Re: parport_pc freezes my ultra 5 with 2.6 kernels

On Thursday 13 January 2005 21:44, Per Sigmond wrote:
> Anyone had this problem? The module parport_pc seems to match my parallell
> port hardware. On 2.4 kernels the parallell port works fine with this
> module. On all 2.6 kernels the port and printer is detected correctly, but
> as soon as I send any data to the printer the machine freezes. Any ideas?

After some hours of fiddling I found a solution myself, although a dirty one. 
The trick was to prevent the driver (parport_pc) from using interrupts (and 
dma). The dirty part was the way I told the module: I couldn't get it to 
accept parameters via modprobe.conf, so I  just inserted the line
 irq = PARPORT_IRQ_NONE;
in the driver code at the beginning of function 
'parport_pc_probe_port()' (near line 2167). I obviosly had to recompile the 
kernel as well. Btw, the kernel is the 2.6.8-1.571sp1 that comes with Aurora 
build-1.92.

Anyway, now it works just fine (in polling mode). Don't know if it was the irq 
handling or the dma handling that was freezing up my machine, but maybe 
someone else would know?

Regards,
Per.
-- 
Per Sigmond
Gjert Sorensensvei 5
4879 Grimstad
Norway
+47-90721913
[email protected]
http://www.sigmond.no/per
_______________________________________________
Aurora-sparc-devel mailing list
[email protected]
http://lists.auroralinux.org/mailman/listinfo/aurora-sparc-devel
Aurora FAQ: http://www.ecs.soton.ac.uk/~mas01r/aurorafaq.html