kernel decompressor problem for ARMv7

[Lin Ming]

On Sat, Jul 6, 2013 at 12:30 AM, Nicolas Pitre <nicolas.pitre at linaro.org> wrote:
> On Fri, 5 Jul 2013, Will Deacon wrote:
>
>> On Fri, Jul 05, 2013 at 09:44:12AM +0100, Lin Ming wrote:
>> > Hi all,
>>
>> Hello,
>>
>> > I'm porting BSP code from v2.6.36 to v3.10 kernel. It's ARMv7 processor.
>>
>> Which specific processor/SoC?
>>
>> > But decompressor doesn't work. With a lot of debug, I finally find
>> > below 2 commits related.
>> > Kernel uncompress OK with these commits reverted.
>> >
>> > dbece45: ARM: 7501/1: decompressor: reset ttbcr for VMSA ARMv7 cores
>> > (Introduced in v3.6-rc6)
>> >
>> > 5010192: ARM: 7583/1: decompressor: Enable unaligned memory access for
>> > v6 and above
>> > (Introduced in v3.7-rc8)
>> >
>> > Any hint to fix it?
>>
>> There's not really enough information to go on here. What specifically
>> fails? Also, do you have to revert *both* of the above changes to get things
>> working again?
>
> Also, what is the bootloader used here?

uboot.

>
> Does the bootloader call the kernel with the MMU off as documented in
> Documentation/arm/Booting?

How to check this?

I'll check uboot code or add debug code in boot/compressed/head.S to
check it next Monday.

>
> Nicolas