Does PCI VGA card always have IRQ?

Does PCI VGA card always have IRQ?

Post by Georg Schwa » Thu, 30 Jul 1998 04:00:00



I've got a 486 w/ PCI running Linux 2.0.35. The following PCI devices are
recognized:

helena schwarz 504 (~): cat /proc/pci PCI devices found:
  Bus 0, device 18, function 0:
    ISA bridge: UMC UM8886A (rev 1).
      Medium devsel.  Master Capable.  No bursts.
  Bus 0, device 16, function 0:
    Host bridge: UMC UM8881F (rev 1).
      Medium devsel.  Master Capable.  No bursts.
  Bus 0, device 13, function 0:
    VGA compatible controller: S3 Inc. Trio32/Trio64 (rev 0).
      Medium devsel.
      Non-prefetchable 32 bit memory at 0xff000000.

What puzzles me is that there's no IRQ given for the VGA card.
/proc/interrupts looks as follows:

helena schwarz 505 (~): cat /proc/interrupts
 0:  1549821 timer
 1:  1302 keyboard
 2:  0 cascade
 4:  20363 + serial
11:  239467 WD8003-old
13:  1 math error
14:  115940 + ide0
15:  290283 + ide1

Is it possible for the VGA card to nevertheless use an IRQ, which
could lead to occasional conlicts with, e.g., the ethernet card?

I find it astonishing to see that the same type of graphics card (maybe
with some different ROM version) does give an IRQ on a Pentium also
running Linux 2.0.35:

milli2 (~):cat /proc/pci
PCI devices found:
  Bus 0, device 11, function 0:
    VGA compatible controller: S3 Inc. Trio32/Trio64 (rev 84).
      Medium devsel.  IRQ 11.
      Non-prefetchable 32 bit memory at 0xf4000000.
  Bus 0, device 7, function 1:
    IDE interface: Intel 82371SB PIIX3 IDE (rev 0).
      Medium devsel.  Fast back-to-back capable.  Master Capable.
Latency=32.
      I/O at 0xe800.
  Bus 0, device 7, function 0:
    ISA bridge: Intel 82371SB PIIX3 ISA (rev 1).
      Medium devsel.  Fast back-to-back capable.  Master Capable.  No
bursts.
  Bus 0, device 0, function 0:
    Host bridge: Intel 82439HX Triton II (rev 3).
      Medium devsel.  Master Capable.  Latency=32.

What might be the reason? Is it due to the board? Or due to the graphics
card?
--

Institut fr Theoretische Physik  +49 30 314-24254   FAX -21130  IRC kuroi
Technische Universit?t Berlin            http://home.pages.de/~schwarz/

 
 
 

Does PCI VGA card always have IRQ?

Post by Spree » Thu, 30 Jul 1998 04:00:00




Quote:> Is it possible for the VGA card to nevertheless use an IRQ, which
> could lead to occasional conlicts with, e.g., the ethernet card?

Well, some boards can be configured not to assign an IRQ to the
display adapter... Like mine... It's configured in the BIOS...

PS But SOME displays NEED an IRQ to work...

--
Spree                < Remove "nospam#" for email >

 
 
 

1. PCI ethernet card shares irq with PCI scsi card

Hallo,

I've got a problem getting my network up and running.
When I want to put my eth0 up (compex PCI card using ne2k-pci) I got a
siocsifflafs:try again error. I found out that it had something to do with
irq's. A cat /proc/interrupts shows me that the PCI NCR810 scsi card was on
that IRQ. In windows everything works fine, so I figured linux could do it
to.
I did some research and found that the scsi driver needed some modifications
(something with SA_INTTERUPTS that need to be remnoved). I tried it, but it
failed (compilor errors). Can someone help me out on this on?

changing irq's isn't possble, since I dont have that option in my BIOS and
besides, I dont have any other free IRQ left...    Please help!

Vincent

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