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Old 08-19-2001, 10:40 PM   #1
zhenwu
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Registered: Jul 2001
Location: Taiwan (ex-Victoria BC)
Distribution: RH 9.0
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IRQ conflicts?


Hello there,

I have a strange, intermittant problem.

I often get an error upon boot up, particularly if the computer 'hangs' for more than a few seconds (14 to be exact). I then get an error referring to a DMA_irq_timeout. I don't have the exact error in front of me, but it often happens and I don't know what it is. I also get the error if installing an RPM takes longer than that 14 seconds....it's very irritating.

Tonight I did a dmesg, and I see in the list that there are two PCI devices with the same IRQ, and I"m wondering if that is the issue.

How do I check what device has which IRQ in Linux, and is there a way to manually change the IRQ's for devices?

Thanks for your help.
 
Old 08-20-2001, 05:38 AM   #2
unSpawn
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first of all I would check if one of ure BIOS options called something like "Plug and Play" is set *on*. Turn it off to let Linux handle the distribution of resources (of which it is dastardly well capable, if I may say so).

The DMA, Irq and IOports are all cattable from /proc. If u want to use a simple cli tool for overview, install "si" (freshmeat.net).

Ive had these probs under 2.2.18 when I a bad mix of UDMA/PIO4/PIO3 devices, fixed it somehow by letting the BIOS settings for UDMA on "auto", regrouping the PIO3/4 devices on one chain and the ATA hd on the other, and using hdparm for optimizing.

HTH, somehow.
 
  


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