On 5/1/19 2:48 PM, ToddAndMargo via users wrote:
Hi All,
I have a Fedora 30 flash drive set up for dual booting
from Legacy or UEFI. It boots beautifully from UEFI.
(It also have a bios_grub partition).
It booted perfectly from both under Fedora 29.
Now when booting from legacy, it go into "System Setup".
If you press system Setup, I get a "/grub/core-system"
type error
Remaking grub.cfg, I get
# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Adding boot menu entry for EFI firmware configuration
done
Uhhhhh.. I wanted legacy, not EFI.
What am I missing?
Many thanks,
-T
My procedure:
UEFI.BIOS.Dual.Boot.txt:
References that stink:
https://forums.linuxmint.com/viewtopic.php?t=223015
https://bl.ocks.org/gdamjan/05b799162e4b3e97a30d37a89fed0fa8
https://forum.level1techs.com/t/configure-grub-to-boot-legacy-and-uefi/129382
Requirements:
Fedora 29
Before installing, gparted:
Wipe the target disk
create a partition table as GPT
create a first partition as
1 Meg
unformatted
set the partition flag to "bios_grub"
Install Fedora 29 from a UEFI machine:
"/home" was removed at installation and moved into "/"
--->>> PRESUMED !!! <<<---
The machine was install and booted from UEFI
The machine is mounted as /dev/sda
Install the legacy BIOS boot loader:
Boot into fedora on UEFI
only installs 3 files
# dnf reinstall grub2-pc
create the BIOS .cfg file
# grub2-mkconfig -o /boot/grub2/grub.cfg
Note: if this complains, you forgot to create the partition above
# grub2-install --removable --recheck --target=i386-pc
--boot-directory=/boot /dev/sda
Hi All,
Follow up:
I FINALLY got some time to work on this!
Thanks to everyone who helped me with this and a
special thanks for Ja who got me on the right path.
-T
Here are my notes.
Fedora 30+: how to create a minimal legacy boot on a previously set up
EUFI drive:
Note: this requires that you created the first partition as
1 Meg
unformatted
set the partition flag to "bios_grub"
If not, you have to go back and recreate the entire installation
Background: as of Fedora 30, grub calls entries in /etc/grug.d, so
you have to create a minimal grug.cfg file of your own and you
have to do this for every new kernel you install.
The following presumes that you are booted EUFI.
Create a grub2 partition and files for legacy to boot off of:
Note: you must have that 1 Meg partition mentioned above
1) find the device name of your flash drive and substitute it for sdx:
2) install grub2pc:
# dnf [re]install grub2-pc
3) install grub on the MBR. Triple check the USB stick sdx !!!!
# grub2-install --target=i386-pc /dev/sdx
You need three pieces of information:
1) the UUID (not PARTUUID) of the /boot drive
2) the UUID (not PARTUUID) of the / (root) drive
3) the vmlinuz and matching initramfs image you will be booting
off (both are found in /boot)
To get get the UUID of of / and /boot, find their device names
using "df":
# df -kPT / /boot
Filesystem Type 1024-blocks Used Available Capacity Mounted on
/dev/sda4 ext4 58041356 7878524 47184784 15% /
/dev/sda3 ext4 999320 184696 745812 20% /boot
Then find their UUIDs (not PARTUUID) using "ll". Note: "ll" must be
run as root:
# blkid -c /dev/null | grep "sda3\|sda4"
/dev/sda3: UUID="cd4da110-2353-43d0-8fbf-e82d6d795dfb" TYPE="ext4"
PARTUUID="55db0eaa-68a3-4fb5-8cfc-ac843f0cb65a"
/dev/sda4: LABEL="DeadStick"
UUID="b8616ae1-39ee-45dd-bfc6-b2cb5f22921f" TYPE="ext4"
PARTUUID="ad3be15f-a803-4056-a3f7-21d72ca174dd"
In this instance:
/ UUID is cd4da110-2353-43d0-8fbf-e82d6d795d
/boot UUID is b8616ae1-39ee-45dd-bfc6-b2cb5f22921f
To find vmlinuz and matching initramfs:
# ls /boot/vmlinuz*
/boot/vmlinuz-5.2.11-200.fc30.x86_64
# ls /boot/initramfs*
/boot/initramfs-5.2.11-200.fc30.x86_64.img
Create a /boot/grub2/grub.cfg file for booting from a legacy BIOS.
1) subsitute /boot's UUID in the "search" line
2) subsitute /'s (root's) UUID in the "linux" line
3) subsitute your vmlinuz in the "vmlinuz" line
4) subsitute the matching initramfs in the "initrd16" line
~~~~~~~~
set pager=1
terminal_output console
set timeout=5
menuentry 'Fedora 30 (Thirty) Legacy Boot' {
insmod part_gpt
insmod ext2
search --no-floppy --fs-uuid --set=root
cd4da110-2353-43d0-8fbf-e82d6d795dfb
linux /vmlinuz-5.2.11-200.fc30.x86_64
root=UUID=b8616ae1-39ee-45dd-bfc6-b2cb5f22921f
initrd16 /initramfs-5.2.11-200.fc30.x86_64.img
}
~~~~~~~~
reboot on a legacy system to double check. Qemu-kvm work wonders!
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