Dear Wen,
welcome to coreboot!
Am Donnerstag, den 22.01.2015, 23:34 -0500 schrieb Wen Wang:
> Has anybody tried to launch GRUB2 by SeaBIOS as a payload (not grub2 on
> MBR)? I am hoping to see grub2 on SeaBIOS boot menu.
Yes, I did. You can press F12 (or the configured key) and select the
GRUB 2 payload. Also make sure to enable support for payloads in SeaBIOS
Kconfig menu.
> I followed the coreboot wiki page to compile grub2:
> git clone git://git.savannah.gnu.org/grub.git grub
> cd grub
> ./autogen.sh
> ./configure --with-platform=coreboot
> make
>
> At this point it is not clear to me how to create grub2.elf and what the
> role of memdisk is. I would appreciate it if somebody could clarify the
> steps.
You can look at `payloads/external/GRUB2/Makefile.inc` in coreboot’s
source to see how it is built when selected as payload in the Kconfig
system.
The following additional steps should get you going.
$ make default_payload.elf
Then go to the coreboot directory. Add a symlink to the built GRUB
payload file and add it compressed to the file `img/grub.lzma` in the
CBFS (coreboot file system) of your coreboot firmware image using
`cbfstool`.
$ ln -s path/to/default_payload.elf grub2.elf
$ build/cbfstool build/coreboot.rom add-payload -f grub2.elf -n
img/grub.lzma -c lzma
Add the GRUB configuration file to `etc/grub.cfg` in the CBFS of your
coreboot firmware image.
$ build/cbfstool build/coreboot.rom add -f /boot/grub/grub.cfg -n
etc/grub.cfg -t raw
Then write the image to the flash ROM chip.
If it works for you, it’d be great if you added it to the Wiki.
Thanks,
Paul
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