On 22/02/2023 at 17:33, Chandler wrote:
Pascal Hambourg wrote on 2/21/23 9:13 AM:
GRUB_SERIAL_COMMAND="serial --unit=1 --speed=115200"
GRUB_TERMINAL=serial

Alright!  this has got to be the key...

Yes!  It worked!  ...for the most part...  I actually got to see the
menu, but for some reason my keyboard input wasn't recognized.  I tried
pushing down arrow to move the menu selector but it didn't do anything.

What about the <enter> key ?

Maybe you need to pass options about the serial terminal features. The GRUB documentation mentions a --dumb option for non-VT100 compatible terminals, but it is not clear which command it applies to.

<https://www.gnu.org/software/grub/manual/grub/grub.html#Serial-terminal>

Does it matter that I set GRUB_TERMINAL="console gfxterm serial"?
gfxterm is only valid as terminal_output, so you may need to split in two:

GRUB_TERMINAL_INPUT="console serial"
GRUB_TERMINAL_OUTPUT="console gfxterm serial"

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