kernel decompressor problem for ARMv7

Lin Ming
2013-07-09T08:21:49Z

On Tue, Jul 9, 2013 at 4:05 PM, Will Deacon <will.deacon@arm.com> wrote:
> On Tue, Jul 09, 2013 at 08:53:05AM +0100, Lin Ming wrote:
>> On Tue, Jul 9, 2013 at 3:39 PM, Nicolas Pitre <nicolas.pitre@linaro.org> wrote:
>> > No more info needed. The kernel has to be booted with the MMU disabled
>> > as per the booting protocol documentation. You therefore have to fix
>> > your
>> > bootloader.
>>
>> OK.
>>
>> But I have to also revert below commit to make decompressor work.
>>
>> commit 5010192:
>> ARM: 7583/1: decompressor: Enable unaligned memory access for v6 and above
>>
>> It seems like caused by bootloader has Alignment fault checking enabled.
>> Any suggestion how to fix it?
>
> Well step 1 is to disable the MMU. Once you've done that, you really don't
> want to be issuing unaligned accesses (since memory will be treated as
> strongly-ordered), so the value of the alignment trap bit is irrelevant.

Thanks. Will try it.

>
> Will