Folks,
This group was instrumental in helping me get my first-ever
linux/PCI-bus device driver working last year, and I'm back for
some more help if you are willing.
I have a PCI card that generates an interrupt when it completes
a DMA transfer to the PCs RAM.
This works just fine on a Dell 4400 running 2.6.10-1.766_FC3
When I try to run the driver on a Dell 2300 FC2/2.6.5-1.358smp
or a Sun W2100Z running FC2/2.6.10-1.14_FC2smp I can see the
DMA-done bit set in the device, but my interrupt service routine
never gets called.
On the Sun, I booted with "noapic" option, and it booted OK,
but then when my device generated an interrupt, there was a
kernel message about Disabling IRQ #5 and the system was hung
solidly.
I think this has something to do with the different interrupt
hardware on the more advanced servers compared to my desktop
Dell 4400, and I somehow need to "enable" the IOAPIC system
so that my interrupt gets through to my service routine, but I
don't know how.
I tried grepping through the kernel/drivers source, and I didn't
find anything that jumped out at me.
The Rubini drivers book didn't help in this area either,
although it's a wonderful book in other areas.
I can post source somewhere if it will help.
I can also post the essential bits from /var/log/messages about
all the incredibly complicated IOAPIC configuration stuff.
Thank you for your past help, and thank you in advance for any
tips you can provide.
-Alan
--
- Alan Kilian <kilian(at)bobodyne.com>
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