Re: [gentoo-user] Change EFI to BIOS Boot

[Facu Curti]

On Sat, Apr 12, 2014 at 08:16:46AM -0400, Tom H wrote:
> On Sat, Apr 12, 2014 at 6:45 AM, Facu Curti <facu.curti@×××××.com> wrote:
>
>
> > Hi all. First at all i apologize if my english is not enough.
> > When I installed gentoo, I do that with UEFI, and gpt partitions. But
> > right now, I tried to install XEN, and this not works with EFI. I cant
> > wait until somebody fix this problem, So i'm thinking to change "EFI" to
> > "BIOS" boot.
> >
> > So, I deleted the efi (/boot/efi) partition, edited make.conf, and deleted
> > /etc/default/grub.
> >
> > After that, I made a new partition with bios_grub
> > flag. As explained in [1]. And reinstalled grub2 (with new flags).
> > But I can't boot. Anyway, I can boot from a live cd without
> > efi, so the problem is not in bios.
>
> Did you enable BIOS compatibility mode in the firmware?
>
> Different firmwares have different names for this but a common one is
> CSM (compatibility support module).
>

yes. It is enabled. And I can boot from a liveCD without EFI support
(tails). So the problem should be on grub I think.
>
> > I can't find the problem. ¿Some ideas?
> >
> > parted -l /dev/sdb:
> >
> > Model: ATA KINGSTON SV300S3 (scsi)
> > Disk /dev/sdb: 120GB
> > Sector size (logical/physical): 512B/512B
> > Partition Table: gpt
> > Disk Flags:
> >
> > Numero  Inicio  Fin     Tamaño  Sistema de ficheros  Nombre  Banderas
> >  1      1049kB  11,5MB  10,5MB                               bios_grub
> >  2      58,7MB  24,8GB  24,7GB  ext4                 rootfs  arranque
> >  3      24,8GB  28,8GB  3999MB  linux-swap(v1)       swap
> >  4      28,8GB  120GB   91,2GB  ext4                 home
> >
> > I made install with:
> > grub2-install --target=i386-pc --recheck --debug /dev/sdb
> > grub2-mkconfig /boot/grub/grub.cfg
>
> It's "grub2-mkconfig -o /boot/grub/grub.cfg".
>

Yes. It was a typing mistake on email. But I ran the command correctly.
I attach my grub.cfg

Thank you for help!