IRQ assignment on my IBM X24

[Eric W. Biederman]

ron minnich <rminnich at lanl.gov> writes:

> this seems really poor bios design:
> @mini rminnich]#  lspci -v -v | grep Interrupt
>         Interrupt: pin A routed to IRQ 11
>         Interrupt: pin B routed to IRQ 11
>         Interrupt: pin C routed to IRQ 11
>         Interrupt: pin A routed to IRQ 11
>         Interrupt: pin B routed to IRQ 11
>         Interrupt: pin B routed to IRQ 11
>         Interrupt: pin B routed to IRQ 11
>         Interrupt: pin A routed to IRQ 11
>         Interrupt: pin A routed to IRQ 11
>         Interrupt: pin B routed to IRQ 11
>         Interrupt: pin A routed to IRQ 11
>         Interrupt: pin A routed to IRQ 11
> 
> Pretty much everyone goes to IRQ 11.
> 
> And a bunch of Interrupts go unused:
> 
>            CPU0       
>   0:    3381694          XT-PIC  timer
>   1:      13873          XT-PIC  keyboard
>   2:          0          XT-PIC  cascade
>   8:          1          XT-PIC  rtc
>  11:      77842          XT-PIC  usb-uhci, usb-uhci, usb-uhci, eth0, 
> wlan0, Ricoh Co Ltd RL5c476 II, Ricoh Co Ltd RL5c476 II (#2)
>  12:     360259          XT-PIC  PS/2 Mouse
>  14:      85559          XT-PIC  ide0
> NMI:          0 
> ERR:          0
> 
> 
> Is there any reason a BIOS would do this?

The motherboard is a lousy design.    Only vary rarely
have I not seen the basic irq assignments come down to traces
on the motherboard.

Eric