Michael Fratoni wrote:
> I thought 1-15 was all that was physically possible. It is certainly all
> that is available on my i686 machines.
Physically possible, yes. However, on smp machines, you enter a different ball
game all together. The most obvious notification of this would be in dmesg:
IRQ to pin mappings:
IRQ0 -> 2
IRQ1 -> 1
IRQ3 -> 3
IRQ4 -> 4
IRQ6 -> 6
IRQ7 -> 7
IRQ8 -> 8
IRQ12 -> 12
IRQ13 -> 13
IRQ14 -> 14
IRQ15 -> 15
IRQ18 -> 2
IRQ24 -> 8
IRQ26 -> 10
IRQ31 -> 15
PCI->APIC IRQ transform: (B0,I2,P0) -> 18
PCI->APIC IRQ transform: (B0,I6,P0) -> 31
PCI: Enabling memory for device 00:7a
PCI->APIC IRQ transform: (B1,I1,P0) -> 24
PCI->APIC IRQ transform: (B1,I2,P0) -> 26
Which then results in:
[2] 21:22:48 <kirash@speedy:~> cat /proc/interrupts
CPU0 CPU1
0: 400188211 0 XT-PIC timer
1: 552 604 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
8: 1 0 IO-APIC-edge rtc
12: 5 37 IO-APIC-edge PS/2 Mouse
13: 1 0 XT-PIC fpu
14: 14723228 15565900 IO-APIC-edge ide0
15: 214944 223376 IO-APIC-edge ide1
26: 14 16 IO-APIC-level aic7xxx
31: 29842668 30511470 IO-APIC-level eth0
NMI: 0
ERR: 0
The PCI Adaptec AIC-7892 Ultra 160/m SCSI host adapter comes up as IRQ 26, and the
onboard eepro100 comes up as IRQ 31.
--
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