20 bootloader 跳转APP 出现 bus fault

发布于 2025-02-19 11:04:53 浏览：29 订阅该版

板子： AT32F403ARGT7 ram 96k 
rt-thread: 4.1.0

bootloader:
跳转前 以下重置操作
```c
	nvic_system_reset();
    rt_hw_cpu_reset();
    /*Close Peripherals Clock*/
    CRM->apb2rst = 0xFFFF;
    CRM->apb2rst = 0;
    CRM->apb1rst = 0xFFFF;
    CRM->apb1rst = 0;
    CRM->apb1en = 0;
    CRM->apb2en = 0;
    CRM->cfg_bit.sclksel = 0;
    CRM->cfg_bit.ahbdiv = 0;
    CRM->cfg_bit.apb1div = 0;
    CRM->cfg_bit.apb2div = 0;
    CRM->cfg_bit.adcdiv_l = 0;
    CRM->cfg_bit.adcdiv_h = 0;
    CRM->cfg_bit.clkout_sel = 0;
    CRM->ctrl_bit.hexten = 0;
    CRM->ctrl_bit.cfden = 0;
    CRM->ctrl_bit.pllen = 0;
    CRM->cfg_bit.pllrcs = 0;
    CRM->cfg_bit.pllhextdiv = 0;
    CRM->cfg_bit.pllmult_l = 0;
    CRM->cfg_bit.pllmult_h = 0;
    CRM->cfg_bit.usbdiv_l = 0;
    CRM->cfg_bit.usbdiv_h = 0;
    CRM->cfg_bit.pllrange = 0;
    CRM->clkint_bit.lickstblfc = 0;
    CRM->clkint_bit.lextstblfc = 0;
    CRM->clkint_bit.hickstblfc = 0;
    CRM->clkint_bit.hextstblfc = 0;
    CRM->clkint_bit.pllstblfc = 0;
    CRM->clkint_bit.cfdfc = 0;
    SysTick->CTRL = 0;

for (IRQn_Type irq = Reset_IRQn; irq <= UART8_IRQn; irq++)
    {
        nvic_irq_disable(irq);
        __NVIC_ClearPendingIRQ(irq);
    }
    jump_to_app = (iapfun)*(uint32_t*)(app_addr + 4);        /* code second word is reset address */
    __set_MSP(*(uint32_t*)app_addr);                        /* init app stack pointer(code first word is stack address) */
    jump_to_app();    
	nvic_system_reset();
```

app  start: 0x8020000

```c
// main.go 如下无其他逻辑
int ota_app_vector_reconfig(void)
{ nvic_vector_table_set(NVIC_VECTTAB_FLASH, 0x20000);
    return 0;
}
INIT_BOARD_EXPORT(ota_app_vector_reconfig);

static char buffer[4096];

int main (){
	......buffer赋值
	rt_kprint("xxxxxx");
}

```
运行结果, 能正常跳转到app, main函数未输出就直接fault
```
psr: 0x81090000
r00: 0x20003890
r01: 0x00000023
r02: 0x00000000
r03: 0x23232323
r04: 0x23232323
r05: 0x23232323
r06: 0x0000000a
r07: 0x00000000
r08: 0x0000000a
r09: 0xdeadbeef
r10: 0xdeadbeef
r11: 0xdeadbeef
r12: 0x00000000
 lr: 0x080230a7
 pc: 0x23232322
hard fault on thread: (NULL)

thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
main       0  init    0x20004890 0x00001000    59%   0x00000000 000
bus fault:
SCB_CFSR_BFSR:0x01 IBUSERR
```
如下修改可以正常运行
```
static char buffer[4096];
改成
static char buffer[1024];
```
app程序进行单独运行没有问题的