Re: Wheezy: Questions about UEFI boot etc.
On Wed, 2013-05-15 at 14:44 +0100, Ben Hutchings wrote:
> On Wed, 2013-05-15 at 15:20 +0200, Svante Signell wrote:
[...]
> > Can the problem be that the EFI partition containing W8 is /dev/sda2,
> > while I have been writing grub to /dev/sda and /dev/sda5 (Linux /)?
>
> All EFI boot loaders are written to the EFI boot partition
> (probably /dev/sda1 on your system) which is an ordinary FAT file
> system.
>
> Maybe you booted the installer in BIOS mode (also called legacy or CSM)?
> If you do that, it can't access the EFI boot variables at all.
Don't really know, I have tried both options in the BIOS. Is there any
possibility to see if the DVD is booted in EFI or BIOS mode? BTW: when
booting I get the message: Error "prefix is not set".
> > I
> > have not yet dared to try to write it to /dev/sda2 where the W8 is
> > installed. The trials were made with /dev/sda5 mounted as / with and
> > without marking it as an EFI partition. (/dev/sda2 comes before
> > /dev/sda5 physically. Additionally I saw somewhere that only one EFI
> > partition is allowed per disk)
> >
> > For the install-grub /dev/sda; update-grub commands can I use the Rescue
> > mode on the DVD to check failure/success?
>
> Maybe.
So installing grub (grub-efi-amd64) to /dev/sda (the EFI partition
is /dev/sda2) is the right thing to do? (to boot Linux, and then solve
the (eventually) missing Windows 8 entry in grub later)
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