My cpu is at91rm9200
When start barebox at reset time by burn it in Nor flash, all things Ok.
But when start it by my first stage boot program, It's crash. And
Execption process code which install by my boot program, report Undef
instruction detected.
The only diff is my boot program change the cpu to svc mode already.
I try the flowwing patch:
------------------------------------------------
--- a/arch/arm/cpu/lowlevel.S
+++ b/arch/arm/cpu/lowlevel.S
@@ -4,6 +4,7 @@
.section ".text_bare_init_","ax"
ENTRY(arm_cpu_lowlevel_init)
+ mov r2, lr
/* set the cpu to SVC32 mode */
mrs r12, cpsr
bic r12, r12, #0x1f
@@ -35,5 +36,5 @@ ENTRY(arm_cpu_lowlevel_init)
mcr p15, 0, r12, c1, c0, 0
- mov pc, lr
+ mov pc, r2
ENDPROC(arm_cpu_lowlevel_init)
------------------------------------------------
The problem dispeared, All things worked!!
I'm not very familiar with asm code,
Anybody tell me is this a bug, Or my boot program has strange behavior?
Thanks!!
--
Best Regards,
zzs
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