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Re: Grub2 UEFI boot and serial console output

From: Andrei Borzenkov
Subject: Re: Grub2 UEFI boot and serial console output
Date: Wed, 11 Jan 2017 19:45:21 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

11.01.2017 16:27, Matwey V. Kornilov пишет:
> Hello,
> What is the proper way to output GRUB2 menu to serial rs232 console when
> UEFI boot is used? I've copy-pasted GRUB_SERIAL_COMMAND="serial --unit=0
> --speed=115200" from Google because I didn't find anything else. It
> doesn't work.
> Now, reading grub sources, I see that the proper way should probably be
> something like GRUB_SERIAL_COMMAND="serial efi0".

This is platform dependent. --unit=0 refers to COM1 on PC BIOS platform.
On EFI grub is using EFI Serial I/O Protocol and enumerates all handles
with this protocol using efiXX names. Then there is USB serial driver,
ARC and IEEE1275 where names are provided by firmware etc.

> Could you please point me to proper documentation?

You are welcome to contribute to it. Adding template section for
platform dependent serial information and filling it with information
known so far will be excellent - then other may extend it.

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