Re: [OE-core][PATCH v3 1/8] bootimg_pcbios: support grub hybrid boot

["Mathieu Dubois-Briand" <mathieu.dubois-briand@bootlin.com>]

On Fri Sep 5, 2025 at 6:41 PM CEST, Vincent Davis Jr wrote:
> If caller wants to primarily leverage
> grub as the primary boot loader current
> oe-core doesn't support booting grub when
> the boot firmware is legacy BIOS based and
> the partition table format is GPT based.
>
> Issue GPT header reside where core.img
> should be located (at byte 512).
>
> To navigate around issue core.img was
> moved to a seperate partition.
>
> If disk is a GPT disk caller must specify
> the file system type as none and set the
> partition type as BIOS boot. No filesystem
> will be created on partition. This also
> allows wic plugin to know where to dd
> core.img.
>
> Unfortunately No deep dive into grub-install
> was perform to know the exact bytes changed
> in hybrid boot case. To see the change in
> bytes generated boot.img + core.img was compared
> to boot.img + core.img after grub-install was
> executed using the xxd command.
>
> Signed-off-by: Vincent Davis Jr <vince@underview.tech>
> ---

Hi Vincent,

We still have the same failure as on v2. Still happening with selftests
running on debian host, so there might be something related to the host
configuration.

ERROR: Qemu log output from /srv/pokybuild/yocto-worker/oe-selftest-debian/build/build-st-2287526/tmp/work/qemux86_64-poky-linux/core-image-minimal/1.0/testimage/qemu_boot_log.20250907083922:
SeaBIOS (version rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org)
...
iPXE (http://ipxe.org) 00:02.0 CA00 PCI2.10 PnP PMM+0EFC6560+0EF26560 CA00
Press Ctrl-B to configure iPXE (PCI 00:02.0)...
...
Booting from Hard Disk..
2025-09-07 08:56:24,256 - oe-selftest - INFO - 9: 79/94 577/639 (1085.73s) (0 failed) (wic.Wic2.test_grub_install_biosplusefi_qemu)
2025-09-07 08:56:24,265 - oe-selftest - INFO - testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/srv/pokybuild/yocto-worker/oe-selftest-debian/build/meta/lib/oeqa/utils/commands.py", line 390, in runqemu
    qemu.start(params=qemuparams, ssh=ssh, runqemuparams=runqemuparams, launch_cmd=launch_cmd, discard_writes=discard_writes)
  File "/srv/pokybuild/yocto-worker/oe-selftest-debian/build/meta/lib/oeqa/targetcontrol.py", line 179, in start
    raise RuntimeError("%s - FAILED to start qemu - check the task log and the boot log" % self.pn)
RuntimeError: core-image-minimal - FAILED to start qemu - check the task log and the boot log

https://autobuilder.yoctoproject.org/valkyrie/#/builders/35/builds/2280

Thanks,
Mathieu

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com