Re: kernel goes dark on boot

[Joerg Sonnenberger <joerg%bec.de@localhost>]

Am Tue, Apr 04, 2023 at 08:30:51AM +0000 schrieb Emmanuel Dreyfus:
> Debugging what happens after that is more tricky. This is assembly
> code, I am not sure I can printf from there. I try to make the
> machine reboot at startprog64() start to see if I just reach that 
> place.

Look for beep_on_reset in the ACPI wake code. If your machine has a PC
speaker emulated, that might be the easiest option:

        movb    $0xc0,%al
        outb    %al,$0x42
        movb    $0x04,%al
        outb    %al,$0x42
        inb     $0x61,%al
        orb     $0x3,%al
        outb    %al,$0x61

Joerg