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Re: GRUB and installer invisible on serial console

From: Danny Milosavljevic
Subject: Re: GRUB and installer invisible on serial console
Date: Sat, 21 Dec 2019 20:00:40 +0100

Hi Ricardo,

> Our GRUB is using fancy graphics, so I wonder if that means that it has
> switched to a mode that I simply can’t see over my serial connection.

Yeah, gnu/bootloader.scm has "gfxterm" as default for the terminal output.
That means that serial will not be used.

Valid outputs are:

         '(console serial serial_0 serial_1 serial_2 serial_3
         gfxterm vga_text mda_text morse spkmodem)

see gnu/bootloader/grub.scm .
Multiple outputs are possible.

It's possible that serial-unit (a natural number (the com port) between 0 and 3)
and serial-speed (a natural number) also need to be set up in order to be able
to use "serial".

It's possible that there would have been an automatic UEFI console handover
in grub-efi but I guess it's being overridden by our setting.
Try having our bootloader config generator not emit "terminal_output" at all
(edit gnu/bootloader/grub.scm, search for "terminal_output" and comment that
part out).  It would be interesting whether it will automatically use a
reasonable default then.

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