On Sun, 2019-05-05 at 00:12 -0700, ToddAndMargo via users wrote:
> On 5/4/19 11:42 AM, Chris Murphy wrote:
> > The grub2-mkconfig script detects EFI and creates a "System setup"
> > menu entry so the user can get into firmware setup (functionally the
> > same thing as an F key at boot time to get into what some people call
> > 'BIOS setup' but that's confusing to say on a UEFI system which
> > doesn't really have BIOS, hence "System setup").
>
> Hi Chris,
>
> This stick has to go into and and all machines.
>
> I have two qemu-kvm machines set up to test. One with EFI bios
> and one with Legacy bios. Nether have a "compatibility mode"
>
> So far, I can boot into EFI perfectly.
>
> Legacy, I get a Grub> prompt
>
> How do I trick grub2-mkconfig into thinking I have a legacy
> machine when I am booted into the EFI machine?
>
This has probably been done to death, but I now
have a BIOS & EFI bootable F30 USB Stick.
Works OK on an old BIOS Only laptop &
on m/c with EFI & compatibility mode.
No Guarantees!
>From my notes
Update F30 2019_05_09
Once an efi bootable F30 USB stick has been created then:
Boot from it in efi mode
dnf [re]install grub2-pc only installs 3 files grub2-pc, grub2-pc-modules, ...
grub2-install --target=i386-pc /dev/sda install grub on the MBR (triple check the USB stick sda!!!!)
//---------------------------------------
Create a Minamalist grub.cfg file
The UUIDs, kernel & initrd versions must be changed as required
Be prepared to re-create this file when a new kernel is created
//--------------------------------------
Remember these quotes "EOF_GRUB_CFG" inhibit variable substitution.
Remember "expand -t 4 filename" to prevent TABs being present in the heredoc.
"cat -T filename" shows TABs.
Move /boot/grub2/grub.temp to /boot/grub2/grub.cfg when satified with the result!
cat > /boot/grub2/grub.temp <<"EOF_GRUB_CFG"
set pager=1
terminal_output console
set timeout=5
menuentry 'Fedora 30 (Thirty) ' {
insmod part_gpt
insmod ext2
search --no-floppy --fs-uuid --set=root fe6b44f8-0f5a-41f3-a11a-142461c9fe6c
linux /boot/vmlinuz-5.0.11-300.fc30.x86_64 root=UUID=fe6b44f8-0f5a-41f3-a11a-142461c9fe6c
initrd /boot/initramfs-5.0.11-300.fc30.x86_64.img
}
EOF_GRUB_CFG
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