I followed the CBLFS 3.0 book for a multi-lib system. My issue is with grub2. My system has 2 hard disk's, one with Win 8 and the other has partitions for my host OS (slackware) and on another partion(s) LFS. Windows and slackware are both booting via EFI and I'm using rEFInd boot manger to switch between the slackware and windows 8 currently. I have not been able to get eEFInd to detect the LFS installation. I don't know how to configure grub so it sets up the EFI correctly. Do I need to mount the EFI partition from LFS and then try to install grub? I'm lost honestly. I am good with MBR booting but UEFI is foreign to me. There's not much mention of EFI on the Grub section of the clfs book.

I have managed to boot LFS only by flashing grub to /dev/sdb6 and now my computer tries to load grub from the MBR. (It loads to the grub prompt and if I put in: configfile (hd1,msdos6)/boot/grub/grub.cfg poof it starts up the grub menu which allows me to boot. Can anyone point me in the right direction to getting LFS booting via EFI? Any advice is greatly appreciated.

LFS currently only works with standard MBR partitions, not GPT. There has been no word yet on how to install the appropriate tools for using EFI+GPT partitions yet.

You can try using legacy MBR within your BIOS.

My Linux From Scratch system works just fine on a GPT disk both booting from the natively compiled and installed GRUB in non-EFI mode and from gummiboot installed and configured from my Arch system.

Make sure your kernel configuration has "CONFIG_EFI_STUB=y" to boot the kernel image with rEFInd
https://www.kernel.org/doc/Documentation/efi-stub.txt

Legacy BIOS was what I meant, not GPT. Darn old age.

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I do not have any experience with EFI, so I cannot offer you a definitive answer, but I do notice that the LFS Book specifies the ‘--disable-efiemu’ option on the configure step for GRUB2. My guess would be that you will have to replace that with ‘--enable-efiemu’ if you want to build EFI support into the GRUB2 boot loader.

Other than that, I don’t have any suggestions to offer on this subject.