GNU bug report logs - #39095
GRUB EFI should have a 'chainloader' option

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: symphonia <at> disroot.org
To: bug-guix <at> gnu.org
Subject: GRUB EFI should have a 'chainloader' option
Date: Sun, 12 Jan 2020 12:08:08 +0000

To dual boot with NixOS and other operating systems it would be nice to have 'chainloader' so that this configuration would work:
(bootloader
    (bootloader-configuration
      (bootloader grub-efi-bootloader)
      (target "/boot/efi")
      (menu-entries
       (menu-entry
        (label "systemd-boot")
        (chainloader "/EFI/Boot/bootx64.efi")))

Message #8 received at 39095 <at> debbugs.gnu.org (full text, mbox):

From: Bengt Richter <bokr <at> bokr.com>
To: symphonia <at> disroot.org
Cc: 39095 <at> debbugs.gnu.org
Subject: Re: bug#39095: GRUB EFI should have a 'chainloader' option
Date: Sun, 12 Jan 2020 06:55:28 -0800

Hi symphonia,

On +2020-01-12 12:08:08 +0000, symphonia <at> disroot.org wrote:
> To dual boot with NixOS and other operating systems it would be nice to have 'chainloader' so that this configuration would work:
> (bootloader
>     (bootloader-configuration
>       (bootloader grub-efi-bootloader)
>       (target "/boot/efi")
>       (menu-entries
>        (menu-entry
>         (label "systemd-boot")
>         (chainloader "/EFI/Boot/bootx64.efi")))
> 
> 
> 

I just got a librem13v4 with PureOS installed booting via Coreboot amd grub,
and found that it will boot legacy mbr usbs, but would not boot a UEFI-bootable
USB or system on external USB SSD, though it shows up in a list of bootables.
(I've seen a reference to some kind of tool that converts a GPT partition to MBR style,
but I don't want to do that).

Does anyone know if efibootmgr and coreboot see bios nvram compatibly?
Or a workaround?

I saw your post and am hoping to find a possibly similar 'chainloader'
solution, but worry that the second loader may mess incompatibly with bios nvram.
-- 
Regards,
Bengt Richter

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