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Re: Wheezy: Questions about UEFI boot etc.

On Wed, 2013-05-15 at 13:58 +0100, Ben Hutchings wrote:
> On Wed, 2013-05-15 at 08:39 +0200, Svante Signell wrote:
> [...]
> > On the SSD the Linux partition
> > is /dev/sda5, which I made bootable (also UEFI boot). However, even if
> > grub is written to /dev/sda no grub menu appears, and only W8 starts up
> > every time. Additionally, booting from the HDD does not seem to be
> > possible, at least within W8. How to access the UEFI boot manager, can
> > it be enabled by a BIOS setting change?
> The Debian installer is supposed to set GRUB as the highest priority
> boot loader, but this may fail in some cases due to checks in Linux's
> EFI variable access code (which are there to avoid triggering BIOS bugs
> that can leave a computer completely unbootable).  Unfortunately there
> seems to be another bug in grub-install, in that it doesn't report this
> failure.

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 /)? 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?

> The BIOS might have a boot menu somewhere, where you can rearrange the
> boot order or at least choose which entry to use for the next boot.

The boot order changes possible to are: CD/DVD, SSD, USB, network.
Currently set that order now. The HDD does not seem to be able to
activate as boot device? Have not yet found the correct keys for the
Boot Manager and Boot Maintenance Manager as mentioned in:

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