On Mon, 2006-10-09 at 15:07 -0400, Lee Revell wrote: > On Mon, 2006-10-09 at 14:46 -0400, Paul Davis wrote: > > its basically not possible. PC architecture has changed quite a lot in > > the last few years, and AFAIK you can no longer get the kernel to change > > IRQ assignments. it seems stupid, i know, but i dug into this rather > > deeply a year or so back, and basically the kernel picks up the IO-APIC > > routings and does not modify them, even with the many flags that appear > > to be related to possibly modifying them :( there is a really cool perl > > script that actually analyses IO-APIC routings via the /proc filesystem, > > and it confirmed for me what i was worried about. > > > > if your BIOS doesn't allow it, you're out of luck *AFAIK*. if i am > > wrong, i will be happy to hear more, since i face similar issues on my > > laptop. > > Has it ever been possible to change the IRQs of onboard devices? I > thought it was hard wired. the wiring into the IO-APIC is board-level, but the IO-APIC is programmable and thus you can change the actual IRQ that the device generates, in theory. however, the kernel at this time doesn't contain code that tries to reprogram the IO-APIC in this area of its function, so you get what it gives you. i believe.
