On Sun, Sep 12, 1999 at 08:08:03PM -0700, David Lawyer wrote:
> Are your new serial ports on the PCI bus?
I imagine, but how would I know?
>
> I've heard of others that have had problems with PCI. I've emailed Ted
> Ts'o asking if there could be a problem with the serial driver in dealing
> with PCI ports. No response yet. I think that a driver for PCI ports
> needs to be written a little diffently (than for ISA) since it's supposed
> to handle IRQ sharing for the PCI which is not the same as the sharing on
> the ISA bus. Vern, do you have any info on this?
There is no IRQ sharing going on AFAIK (but it sure was suspicious that only
one serial interrupt showed up in /proc/interrupts wasn't it?). At least
setserial reports that they're using IRQs 3 and 4 and nothing else seems to
be using those interrupts.
In the BIOS setup there are only the usual 4 choices for port and IRQ for
each port, there wasn't an option to use other IRQs besides 3 and 4; I would
think PCI would allow more flexibility than that.
I solved the problem with a kludge for now: I installed an ISA 16450 card
for ttyS0, and disabled the built-in ttyS0 in the BIOS, and it worked first
time with no changes other than reverting back to the manual configuration
options in the startup script. So after a month my packet radio stuff is
finally back on the air. But I shouldn't have to do this.
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