"Latitude with broken BIOS" ?

DISCUSSION Alessandro Suardi 1 participant 1 message Jan 20, 2003

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Alessandro Suardi

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2003-01-20 15:18 UTC #0 lore raw

Quoted 11 lines · Mikael Pettersson

Quoted 9 lines · Alessandro Suardi
Quoted 4 lines
Your P4-based Latitude probably has a different BIOS than the buggy P3-based ones, and it may work better. Try commenting out the local_apic_kills_bios entry for "Dell Latitude" at around line 692 in arch/i386/kernel/dmi_scan.c and rebuild the kernel. If it
(ahem) I had tried that in 2.5.58 already ;)
However I rebuilt 2.5.59 with that change, and I'm not going further:

Quoted 8 lines

Quoted 1 line
No local APIC present or hardware disabled
Ah, your P4 needs another patch. Edit arch/i386/kernel/apic.c, function detect_init_APIC(), at line 631, and remove the "&& cpu_has_apic" after the "boot_cpu_data.x86 == 15" test. (Or check if your BIOS can be set up to boot with the local APIC enabled.)
/Mikael

The BIOS doesn't seem to have any such option... and the code change
does exactly what you imagined - pull the power cord, instant hang.

It seems even BIOS A05 of the C640 is legitimately blacklisted :(

Thanks, ciao,

--alessandro