[SOLVED] Grub EFI Booting issues

drillsar · 04-28-2019, 07:22 PM

OK I can't boot into my system and I dont know why. Could it be the HD number wrong or Partition number wrong?

Here is what I did:

My dev and partition info

I also have another hard drive which is /dev/sda but thats windows

/dev/sdb1 EFI
/dev/sdb2 Linux Partition

mount -vt vfat /dev/sdb1 /boot/efi

Installed Popt; Pciutils; Freetype2; dosfstools; EFIVAR-37; EFIBOOTMGR-14

Installed Grub2 with this:

./configure --prefix=/usr \
--sbindir=/sbin \
--sysconfdir=/etc \
--disable-efiemu \
--enable-grub-mkfont \
--with-platform=efi \
--target=x86_64 \
--program-prefix="" \
--with-bootdir="/boot" \
--with-grubdir="grub" \
--disable-werror

my /etc/fstab

/dev/sdb1 /boot/efi vfat defaults 0 2
/dev/sdb2 / ext4 defaults 1 1
efivarfs /sys/firmware/efi/efivars efivarfs defaults 0 1
proc /proc proc nosuid,noexec,nodev 0 0
sysfs /sys sysfs nosuid,noexec,nodev 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
tmpfs /run tmpfs defaults 0 0
devtmpfs /dev devtmpfs mode=0755,nosuid 0 0

# End /etc/fstab

Ran this:

grub-install --target=x86_64-efi --efi-directory=/boot/efi \
--bootloader-id=LFS --recheck --debug

Ran efibootmgr results:
Boot0001* LFS
Boot0005* Hard Drive
Boot0006 CD/DVD Drive
Boot0007 USB
Boot0008* UEFI: SanDisk

My grub.cfg:

# Begin /boot/grub/grub.cfg
set default=0
set timeout=5

insmod gzio
insmod part_gpt
insmod ext2
set root=(hd0, 1)
# hd[x] is the drive of the LFS partion and gpt[y] is the partition

insmod efi_gop
insmod efi_uga
insmod font
if loadfont /grub/unicode.pf2; then
loadfont /grub/unicode.pf2
set gfxmode=auto
insmod gfxterm
set gfxpayload=keep
terminal_output gfxterm
fi

menuentry "GNU/Linux, Linux <kernel name>" {
linux /boot/vmlinuz-4.20.12-lfs-8.4>; root=/dev/sdb2 ro
}

Did I miss something?

GlennsPref · 04-28-2019, 08:28 PM

Hi, I think you need to change the the line...

set root=

to reflect the gpt partition, not the msdos naming... hd0

check this out...

https://wiki.mageia.org/en/How_to_set_up_kernel_options

colorpurple21859 · 04-28-2019, 08:39 PM

Quote:

OK I can't boot into my system and I dont know why.

How far are you getting in the boot process? No grub menu, boots straight into windows, grub menu but boot fails, what?

drillsar · 04-28-2019, 10:40 PM

No grub menu

colorpurple21859 · 04-29-2019, 04:59 AM

Have you tried to go into your bios boot selection by using your f-keys, etc, some other key to select grub?, do you get a grub prompt "grub>" The more information on where the boot process fails at will help in pinpointing the problem.

drillsar · 04-29-2019, 05:59 PM

I was told you really don't need grub for EFI..
I am going to try this from this link:

https://unix.stackexchange.com/quest...boot-partition

drillsar · 04-29-2019, 08:37 PM

Ok I think making progress.. I installed efibootmgr and efivars.

Again Boot EFI partition is /dev/sdb1
Root Linux System partition /dev/sdb2

Code:

I ran blkid /dev/sdb2

results:

Code:

/dev/sdb2: UUID="f4320fbd-7ebc-46b8-8d1f-90ddc9348287" TYPE="ext4" PARTUUID="f9b06682-c0d1-442a-bf3f-5df9da35df21"

Code:

cp /boot/vmlinuz-4.20.12-lfs-8.4 /boot/efi/EFI/LFS/vmlinuz-4.20.12-lfs-8.4.efi

ran the following:

Code:

echo "root=UUID=f4320fbd-7ebc-46b8-8d1f-90ddc9348287 ro quiet rootfstype=ext4" |
  iconv -f ascii -t ucs2 |
  efibootmgr \
    --create --gpt \
    --disk /dev/sdb --part 1 \
    --label "Linux From Scratch OS" \
    --loader "\\EFI\\LFS\\vmlinuz-4.20.12-lfs-8.4.efi" \
    --write-signature --append-binary-args -

When I reboot I get the following:

Kernel Panic not syncing: VFS unable to mount root fs on unknown block (0,0)

drillsar · 04-29-2019, 09:17 PM

Solved

Instead of UUID I used root=/dev/sdb2

I think going to write up a hint for others.