[coreboot] Memory corruption on Resume from S3 Baytrail

Gailu Singh gailu96 at gmail.com
Wed Dec 10 12:04:27 CET 2014


Problem resolved by reserving initial 64K memory. Thanks to Stefan for his
help.

On Wed, Dec 10, 2014 at 11:12 AM, Gailu Singh <gailu96 at gmail.com> wrote:

> Hi,
>
> In  coreboot developer manual memory map section (
> http://www.coreboot.org/Developer_Manual/Memory_map) there is specific
> mention of low memory.
>
> *0x00000 - 0x9FFFF*: Low 640kB. Should not be clobbered on S3
> suspend/resume (exceptions?)
>
> How do I tell Linux not to use this memory? I tried linux kernel argument
> memap=640K at 0x0 to reserve the space but my kernel does not boot with that.
>
> What changes are expected in Linux kernel configuration for S3
> suspend/resume to work smoothly with coreboot?
>
>
>
>
>
> On Sun, Nov 23, 2014 at 12:54 PM, Stefan Reinauer <
> stefan.reinauer at coreboot.org> wrote:
>
>> On 11/19/14 11:36 AM, Gailu Singh wrote:
>>
>>> Hi Experts,
>>>
>>> I am using Baytrail SoC board (Bayleybay CRB) and testing suspend/resume
>>> from Linux (kernel 3.10). I can suspend with pm-suspend and resume with
>>> power button; however after resuming I get following logs in Linux
>>> Corrupted low memory at c0001004 (1004 phys) = 0008eaea
>>> Corrupted low memory at c0001008 (1008 phys) = b0606600
>>> ...
>>> Corrupted low memory at c00018fc (18fc phys) = 000008ea
>>>
>>> This seems to be caused by coreboot as I do not see these logs if I use
>>> BIOS instead of coreboot.
>>> Is it true that during resume coreboot uses RAM portion already mapped
>>> by Linux and thus corrupting it. How to I avoid the RAM conflict?
>>>
>>
>> Looks like coreboot (or FSP) is overwriting this memory with some
>> trampoline code.
>>
>> One (ugly) way to fix this would be to just reserve the space in the
>> memory table. The better way would be to track down where this is actually
>> happening and fix it there.
>>
>> Stefan
>>
>
>
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