
la t0, 121f // 将下一个标号121所在地址，加载到寄存器t0
addu t0, s0 // 使用寄存器s0修正t0中的(标号121的)地址
la t1, 122f // 将下一个标号122所在地址，加载到寄存器t1
addu t1, s0 // 使用寄存器s0修正t1中的(标号122的)地址
li t2, 0xa0000000 // 将立即数0xa0000000（起始地址）加载到寄存器t2
1:
lw v0, (t0) // 将寄存器t0所指的内存地址开始4字节的数据加载到寄存器v0
sw v0, (t2) // 将寄存器v0的内容保存到寄存器t2所指的内存中
addu t0, 4 // 寄存器t0向后移4字节
addu t2, 4 // 寄存器t2向后移4字节
ble t0, t1, 1b // 如果t0 <= t1，则跳转到上一个标号1处，继续拷贝后面的4字节
nop
li t0, 0xa0000000 // 将立即数0xa0000000加载到寄存器t0
jr t0 // 跳转到起始地址0xa0000000处开始执行（拷贝任务）
nop
121:
/* Copy PMON to execute location... */
/* 将固件拷贝到起始地址为0xa0010000的内存空间
由于kseg0(0x8000 0000 - 0x9FFF FFFF)和kseg1(0xA000 0000 - 0xBFFF FFFF)是映射到物理内存的相同区域
即拷贝到0xA000 0000开始的kseg1，就相当于拷贝到0x8000 0000开始的kseg0
这就是为什么链接时，指定的地址是0x8001 0000，而拷贝的目标起始地址是0xA001 0000
*/
la a0, _start // 加载符号start所在地址0x80010000加载到寄存器a0中
addu a1, a0, s0 // 使用寄存器s0修正寄存器a0中的地址，a1=0xBFC00000
la a2, __bss_start // 加载_edata（链接脚本中的一个符号）到寄存器a2
or a0, 0xa0000000 // a0 = a0 | 0xa0000000 = 0xa0010000
or a2, 0xa0000000 // a2 = a2 | 0xa0000000，修正地址_edata
subu t1, a2, a0 // t1 = a2 - a0，即计算从start到_edata之间的长度（字节数）
srl t1, t1, 2 // t1 >>= 2，即t1除以4。(和前面类似，每次拷贝4字节，所以除以4)
// 似乎t1计算结果没有被使用，马上就被后面的覆盖了
move t0, a0 // t0 = a0 = 0xa0010000 (目标起始地址)
move t1, a1 // t1 = a1 = 0xBFC00000 (start在ROM中的地址，源起始地址)
move t2, a2 // t2 = a2 (_edata在ROM中的地址，源结束地址)
/* copy text section */
1: and t3, t0, 0x0000ffff // t3 = t0 & 0x0000ffff，取低16位
bnez t3, 2f // 如果t3不等于0，则跳转到下一个标号2处继续执行，t3的计算结果似乎没被使用，就被后面的覆盖了
nop
2: lw t3, 0(t1) // 从源地址t1处加载4字节到寄存器t3中
nop
sw t3, 0(t0) // 将寄存器t3中的4字节数据保存到目标地址t0处
addu t0, 4 // 目标地址t0后移4字节
addu t1, 4 // 源地址t1 后移4字节
bne t2, t0, 1b // 如果t2不等于t0，则跳到上一个标号1处继续拷贝，总的来说就是判断拷贝是否结束
nop
/* copy text section done. */
/* clear bss */
la t0, __bss_start
la t1, __bss_end
_clr_bss_loop:
sw zero, 0(t0)
bne t0, t1, _clr_bss_loop
addiu t0, t0, 4
/* disable interrupt */
mfc0 t0, CP0_STATUS
and t0, 0xfffffffe # By default it will be disabled.
mtc0 t0, CP0_STATUS # Set CPU to disable interrupt.
nop
/* disable cache */
mfc0 t0, CP0_CONFIG
and t0, 0xfffffff8
or t0, 0x2 # disable,!default value is not it!
mtc0 t0, CP0_CONFIG # Set CPU to disable cache.
nop
/* jump to RT-Thread RTOS */
jal rtthread_startup
nop
/* restart, never die */
j _start
nop
122:
stuck:
b stuck
nop
#endif
.extern tlb_refill_handler
.extern cache_error_handler
......
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