cortex-m3 on linux-2.6.33

[RK Raggit]

> IPSR=3 looks like a HardFault. This usually shows unrecoverable system
> failures though the docs aren't very clear on what could trigger this
> (or I haven't read them in detail).
>
> I can't tell more without further details. What code is around the pc
> address? You can also do an "addr2line -e vmlinux -i 800531d6".
>

I ran my testcase (inifinite loop of 'ls -l') 6 times and this is the addr2line
corresponding to the PC i received from the dump each time -

kernel/exit.c:1650
arch/arm/lib/copy_template.S:100
kernel/sched.c:5125
kernel/sched.c:5125
arch/arm/lib/copy_template.S:173
kernel/sched.c:5125

I also checked the hardfault registers during dump - in most of the cases
in turns out to be a bus fault (precise data bus error - 0xE000ED28 reads
0x8200)

--RK