Grub: Unknown Filesystem and kernel panics

[Gooberpatrol66]

BTRFS/GRUB2/UEFI mode/core i5/hp elitebook

I have a gentoo installation that I'm trying to boot.

The kernel is a default genkernel except with btrfs support.

When I boot the hard drive, instead of the GRUB2 menu, I get a GRUB: Unknown Filesystem error.

For some reason, if I browse for the grub.efi file in /boot with my PC's BIOS, the GRUB2 menu will load successfully, and linux gets pretty far into the boot sequence, until the kernel panics.

I have tried recording for what leads to the kernel panic, but it happens too fast, the screen ghosts, and it's impossible to read.

[TigerJr]

Maybe btrfs drivers with genkernel contained in intrd file?
_________________
Do not use gentoo, it die

[szatox]

I guess you have grub2, you were doing _something_ with it, and forgot to reinstall it afterwards so you have an inconsistent bootloader now.
Maybe a stage file is missing or damaged. Reinstalling it (grub-install or whatever it uses now, not emerge -1 grub ) should help with it.

However, since you have a more-or-less working EFI setup, do you still need that grub at all?

[Gooberpatrol66]

Alright, so apparently, my PC's EFI isn't complete and not supposed to be used or something, so I solved the grub issue by switching to BIOS mode and reinstalling grub. I'm still getting kernel panics though.

http://imgur.com/YX4QgOZ

[s4e8]

The busybox inside initrd crashed, it contains invalid instructions for your CPU. You may compile it with wrong CFLAGS.

[Gooberpatrol66]

[s4e8]

genkernel build&cache it's own busybox. You can remove initrd and skip busybox, just build root disk controller & fs driver into kernel, and use root=/dev/sdX or root=PARTUUID=xxxxx.

[Gooberpatrol66]

I fixed it with a rm /var/cache/genkernel/* and running genkernel again.

Thanks.