F22 :: EFI boot :: grub2 does not find Windows 8.1

[Pete Travis]

On 05/30/2015 01:58 PM, Adrian Sevcenco wrote:
> On 05/30/2015 06:24 PM, Pete Travis wrote:
>> On May 30, 2015 2:35 AM, "Adrian Sevcenco" <Adrian.Sevcenco at cern.ch
>> <mailto:Adrian.Sevcenco at cern.ch>> wrote:
>>> Hi! I know that there is another thread with similar subject but as
>>> i tried everything i will reiterate the problem with grub2-mkconfig
>>> not seeing the windows 8.1 even after adding custom entry. So, this
>>> are my information: [root at localhost grub.d]# parted -l Model: ATA
>>> Corsair Force 3 (scsi) Disk /dev/sda: 90.0GB Sector size
>>> (logical/physical): 512B/512B Partition Table: gpt Disk Flags:
>>> pmbr_boot
>>>
>>> Number  Start   End     Size    File system  Name
>>> Flags 8      1049kB  3146kB  2097kB
>>> bios_grub 1      5243kB  420MB   415MB   ntfs         Basic data
>>> partition          hidden, diag 2      420MB   693MB   273MB
>>> fat32        EFI system partition          boot, esp 3      693MB
>>> 945MB   252MB                Microsoft reserved partition  msftres 
>>> 4      945MB   38.2GB  37.3GB  ntfs         Basic data partition
>>> msftdata 5      38.2GB  61.3GB  23.1GB  ntfs         Basic data
>>> partition          msftdata 6      61.3GB  78.5GB  17.2GB  ext4 7
>>> 78.5GB  90.0GB  11.5GB  ext4
>>>
>>> [root at localhost grub.d]# mount | grep ^/dev/ /dev/sda6 on / type
>>> ext4 (rw,relatime,seclabel,data=ordered) /dev/sda2 on /boot/efi
>>> type vfat
>>> (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=winnt,errors=remount-ro)
>>>
>>>
> /dev/sda7 on /home type ext4 (rw,relatime,seclabel)
>>> /dev/sda4 on /mnt/WIN_C type fuseblk
>>> (rw,noatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096)
>>>
>>>
> /dev/sda5 on /mnt/WIN_D type fuseblk (rw,noatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096)
>>> [root at localhost grub.d]# cat 40_custom #!/bin/sh exec tail -n +3
>>> $0 # This file provides an easy way to add custom menu entries.
>>> Simply type the # menu entries you want to add after this comment.
>>> Be careful not to change # the 'exec tail' line above.
>>>
>>> menuentry 'Microsoft Windows 8.1' { set root='hd0,gpt4' chainloader
>>> /EFI/Microsoft/Boot/bootmgfw.efi boot }
>>>
>>> i must say that with both gpt2 and gpt4 (esp partition and C:\
>>> partition) does not work..
>>>
>>> [root at localhost grub.d]# ll /etc/grub*.cfg lrwxrwxrwx. 1 root root
>>> 29 May 30 10:07 /etc/grub2.cfg -> /boot/efi/EFI/fedora/grub.cfg 
>>> lrwxrwxrwx. 1 root root 29 May 30 10:04 /etc/grub2-efi.cfg ->
>>> /boot/efi/EFI/fedora/grub.cfg
>>>
>>> So, what i am missing? and why? (wasn't fedora tested for efi dual
>>> boot situations? i would think that is preaty obvious that a HUGE
>>> percentage of usage will be on modern efi/gpt windows 8.1 laptops 
>>> and desktops)
>>>
>>> Did anyone have a working dual boot EFI installation of Windows 8.1
>>> + fedora 22?
>>>
>>> Thank you! Adrian
>>>
>> A bios_grub partition suggests you do not have a UEFI installation of
>> Fedora. Mixing UEFI and not-UEFI will not work well.  To confirm, can
>> you share the output of `sudo efibootmgr` from your fedora
>> installation?
> You were right! In bios it was enabled the legacy option and with bios partition
> it seems that grub was working in legacy mode ...
> I set up bios to efi only and deleted the bios partition and from within a chroot (fedora live)
> i get :
> [root at x360 /]# efibootmgr -v
> BootCurrent: 0000
> Timeout: 5 seconds
> BootOrder: 0001,2001,2002,2004
> Boot0000* USB CD/DVD ROM Drive (UEFI)   ACPI(a0341d0,0)PCI(14,0)USB(3,0)USB(1,0)CD-ROM(1,2b,2798)RC
> Boot0001* fedora        HD(2,c8800,82000,f5495ca8-ccea-4573-afe6-ec42fb4cdb01)File(\EFI\fedora\grubx64.efi)
> Boot2001* EFI USB Device        RC
>
> but when i try to boot i receive the message that boot device is not found even if i already did 
> grub2-install /dev/sda from within chroot
> and also i tried with :
> --efi-directory=/boot/efi --target=x86_64-efi
>
> Any idea how to correct this?
> Thank you!
> Adrian
>
>

Grub does not live in the MBR of a drive on UEFI systems.  It's a UEFI
executable file on the EFI system partition.  In Fedora, the relevant
bits come from a completely different package.  You could try something
like this:

    - Set up a chroot with appropriate bind mounts (
https://fedorapeople.org/groups/docs/multiboot-guide/html/common_operations_appendix.html#common-chroot_from_live
)
    - # dnf remove grub
    - # dnf install grub2-efi shim
    - Create an efi boot entry (the one in your paste is from the live
image)
       
https://fedorapeople.org/groups/docs/multiboot-guide/html/GRUB-reinstalling.html

It's a somewhat complicated and involved process; if you've just
installed Fedora it may be easier to reinstall.

-- 
-- Pete