tree 52b9af31a40e52fb829777340acdf36fc5dc3f30
parent fb181e2a2c270b0d10146153aef7361829771b1d
author Jan Kiszka <jan.kiszka@siemens.com> 1674077099 +0100
committer Heinrich Schuchardt <heinrich.schuchardt@canonical.com> 1674229132 +0100

efi_loader: Avoid overwriting previous outputs on console screen clearing

Before clearing the screen, ensure that no previous output of firmware
or UEFI programs will be overwritten on serial devices or other
streaming consoles. This helps generating complete boot logs.

Tested regarding multi-output against qemu-x86_defconfig. Still, there
were remaining concerns about side effects, so this is provided as an
opt-in feature.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>