Re: [coreboot] Execute Linux on AMD DB-FT3b-LC through GRUB2

[Zoran Stojsavljevic]

Hello Grigore,

I have here some dummy questions (forgive me for my ignorance), but I need
to ask them just for the sake of curiosity (maybe, after all, we can get
somewhere if I articulate questions in the right direction/right format for
this problem):
> If I put a proprietary AMI BIOS, GRUB2 works without issue in gfxterm

mode and boots Linux without issue.

[1] What Linux architecture are you using (32 or 64)?
[2] Which Linux distro?
[3] Which kernel version?

If you put AMI BIOS, the following questions I would like to know:

[4] Are you using 32 or 64 BIOS?
[5] Which mode are you using for booting (legacy/CSM ON or UEFI/CSM OFF)?
[6] In the accordance with [5], what video component you have set with
CMOS: vBIOS or GOP driver?

Not sure, but it seems to me that you are using too old/outdated GRUB2
version (or maybe I am also mistaken)?
[7] Could you tell us, which GRUB2 version you are using?

Thank you,
Zoran

On Mon, Nov 28, 2016 at 7:13 PM, Grigore Lupescu via coreboot <
[e-mail]> wrote:
> Hello,
>
> I am trying to run Linux through the GRUB2 payload. I am not tied to GRUB2
> but it's the only payload that gives me HDMI output (board has no serial
> port) using Coreboot and AMD FT3B-LC.
>
> I have the latest Coreboot sources, have set config accordingly (e.g.
> CONFIG_MAINBOARD_SMBIOS_PRODUCT_NAME="DB-FT3b-LC"...), getting an image
> on HDMI and the GRUB2 payload is executing.
> In GRUB2 payload I seem to have an overflow issue possibly related to the
> *vga_text* mode. If I put a proprietary AMI BIOS, GRUB2 works without
> issue in gfxterm mode and boots Linux without issue.
>
> Using Coreboot every time the screen gets full of text, GRUB2 re-executes.
> If I though set the terminal_output to cbmemc then commands would execute
> but Linux still fails to execute - at the end GRUB2 would restart.
>
> Also the GRUB2 payload on Coreboot does see the drive/files and attempts
> to execute - I looks like a GRUB2/Coreboot config/code problem.
>
> I execute the below in GRUB2 (which work on AMI BIOS + GRUB2).
> grub> set root=(hd0,gpt2)
> grub> linux /boot/vmlinuz-3.13.0-29-generic root=/dev/sda2
> grub> initrd /boot/initrd.img-3.13.0-29-generic
> grub> boot
> Would anyone have any recommendation about the overflow in GRUB2
>
> payload ? - related to Coreboot.
> 2. Any suggestions on booting Linux given this board's limitations on
> output (HDMI only) ?
>
> Thank you,
> Grigore