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strange IRQ/AGP problem

strange IRQ/AGP problem

Post by Mar » Fri, 11 Dec 1998 04:00:00



I have a strange (to me) IRQ problem.


"Mach64 GB (rev 92)" in the AGP slot, and a "3Com 3C905B 100bTX (rev
48)" in a PCI slot. (I had the same problem with an Intel 10/100 "82557
(rev 05)")

The problem:
Whichever IRQ the NIC gets, the video card gets.  I tried moving the NIC
to a different slot.  I set the offending IRQ to Legacy/ISA, a different
IRQ is then shared between them.

X-Windows works fine, but svgalib apps and SVGATextMode don't work.  The
NIC's work fine.

This is with kernel 2.0.35 (Caldera 1.3)  And 3 different versions of
svgalib.

Thanks in advance for any insight.

Mark

--
please reply to mark AT shad DOT net

 
 
 
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strange IRQ/AGP problem

Post by Baliza » Sat, 19 Dec 1998 04:00:00


Try changing your BIOS to specify the different IRQ's for your cards. This
typically works when problems like this occur.
Balizar

> I have a strange (to me) IRQ problem.


> "Mach64 GB (rev 92)" in the AGP slot, and a "3Com 3C905B 100bTX (rev
> 48)" in a PCI slot. (I had the same problem with an Intel 10/100 "82557
> (rev 05)")

> The problem:
> Whichever IRQ the NIC gets, the video card gets.  I tried moving the NIC
> to a different slot.  I set the offending IRQ to Legacy/ISA, a different
> IRQ is then shared between them.

> X-Windows works fine, but svgalib apps and SVGATextMode don't work.  The
> NIC's work fine.

> This is with kernel 2.0.35 (Caldera 1.3)  And 3 different versions of
> svgalib.

> Thanks in advance for any insight.

> Mark

> --
> please reply to mark AT shad DOT net


 
 
 
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1. Micron AGP/PCI ethernet IRQ overlap problem

Problem:

I have a Micron Millenia XSU Pentium II/266 system with a Diamond Viper
V330 AGP graphics board at work. The application for which this was
purchased is going to require me to install two ethernet controllers, in
this case the 3COM Fast Etherlink (3C905-TX) PCI controller. I would
like to be able to run X-windows on this system. The X servers available
for the Riva128 (XFree86 and Xsuse) require that no interrupts be shared
in a system between the graphics board and any other devices. This is my
problem. If I install both ethernet cards, inevitably either one or both
of them is assigned IRQ9, which is the same as the graphics board. I
have followed the bizarre procedure outlined by Micron tech support to
reassign IRQs, which involves removing all boards, powering up & down
the system, and then putting them back one by one. What I ended up with
after doing this was exactly what I started out with in the first place.
The AGP board and both ethernets all got IRQ9. The best I have been able
to do is to get one ethernet to IRQ11 by putting it in the shared
ISA/PCI slot, but if I put the second board back in a normal PCI slot it
still gets IRQ9. Is there any solution to this problem? IRQ10 is unused,
but it seems impossible to get the BIOS to assign it to a PCI device in
this system.

Andy Wolff

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