Re: [OE-core] [PATCH 1/7] bootimg_pcbios: support grub hybrid boot

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

On Tue Sep 2, 2025 at 3:58 AM 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,

It looks like this tends to fail some selftest. Autobuilder logs are not
really verbose here, but I can relaunch a build and extract more log
files if you now were you want to look.

runqemu - INFO - Running /srv/pokybuild/yocto-worker/oe-selftest-debian/build/build-st-2799227/tmp/work/x86_64-linux/qemu-helper-native/1.0/recipe-sysroot-native/usr/bin/qemu-system-x86_64 -device virtio-net-pci,netdev=net0,mac=52:54:00:12:34:02 -netdev tap,id=net0,ifname=tap0,script=no,downscript=no -object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 -drive if=none,id=hd,file=/home/pokybuild/tmp/core-image-minimal-qemux86-64.rootfs.wic.510160,format=raw -device virtio-scsi-pci,id=scsi -device scsi-hd,drive=hd -usb -device usb-tablet -usb -device usb-kbd   -cpu Skylake-Client -machine q35,i8042=off -smp 4 -enable-kvm -m 256 -serial tcp:127.0.0.1:42697,nodelay=on -serial tcp:127.0.0.1:54201,nodelay=on  -pidfile /srv/pokybuild/yocto-worker/oe-selftest-debian/build/build-st-2799227/pidfile_2799227  -S -qmp unix:./.6pnxdkdq,server,wait -qmp unix:./.p0gm_1m0,server,nowait -nographic
...
Target didn't reach login banner in 1000 seconds (09/02/25 18:40:59)
Last 25 lines of all logging (308):
c[?7l[2J[0mSeaBIOS (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..
...
RuntimeError: core-image-minimal - FAILED to start qemu - check the task log and the boot log
...
2025-09-03 00:41:04,380 - oe-selftest - INFO - ERROR: wic.Wic2.test_grub_install_biosplusefi_qemu (subunit.RemotedTestCase)

https://autobuilder.yoctoproject.org/valkyrie/#/builders/35/builds/2256

Can you have a look at the issue please?

Thanks,
Mathieu

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