Re: iPXE efi chainloading grub2 pxe efi file

[Andrei Borzenkov]

18.09.2015 03:05, Rivard, Matthew T пишет:
> I've got a good working EFI Grub2 efi Bootloader that works fine when its 
> directly handed off to by the DHCP for PXE, however, if I attempt to chainload 
> it from iPXE snponly.efi, it goes straight to the grub command prompt.
>
> I've tried embedding the grub.cfg file via -c on the grub-mkimage command, but it spews 
> out the grub file as a stream of "command not found prompts" and then still 
> goes to the grub command line.

Embedded config is processed very early, before normal.mod is loaded, so 
only commands available at rescue prompts are present.

> If I try embedding all of the modules directly into grub.efi during mkimage, 
> along with the config file, it then throws a grub_divmod64_full not found error.

Embedding all modules in grub.efi is usually wrong (not all modules can 
be loaded concurrently) either.

Try creating standalone image with grub-mkstandalone. This image 
contains all grub modules in memory disk (as cpio archive) and grub is 
configured with $prefix pointing to this disk. You can also add own 
files, in particular put grub.cfg in memory disk.

> What is the ideal way to chain load my grub.efi file from iPXE so that it works 
> the same as if it was the direct handoff from the DHCP/TFTP server?
>
> Unfortunately, in order to allow for selecting either our EFI WDS Server or our 
> EFI Linux Server, I have to use iPXE first, as chainloading snponly.efi from 
> grub2 ends up with iPXE snp not being able to enumerate anything from the PCI 
> Bus.

Hmm ... this actually sounds like exclusive SNP open (used by both iPXE 
and GRUB) messes something up. For testing you could try to revert 
49426e9fd2e562c73a4f1206f32eff9e424a1a73 (and 
f348aee7b33dd85e7da62b497a96a7319a0bf9dd which depends on it) to see if 
it makes any difference.

> Using git pulls for both that were from yesterday.
>
> Matt R.
>
>
>
>
> _______________________________________________
> Help-grub mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/help-grub