[U-Boot] [PATCH 2/4][v2] powerpc/85xx:Fix MSR[DE] bit in MSR to support debugger

[Joakim Tjernlund]

Scott Wood <scottwood at freescale.com> wrote on 2012/04/25 20:43:22:
>
> On 04/25/2012 05:57 AM, Joakim Tjernlund wrote:
> >>
> >> Debugging of e500 and e500v1 processer requires MSR[DE] bit to be set always.
> >> Where MSR = Machine State register
> >>
> >> Make sure of MSR[DE] bit is set uniformaly across the different execution
> >> address space i.e. AS0 and AS1.
> >
> > Hi
> >
> > We are trying to bring up our custom P2010 RDB based board. boot is NOR
> > based and we cannot get past the rfi below.
> >    lis   r6,MSR_IS|MSR_DS at h
> >    ori   r6,r6,MSR_IS|MSR_DS at l
> >    lis   r7,switch_as at h
> >    ori   r7,r7,switch_as at l
> >
> >    mtspr   SPRN_SRR0,r7
> >    mtspr   SPRN_SRR1,r6
> >    rfi
> >
> > switch_as:
> >
> > We end up with a TLB exception no matter what we do, even after applying this patch.
>
> Did you apply the entire patchset, and define CONFIG_SYS_PPC_E500_DEBUG_TLB?

No, but this code is executed before any of the other parts of the patch. Anyhow, I just
found the problem(really obvious once I found it).
During bring up we had to load uboot in the middle of the flash instead of
the end because we have a flash burn problem in the end of the flash that we do not
understand yet. We think it may be related to DDR3 being misconfigured by the emulator(BDI3000).
I do not understand why this emulator can not use the L2SRAM instead? Is there something
magic behind the L2SRAM so it is impossible to use it as a work area for
flash burning?

 Jocke