F21 Grub Issues

[Chris Murphy]

On Tue, Nov 18, 2014 at 10:18 PM, Bidski <bidski at iinet.net.au> wrote:

> Hi all,
>
> I am having an issue getting F21 to dual boot with Windows 7 on an EFI
> system.
>
> The first thing I did was to install Windows 7. This worked fine and had
> no issues.
>
> Then I installed F21 from a LiveUSB. After some hickups, which have now
> been resolved, F21 works fine.
>
> The problem I have now is that grub can not find my Windows 7
> installation. I noticed that there were no boot files for Microsoft in
> /boot/efi/EFI.
>

You're saying after installing Fedora 21 after Windows 7, that there was no
Microsoft directory in /boot/efi/EFI? Just a fedora directory?


>
> So I opened up the LVM partition that contains root, /home and swap. I
> mounted everything then chroot. I also notice that in /boot/efi/EFI there
> are two folders 'fedora' and 'Microsoft'. I then followed the usual default
> of
> grub2-install /dev/sda
>

grub2-install shouldn't be used on EFI systems. The grub2-efi package
installs a prebaked grubx64.efi on the EFI System partition, which looks
for grub.cfg on the ESP in /EFI/fedora/ whereas the grub2-install command
creates a custom grubx64.efi, deletes the original installed one, and looks
for grub.cfg in /boot/grub2/.

I suggest 'dnf reinstall grub2-efi' and then deleting the grub.cfg from
both locations and then creating a new one with 'grub2-mkconfig -o
/boot/efi/EFI/fedora/grub.cfg' and see if it has now found the Windows
bootloader and correctly created an entry for it.



> grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
>
> However, Windows 7 is still not detected.
>

Sounds like this bug. If you can reproduce this after reinstalling grub (by
reinstalling the package, not using grub2-install), and recreating the
grub.cfg, please post the grub.cfg and the results of output from
'os-prober' and confirm the existence of /boot/efi/EFI/microsoft/
https://bugzilla.redhat.com/show_bug.cgi?id=986731


Chris Murphy