I hope someone can help with this...
I have a device driver written to communicate bidirectionally to a custom
scanner. On one linux box (redhat 7.0) this works fine, on the other
(identical operating system), the driver never receives an interrupt when
nFault goes low attempting to initiate a reverse transfer. I've checked /proc
and ioports, interrupts, etc are all the same. /etc/modules.conf are
identical, kernel is identical, everything, as near as I can tell.
Unfortunately, my customer has a similar problem, one system that works, and
one that doesn't. The one that doesn't work has a removable hard drive, so
when we pull out the linux drive and insert a Windows hard disk, the
communications are fine, which indicates, I think, that it is not a BIOS or
parallel port chipset issue.
Can anyone give me a hint as to where to look? I've been pulling my hair out
over this one. I suspect that there's some flag, or option, somewhere that
will enable this bidirectional interrupts, but I'm at a loss as to what it is,
and what is happening.
Thanks,
Al Folsom
------------------------------------------------------
Al Folsom (215) 628-0840
JMI Software Consultants Fax:(215) 628-0353
Box 481, 904 Sheble Ln. folsom@jmisoftware.com
Spring House, PA 19477
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