[coreboot] IOAPIC Initialisation - How much do you have to do ??

Harrison, Jon (SELEX GALILEO, UK) jon.harrison at selexgalileo.com
Mon Jul 27 14:29:17 CEST 2009

OK. Problem found.

The IOAPIC IRQ0 setup was being zapped by some stuff I was trying to
debug with!

Timer now initialises OK, which makes me think that IRQs are now coming
through OK.

USB is now crapping out. I'll investigate further.

> -----Original Message-----
> From: Rudolf Marek [mailto:r.marek at assembler.cz] 
> Sent: 27 July 2009 13:07
> To: Harrison, Jon (SELEX GALILEO, UK)
> Cc: coreboot at coreboot.org
> Subject: Re: [coreboot] IOAPIC Initialisation - How much do 
> you have to do ??
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> Hi,
> Check the APIC bypass de assert message bit. 0x5b bit3 I 
> think you need to put 
> there 0.
> There are some registers from 0x70 - 0x7f documented in the 
> Programming guide 
> only. 0x7c bit 3 is hypetrtransport mode for APIC put 0 there.
> And 0x77 bit 5 I dont understand what exactly it is.
> Try flipping it too.
> Rudolf
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