Greetings all. I am a relative new-comer to parallel port interfacing and,
for that matter, a new-comer to LINUX also.
Maybe this isn't the place to ask my question but I seem to have exhausted
-all- other avenues. You'll tell me I'm sure(!).
I have written a bespoke ioctl() to communicate with a laboratory testing
device (length of wool fibres). It only partly works because, I think, the
kernel parallel port driver/module is clobbering it:
If I toggle the input _ACK line low, without my code running on LINUX, the
_STROBE output toggles with it. Not quite in sync, there's a ca. 5uS delay.
One oddity is that my ioctl_foo_init() code allows me access to the Extended
Control Register(s) and I can read the ECR as 0x35 - the default. But when I
unload the ioctl_foo() I get a message in syslog telling me that the address
space (at 0x778-77a) isn't valid.
1) can I disable the parallel port driver without recompiling the kernel?
- if not -
2) do I need to recompile the kernel without parallel support?
- if so -
any suggestion as to the best place to look for (de)selecting kernel
modules at compile time?
There's plenty of information on compiling the kernel but little I could find
on module selection.
One more thought - I considered PLIP as a possible option but the suggestion
is that it is now deprecated. Is this a common thought?
Any help appreciated. I really don't want to be driven back to that other
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