[Linux-parport] Strange parport_pc Behaviour on 2.6.12-10 Kernel using Ubuntu 5.10

[Uwe Beutin]

Hello List.

I am trying to connect parport_pc driver to two extra parallel port
interfaces on a PCI card. So I figured (from my PCI list) that I can
simply load my parport_pc module with the following options:

parport_pc io=0x378,0x9400,0x9c00 irq=7,none,none

but alas, this does not work. So I've checked that parport_pc is loading
/dev/parport0 properly, which it does. My printer is detected and the io
address is actually 0x378:

Feb 10 10:49:29 localhost kernel: [4296258.658000] pnp: Device 00:09
activated.
Feb 10 10:49:29 localhost kernel: [4296258.658000] parport: PnPBIOS
parport detected.
Feb 10 10:49:29 localhost kernel: [4296258.658000] parport0: PC-style at
0x378 (0x778), irq 7, dma 3 [PCSPP,TRISTATE,COMPAT,ECP,DMA]
Feb 10 10:49:29 localhost kernel: [4296258.661000] parport0: Printer,
Hewlett-Packard OfficeJet Series 600
Feb 10 10:49:29 localhost kernel: [4296258.675000] ppdev: user-space
parallel port driver

But if I try to add the parport_pc modules by stating io=0x378, I get an
error saying

Feb 10 10:51:18 localhost kernel: [4296367.870000] parport 0x378
(WARNING): CTR: wrote 0x0c, read 0xff
Feb 10 10:51:18 localhost kernel: [4296367.870000] parport 0x378
(WARNING): DATA: wrote 0xaa, read 0xff
Feb 10 10:51:18 localhost kernel: [4296367.870000] parport 0x378: You
gave this address, but there is probably no parallel port there!
Feb 10 10:51:18 localhost kernel: [4296367.870000] parport0: PC-style at
0x378, irq 7 [PCSPP,TRISTATE]

So the issue is that parport_pc actually finds the port when giving no
options but does not if I give it the exact same options that it reports.

The reason for this being is that I want to add non-legacy ports from my
EXSYS card with the above mentioned addresses. Simply putting my options
as such:

parport_pc io=0x9400,0x9c00 irq=none,none

works without problems:

Feb 14 11:36:24 localhost kernel: [4294693.652000] parport0: PC-style at
0x9400 (0x9800) [PCSPP,TRISTATE]
Feb 14 11:36:24 localhost kernel: [4294693.655000] parport0: Printer,
Hewlett-Packard OfficeJet Series 600
Feb 14 11:36:24 localhost kernel: [4294693.655000] parport1: PC-style at
0x9c00 (0xa000) [PCSPP,TRISTATE]

So what could be the issue with the parallel port on my motherboard?! Oh
yes, I've tried 0x278 as well in my BIOS.

Thank you for your support,

	Uwe