Matthew Vanecek (mev0003@unt.edu)
Sat, 22 May 1999 07:00:14 +0000
David Campbell wrote:
>
> Hmm... I need to check the driver code but the symptom would match
> the ZIP drive grabbing hold of the parallel port and not letting go.
> You may want to check the /proc/parport entries and see which device
> the parport believes owns the parallel port.
Attached below is a script of the 'cat's of parport/0/*. Dunno if it
would help. Tim Waugh has copies of my dmesg/module loading output, but
I could run it again for you, if you'd like.
>
> When you say "if I then power off the Zip drive and power it on", is
> this while the ZIP disk is mounted (but no access). I am trying to
> figure out if this is a hardware or software issue (hardware would
> definitely be my responsibility, software would probably be something
> has slipped in the parallel port sharing code).
>
Doesn't matter if it's mounted or not. Once I insmod ppa, printing
stops. If I mount or don't mount, once I unplug and plug back in the
Zip's power cord, printing starts again. Until I do something that
accesses ppa/the zip drive, at which point printing stops again.
Of course, if the Zip is mounted when I power it off, I get an I/O Read
error when accessing the mountpoint, for some reason. ;)
> > I've only tried kernels 2.2.6 - 2.2.9. I've also tried Dave Campbell's
> > updated ppa.c/ppa.h/imm.*, etc, (which came out, what, yesterday?
> > Wednesday?) with exactly the same results.
>
> Friday morning (Australian time), there will some people who think it
> is still Friday night...
>
> > The problem is the same in both EPP and EPP+ECP mode.
>
> The problem will be mode independent, it is more a problem of either:
> a) ZIP drive has not gone back into pass through mode
> b) parport and dependent drivers has slipped a cog in the
> sharing code
>
Well, I wish I knew enough to help track the problem, but I'm only on
Ch. 4 of "Beginning Linux Programming" (Wrox Press). Now, if the driver
were (or could have been) written in COBOL...
I like option a, especially since I know nothing about the code in
option b.
-- Matthew Vanecek Course of Study: http://www.unt.edu/bcis Visit my Website at http://people.unt.edu/~mev0003 For answers type: perl -e 'print $i=pack(c5,(41*2),sqrt(7056),(unpack(c,H)-2),oct(115),10);' ***************************************************************** For 93 million miles, there is nothing between the sun and my shadow except me. I'm always getting in the way of something...-- To unsubscribe, send mail to: linux-parport-request@torque.net -- -- with the single word "unsubscribe" in the body of the message. --
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