Hi, I'm a little new here, please forgive me if is old hat to some of you.
I've done my best searching the mailing list archives to see if I could
find a solution to my problem.
I'm writing a parallel port driver under RTAI 1.3 (redhat kernel
2.2.14-5.0). I'm noticing that as soon as the kernel unpacks and tbe boot
process begins, the data lines on the parallel port start thrashing like
crazy. The control lines are quiet, however.
At first I thought something was mirroring the system console to the port,
but now I suspect that it's the IDE channel doing it. This is on a
SuperMicro 370 ATX motherboard. Every keystroke or little bit of IDE
traffic moves the data lines around. When I start rtai_sched, the port
begins to scream as well. I've rebuilt the entire kernel with ALL parallel
port modules (paride, parport) turned off and it STILL happens! I've even
tried moving the parallel port IRQ to 5 in the BIOS.
I've seen previous messages referring to the fact that the parallel port
soaks up all spurious interrups that the system may not catch, but then
again I don't see this behavior in DOS at all. The port is quiet through
the entire boot process, which is what I need to make my hardware happy.
So, my questions:
1) Could something still be mirroring the console to the parallel port?
All versions of the kernel I try seem to do this during boot/init and
runlevel 3.
2) Why is rtai_sched messing with the port?
3) How can I start to fix this?
Thanks in advance for any help you all can offer...
Louis Koziarz
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