Re: PXE GRUB booting for BIOS and UEFI
On 4/8/22 01:23, Dominik 'Rathann' Mierzejewski wrote:
On Friday, 08 April 2022 at 08:57, Samuel Sieb wrote:
> On 4/7/22 18:54, Neal Gompa wrote:
>> On Thu, Apr 7, 2022 at 9:21 PM Chris Adams <linux(a)cmadams.net> wrote:
>>>
>>> Once upon a time, Chris Murphy <lists(a)colorremedies.com> said:
>>>> syslinux (really isolinux) is only used on installation media.
>>>
>>> It's commonly used for BIOS PXE booting as well.
>>>
>>
>> *shudders at the memories of dealing with pxelinux*
>>
>> GRUB is way better for that. Yes, you can use GRUB for PXE and UEFI netboot too.
>
> That's what I use for both.
Would you care to document your set-ups?
It's pretty simple. I just adjusted my setup a bit and tested it in a
VM in both UEFI and BIOS modes.
In dhcpd.conf:
option arch code 93 = unsigned integer 16;
In the dhcpd.conf subnet config:
next-server <tftp_IP>;
if option arch = 00:07 {
filename "efi/shim.efi";
} else {
filename "boot/grub2/i386-pc/core.0";
}
Those paths are just where I ended up putting them. (Note that in both
cases you also need the other supporting files in those directories.)
In both efi/grub.cfg and boot/grub2/i386-pc/grub.cfg there is one line:
source grub.cfg
That way both options will load the top-level grub.cfg file. It might
be possible to use a symlink instead or hard link, but this works. Both
methods now load the same grub.cfg file that you can put whatever you
want in. The same commands work in both modes, now that "linuxefi" has
been removed.