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GNU Mach doesn't work with EFI

From: Andrea G. Monaco
Subject: GNU Mach doesn't work with EFI
Date: Sun, 10 Jan 2021 01:15:00 +0100


it seems that GNU Mach doesn't work with EFI.  It's not that I'm fond of
EFI, in fact I hate it because it makes booting so difficult, but right
now I have only an EFI system available.
Also, I heard that many boot firmwares nowadays have only EFI and no
BIOS, or they just provide a very partial Legacy BIOS Mode.

When I issue a "multiboot /boot/gnumach.gz" in grub2 it just says
"warning: no console will be available to OS", stops for some seconds,
then reboots.

After some research, I found that EFI doesn't provide a VGA text mode
(https://forum.osdev.org/viewtopic.php?f=1&t=28429) and offers different
graphic primitives than BIOS.

Text mode is replaced with a thing called "Console I/O Protocol".  So,
to add EFI support, Mach should either start with a framebuffer console
or use this console protocol.

Is this correct? Has anyone ever worked on it?

Andrea Monaco

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