Четверг, 27 февраля 2014, 14:15 +08:00 от zzs <zzs213@xxxxxxx>: > 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? I can not say anything about this issue, but maybe something will help article below: http://www.heyrick.co.uk/armwiki/The_Status_register --- _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
