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SubjectRe: Interesting tidbit: NetMos 9835 card, IRQ, and ACPI
On Thu, Mar 24, 2005 at 10:02:05PM +0300, Michael Tokarev wrote:
> Found an interesting issue here.
> HP ProLiant ML150 box (dual xeon 2.4GHz) with intel
> chipset (lspci output below) and NetMos PCI 9835
> Multi-I/O Controller.
> Boot with no fancy options on kernel command line.
> # cat /sys/bus/pci/devices/0000:01:00.0/irq
> 11
> # modprobe 8250
> # setserial /dev/ttyS2 irq 11 port 0xa400 autoconfig
> the serial port does not work: close'int the file
> after writing something stalls for a while, and nothing
> gets written. Ok.

setserial shouldn't be used to configure PCI-based serial ports. It's
expected to fail. 8)

> # rmmod 8250
> # modprobe parport_pc
> ACPI: PCI interrupt 0000:01:00.0[A] -> GSI 18 (level, low) -> IRQ 193
> # cat /sys/bus/pci/devices/0000:01:00.0/irq
> 193
> # rmmod parport_pc # as it will conflict with 8250 here
> # modprobe 8250
> # setserial /dev/ttyS2 irq 193 port 0xa400 autoconfig
> now the serial port works.

That's because parport_pc seems to think it should be driving this
combination serial/parallel device. That's actually something that
parport_serial should be doing, and there's a patch in -mm to fix

However, this patch seems to claim that the 9835 is not supported
by anything in the kernel at present, so how is parport_pc finding
your card? Have you applied any patches?

> BTW, we have another prob with this very Netmos card and this very
> machine: sometimes, the whole machine hangs hard when using serial
> driver, so only power button helps. Happens with 2.4.* kernels
> (it assigns IRQ18 to the card) and with earlier 2.6.x kernels.
> Dunno if the two are related.

That's a separate problem.

Russell King
Linux kernel 2.6 ARM Linux -
maintainer of: 2.6 Serial core
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