[coreboot] Skylake FSP 1.1 without verstage?

Zaolin zaolin at das-labor.org
Thu Oct 6 01:33:53 CEST 2016

Hey Trammell,

congratulations ! I guess you are releasing the coreboot payload at the
33c3 ?
Could you please submit a bug report at ticket.coreboot.org for that issue.

Best Regards

On 10/06/2016 01:25 AM, Trammell Hudson wrote:
> On Wed, Oct 05, 2016 at 03:19:11PM -0500, Aaron Durbin wrote:
>> On Wed, Oct 5, 2016 at 3:08 PM, Trammell Hudson <hudson at trmm.net> wrote:
>>> CBFS: 'Master Header Locator' located CBFS at [a00100:ffffc0)
>>> CBFS: Locating 'fallback/ramstage'
>>> CBFS: Found @ offset afc0 size 12e29
>>> Decompressing stage fallback/ramstage @ 0x7abbffc0 (743408 bytes)
>>> Loading module at 7abc0000/7abc0000 with entry 7abc0000. filesize: 0x28d88 memsize: 0xb57b0
>>> Processing 2472 relocs. Offset value of 0x7aac0000
>>> src/arch/x86/boot.c:223: jumping to 7abc0000
>>> (and then it crashes)
>> You can try writing characters to the serial console in
>> src/arch/x86/c_start.S. Do you have the ability to read post codes?
>> That's the best way to know how deep you are getting through c_start.S
>> in the jump to ramstage.
> Thanks to a servo board, I can read the port 80 codes and verified
> that the instruction causing the problem is the lgdt / jmp combo
> in c_start.S:
> _start:
>         cli
>         lgdt    %cs:gdtaddr
> #ifndef __x86_64__
>         ljmp    $0x10, $1f
> #endif
> 1:	movl    $0x18, %eax   // <---- never reached with relocatable
>> [...]
>> I'm not sure why it's crashing (or just not spitting anything out).
>> You could certainly try disabling RELOCATABLE_RAMSTAE and see if that
>> fairs better.
> It looks like CONFIG_SOC_INTEL_SKYLAKE forces relocatable ramstage;
> I've modified src/soc/intel/skylake/Kconfig to disable it and now
> it makes it all the way into the payload.
> And by adding the i915 driver to the Linux payload, it is able to
> bring up the console in a miniscule font!
> https://www.flickr.com/photos/osr/30026718432/in/photostream/lightbox/
> I'm declaring today a huge success!

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