ARM cortex-a5移植碰到的tick问题

发布于 2019-09-02 20:34:06 浏览：2719 订阅该版

1. 最新code，gcc编译，ARM cortex-a5的核，启用了单核，参考了`bsp\qemu-vexpress-a9`的代码
2. 修改了其中的link.lds地址，GIC地址，drv_timer.c，serial.c，board.c的memory表等
3. rtthread_startup中调用rt_system_scheduler_start后进来第一个时钟中断，处理完成后正常执行到`start_gcc.S`
`vector_irq`的line 232 位置的`subs    pc,  lr, #4`，此时查看lr寄存器的值为`rt_thread_timer_entry`的地址+4，单步执行后直接进入`ldr pc, _vector_dabt`。
不能进入app的main函数

串口打印：
```
> \ | /
- RT -     Thread Operating System
 / | \     4.0.2 build Sep  2 2019
 2006 - 2019 Copyright by rt-thread team
hello rt-thread
hello rt-thread:0
data abort:Execption:
r00:0x00000000 r01:0xdeadbeef r02:0xdeadbeef r03:0xdeadbeef
r04:0xdeadbeef r05:0xdeadbeef r06:0xdeadbeef r07:0xdeadbeef
r08:0xdeadbeef r09:0xdeadbeef r10:0xdeadbeef
fp :0xdeadbeef ip :0xdeadbeef
sp :0xb8048b18 lr :0xb801b4b8 pc :0xb8027d64
cpsr:0x00000013
thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
tshell    20  running 0x00000044 0x00001000    03%   0x00000009 000
tidle0    31  ready   0x00000044 0x00000400    06%   0x00000020 000
timer      4  suspend 0x0000549c 0x00000400    48%   0x00000009 000
main      10  suspend 0x000000b4 0x00000800    34%   0x00000013 000
shutdown...
(0) assertion failed at function:rt_hw_cpu_shutdown, line number:79
```
请教大神么，一般情况会是什么原因造成的？谢谢！