Messages in this thread | | | From | (Andrew Walker) | Subject | Re: IRQ 2,9 | Date | Wed, 12 Feb 1997 12:45:03 +0100 (MET) |
| |
. Tethys " SYSTEM ADMIN " X wrote: > > > > Hmmm. This reminds me. When I wanted to add a network card, I needed > to find a free IRQ. I checked /proc/interrupts to see what was being > used, but it didn't report all the currently used IRQs. Specifically, > it missed out a serial port, parallel port, floppy controller and > possibly a few others. I had to resort to MSD to find out what I was > using where (and I don't entirely trust MSD anyway). > > So, is there a reason why this information is incomplete (as at 2.0.27 > on x86 -- I haven't checked since then)? > > Tet
Well, for the serial ports (yawn! have we got to say this again), the interrupt isn't reserved unless the serial port is in use. The driver won't grab irq 4 or 3 (or whatever) until it needs it. That's a design feature, not a bug.
By default, the parallel printer driver doesn't use interrupts, so it won't grab irq 7 or 5 (or whatever) unless you
a) load the lp driver - if its a module and b) tell it to use interrupts
That's another design feature, not a bug.
-Andy
-- Andy Walker Kvaerner Engineering a.s. Andrew.Walker@lysaker.kvaerner.no P.O. Box 222, N-1324 Lysaker, Norway
......if the answer isn't violence, neither is your silence......
(pwei barmy army - oslo "filial")
| |