Re: EFI Network drivers being disabled when booting with Grub via PXE

[Andrei Borzenkov]

On 01.07.2021 15:12, Gustavo Henrique wrote:
> Hello all,
> I am facing an issue, if anyone can help me with this, I would appreciate
> it a lot.
> When I boot directly on Grub via USB drive then select UEFI Shell .efi
> (also in USB drive) to boot, the network drivers work fine, I can list them
> using drivers command as shown below (just some examples, not all network
> drivers are listed):
> 
> 19E 0000000A D N N   1   0 Simple Network Protocol Driver
> Fv(AF4A9118-29A7-4F62-BB8C-E5B79013CB2E)/FvFile(A2F436EA-A127-4EF8-957C-8048606FF670)
> 1A3 0000000A B N N   2  11 IP4 Network Service Driver
> Fv(AF4A9118-29A7-4F62-BB8C-E5B79013CB2E)/FvFile(9FB1A1F3-3B71-4324-B39A-745CBB015FFF)
> 1AA 0000000A B N N   2   2 TCP Network Service Driver
> Fv(AF4A9118-29A7-4F62-BB8C-E5B79013CB2E)/FvFile(1A7E4468-2F55-4A56-903C-01265EB7622B)
> 1AC 0000000A B N N   8   1 UEFI PXE Base Code Driver
>  
> Fv(AF4A9118-29A7-4F62-BB8C-E5B79013CB2E)/FvFile(B95E9FDA-26DE-48D2-8807-1F9107AC5E3A)
> 
> So, the problem isn't with Grub itself. The problem happens when I boot via
> PXE. The server sends the Grub .efi file that is loaded with no problems,
> and then I boot the UEFI Shell. 

What exactly "boot the UEFI Shell" means? How do you "boot" it? What
grub command(s) do you use?

> Then, all the network drivers seems to be
> disabled, take a look to drivers command:
> 
> 19E 0000000A D N N   1   0 Simple Network Protocol Driver
> Fv(AF4A9118-29A7-4F62-BB8C-E5B79013CB2E)/FvFile(A2F436EA-A127-4EF8-957C-8048606FF670)
> 1A3 0000000A ? N N   0   0 IP4 Network Service Driver
> Fv(AF4A9118-29A7-4F62-BB8C-E5B79013CB2E)/FvFile(9FB1A1F3-3B71-4324-B39A-745CBB015FFF)
> 1AA 0000000A ? N N   0   0 TCP Network Service Driver
> Fv(AF4A9118-29A7-4F62-BB8C-E5B79013CB2E)/FvFile(1A7E4468-2F55-4A56-903C-01265EB7622B)
> 1AC 0000000A ? N N   0   0 UEFI PXE Base Code Driver
>  
> Fv(AF4A9118-29A7-4F62-BB8C-E5B79013CB2E)/FvFile(B95E9FDA-26DE-48D2-8807-1F9107AC5E3A)
> 
> As you can see, except for the Simple Network Protocol Driver, all network
> drivers are shown as "?" type and no devices are managed by them (they look
> all disabled). I tried to connect them using the "connect -r" command, but
> it did nothing. Tried also "reconnect" command, but it hangs forever with
> the prompt cursor blinking.
> Do you know why it's happening and how I can bypass it (maybe a grub
> configuration)?
> 
> PS.: Booting directly on UEFI Shell via PXE this issue does not reproduce,
> the drivers are ok, the problem is the combination PXE + Grub.
> 
> Thanks in advance!
>