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SubjectSticky IO-APIC problem
'K, here's the deal.

I have a Pentium III 933/133 (Coppermine, stepping 6) in an Intel-manufactured i810 motherboard (hey, I know it's a lame chipset, but it was on sale). On boot, the kernel (version 2.4.6-pre8) identifies and maps the IO-APIC onboard, but does not assign any IRQs to it.

The relevant boot log snippet follows.

[root@fortytwo i386]# cat /var/log/dmesg
mapped APIC to ffffe000 (0121c000)
Kernel command line: auto BOOT_IMAGE=linux-test ro root=307 BOOT_FILE=/boot/vmlinuz-2.4.6-pre8 devfs=mount pirq=9,4
PIRQ redirection, working around broken MP-BIOS.
... PIRQ0 -> IRQ 9
... PIRQ1 -> IRQ 4

And /proc/interrupts:
[root@fortytwo i386]# cat /proc/interrupts
0: 79409 XT-PIC timer
1: 5911 XT-PIC keyboard
2: 0 XT-PIC cascade
4: 990 XT-PIC es1371
8: 1 XT-PIC rtc
9: 26402 XT-PIC usb-uhci, serial
11: 16473 XT-PIC i810@PCI:0:1:0
14: 5152 XT-PIC ide0
15: 47 XT-PIC ide1
NMI: 0
ERR: 0
MIS: 0
[root@fortytwo i386]#

This problem also occurs when booting without the pirq switch. I've configured everything the way it's mentioned in Documentation/i386/IO-APIC.txt, but it doesn't help. Anyway, thx in advance for the help.

-- Colin

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