I knew sooner or later I'd get a bite on this one...
No, IRQ allocation is set by the BIOS (or the OS) during boot.
While you can set WHICH irq is allocated to a group of cards, YOU CANNOT set
individual IRQ's for a particular card.
Huh? Sure I can, you say...
NO!
PCI cards are hardwired to the IRQ service levels. Normally more than once
card is wired to each line. Thus you'll have a pair of PCI slots (or in some
cases up to three) which share the SAME IRQ's.
No matter what you do with the BIOS you'll be unable to disable the sharing.
Say you have a NIC card using IRQ-10 in slot two, and a NIC card in Slot 5
which you discover also is sharing the same IRQ.
Linux doesn't like this... ok, so you go into the bios and try to set the
IRQ allocation for slot two... well guess what happens, it also changes for
slot 5!
If you are lucky you will not have a sharing issue, if not all your slots
are filled.
In the original posters machine, all his slots are full and he cannot get
around his two NICs using the same IRQ. He can move one of them to another
slot, possibly causing another sharing situation.
Under certain conditions sharing is ok, so by moving his cards around he can
fix the problem.
Though your milage may vary depending upon driving conditions...
-JMS
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Abraham Pinzur
Sent: Wednesday, December 06, 2000 10:43 AM
To: [newbie] Linux-Mandrake
Subject: RE: [newbie] Resolving resource conflicts in Mandrake 7.2
complete
> In most computers IRQ allocation on PCI cards is SLOT dependant.
My Award BIOS lets me manually set the IRQ assigned to each slot.
- Av -
--
Abraham P. (Av) Pinzur
[EMAIL PROTECTED]
http://www.crispgraphics.com/~newav
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Jose M. Sanchez
> Sent: Wednesday, 06 December, 2000 02:34
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Subject: RE: [newbie] Resolving resource conflicts in Mandrake 7.2
> complete
>
>
>
> In most computers IRQ allocation on PCI cards is SLOT dependant.
>
> I'm sure a few people here will think otherwise, but it's true.
>
> You can change the IRQ both cards will use, but the change will occur in
> unison... I.E. both will go to 10 at the same time, etc.
>
> What you need to do, is move one of the cards to another PCI card slot.
>
> Some vendors now provide "maps" of the IRQ allocations on a per slot
> basis...
>
> I wish they all would to clarify things for a lot of people...
>
> For example the AGP slot and the first slot (closest to the AGP slot)
> normally share the same IRQ no matter what you do.
>
> Slot two w/slot 5, etc... actual hardware may vary...
>
> -JMS
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Mark Lee
> Sent: Tuesday, December 05, 2000 2:27 PM
> To: '[EMAIL PROTECTED]'
> Subject: [newbie] Resolving resource conflicts in Mandrake 7.2 complete
>
>
> Hi,
>
> I'm new to the list and have a question regarding resource conflicts in
> Mandrake 7.2 Complete.
>
> I have a system that I built, to act as a gateway/firewall for my cable
> modem. The components are as follows :
>
> ASUS P5A B motherboard with 1010 Bios version
> 64MB PC 100 RAM
> Diamond Viper 550 PCI video
> Creative 24X IDE CD ROM
> Creative SB 16 ISA card
> 2 x 3COM 3c509B TX PCI NIC cards
>
> My problem is that when I look in DrakConf at the NIC properties there are
> Splat marks (!) on both NIC cards. A look at the properties reveals that
> both cards are attempting to use the same memory resources (both
> are set to
> use IRQ9). The change resources button is grayed out so it
> doesn't look like
> I can set the properties (or test different resources) here.
>
> I'm guessing that I need to change something in the BIOS. Does anyone have
> any suggestions on the best way to get round this problem ?
>
> Thanks, in advance,
>
> Mark Lee
>
>
