Re: Unable to boot UEFI from 2.04

[Hanson Char]

Seems you are missing an EFI System partition which is necessary for UEFI boot 
(EF00).

FWIW, I’ve had success creating an EFI system partition using gdisk, 
building+installing grub 2.04 from source, and UEFI boot on both Debian and 
Centos.

Regards,
Hanson

> On Dec 2, 2020, at 12:55 PM, David Huffman <dhuffmansd@gmail.com> wrote:
> 
> I have built 2.04 from source (no errors). I have a script to create a 
> BIOS/UEFI bootable hard drive. The grub-install command I am running succeeds 
> without errors, but the kernel does not seem to execute when booting from 
> UEFI (BIOS is fine).
> 
> Adding debug=all to the configuration file shows the execution stops at:
> (...last three lines)
> 
> diskefiefidisk.c:595: reading 0x40 sectors at sector 0x48dc0 from hd1
> diskefiefidisk.c:595: reading 0x40 sectors at sector 0x48e00 from hd1
> diskefiefidisk.c:595: reading 0x40 sectors at sector 0x48e40 from hd1
> 
> If I use the grub /usr/lib/grub/x86_64-efi files (*.mod, kernel.img, etc) 
> poached from Debian 10.5, the system executes the kernel properly. If I just 
> swap out the x86_64-efi directory with the files I compiled, the kernel does 
> not execute. I am using the grub-install program I compiled from source in 
> both cases.The only difference are the files in lib/grub/x86_64-efi/.
> 
> I have found references that linuxefi.mod was removed from grub and is a 
> “distro patch”. This module appears to be missing from by source build but 
> removing it from the debian grub files didn’t seem to make a difference.
> 
> Here are the commands used to build:
> 
> configure --with-platform=efi --target=x86_64 --disable-device-mapper 
> —prefix=$GRUBDIR
> make
> make install
> 
> Inside $GRUBDIR I have all of the files I would expect from the build.
> 
> The disk has three partitions with an msdos partition table:
> 
> # sfdisk -l /dev/sdb
> 
> Disk /dev/sdb: 1305 cylinders, 255 heads, 63 sectors/track
> Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
> 
>   Device Boot Start     End   #cyls    #blocks   Id  System
> /dev/sdb1   *      0+     12-     13-    102400   83  Linux   
> /dev/sdb2         12+     25-     13-    102400   83  Linux
> /dev/sdb3         25+   1305-   1280-  10279936   83  Linux
> /dev/sdb4          0       -       0          0    0  Empty
> 
> /dev/sdb2 on /mnt type ext2 (rw)
> /dev/sdb1 on /mnt/boot/EFI type vfat (rw)
> 
> Here is the grub-install commands used:
> 
> FOR BIOS:
> grub-install —force --boot-directory=$TMPMNT/boot --target=i386-pc 
> —directory=$GRUBDIR/i386-pc  /dev/sdb
> 
> FOR UEFI       
> grub-install --removable --efi-directory=$TMPMNT/boot/EFI 
> --boot-directory=$TMPMNT/boot --target=x86_64-efi 
> --directory=$GRUBDIR/x86_64-efi /dev/sdb
> 
> At this point I am not sure what else to look at to find out what is 
> different between the modules and kernel.img file I compile and what is 
> supplied with debian. Any assistance in tracking down the problem would be 
> appreciated.
> 
> 
> - David
> 
> 
>