On 10/12/2010 09:33 AM, Avi Kivity wrote:
Aha! The piix4 specification updates says:
• IRQ9OUT#/GPO29 should be labeled as IRQ9OUT/GPO29
Even more explicitly:
14. IRQ9OUT# Is Active HI
Problem: The signal identified as IRQ9OUT#/GPO29, pin F3, is not
active level LO, it is active level HI, when APIC Chip Select
(XBCS[8]) is set.
Implication: This signal is typically used in Dual Processor capable
systems and is connected to an IOAPIC. If the IOAPIC input is
programmed for level LO, and SCIs or SM Bus events in the
PIIX4/PIIX4E/PIIX4M are programmed to be reported on IRQ9OUT, devices
using these will not be recognized by the IOAPIC and will not work
correctly.
Workaround: Program the appropriate input of the IOAPIC to active
level HI.
Status: This will not be fixed in the PIIX4/PIIX4E/PIIX4M. This is
planned to be incorporated into the PIIX4 datasheet as a specification
change.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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