Parport irq detection problem in 2.1.62.

Niels Kristian Bech Jensen (nkbj@image.dk)
Fri, 7 Nov 1997 11:16:56 +0100 (MET)

Hi,
I have a irq detection problem with the parallel port driver in 2.1.62.
It cannot detect my second (polling) parallel port correctly (parport1.)

Here is the logging output:
Nov 7 08:52:15 hafnium kernel: parport0: PC-style at 0x378 [SPP,ECPEPP,ECPPS2]
Nov 7 08:52:15 hafnium kernel: parport1: PC-style at 0x278, irq 0, dma 0 [SPP]

When lp is loaded it reports the printer at parport0 as polling and the
one at parport1 as interrupt-driven. I cannot print to the one at
parport1, but I get the message "Trying to free free IRQ0".

The driver is compiled as a module and was loaded by kerneld with the
following options in /etc/conf.modules:
options parport_pc io=0x378,0x278

I can print to both printers if I give these options in /etc/conf.modules:
options parport_pc io=0x378,0x278 irq=-2,-2

(-2 is the magic number for PARPORT_IRQ_NONE.)

The logging output is now:
Nov 7 08:52:15 hafnium kernel: parport0: PC-style at 0x378 [SPP,ECPEPP,ECPPS2]
Nov 7 08:52:15 hafnium kernel: parport1: PC-style at 0x278, dma 0 [SPP]

It now (correctly) reports both printers as polling.

It seems that the irq auto detection returns 0 when it should return
PARPORT_IRQ_NONE.

The driver probably shouldn't report "dma 0" but it doesn't seem to have
any effect.

--
Med venlig hilsen / Regards


Niels Kristian Bech Jensen              nkbj@image.dk
                           http://www.image.dk/~nkbj/