On 11/05/2012 06:50 PM, Gilles Chanteperdrix wrote:
On 11/05/2012 07:00 PM, Stefan Videv wrote:
On 11/05/2012 05:33 PM, Stefan Videv wrote:
On 11/05/2012 05:19 PM, Stefan Videv wrote:
On 11/05/2012 05:13 PM, Stefan Videv wrote:
Hi,
I am trying to cross compile a driver that I wrote which is very
similar to the one provided in the examples (tut02-skeleton-drv).
I've basically changed the write function to do what I am interested
in doing, everything else is the same (however I am not providing a
read function).
During compilation I get the following error:
FATAL: modpost: GPL-incompatible module vlcTxDriver.ko uses GPL-only
symbol 'rtdm_dev_unregister'
What's that supposed to mean, and how do you get around it?
I answered my own question just now -- I've forgotten to define the
module licence correctly. Having done that I end up with some
undefined symbols, just like when trying to compile the POSIX examples.
Here's what I get:
WARNING: "pse51_shm_close" [/home/stefan/VLCTxDriver/vlcTxDriver.ko]
undefined!
WARNING: "munmap" [/home/stefan/VLCTxDriver/vlcTxDriver.ko] undefined!
WARNING: "mmap" [/home/stefan/VLCTxDriver/vlcTxDriver.ko] undefined!
WARNING: "open" [/home/stefan/VLCTxDriver/vlcTxDriver.ko] undefined!
Any help is appreciated! Thanks!
I've somewhat answered my questions again:
http://www.xenomai.org/pipermail/xenomai-help/2011-12/msg00014.html
However, I still do not understand how do you go about enabling these
features (i.e. what to enable when configuring my kernel).
I've enabled shared memory support from the POSIX options for Xenomai.
That takes care of the first 3 warnings.
However, I am still having the last one. I am trying to use this
particular open() function:
http://pubs.opengroup.org/onlinepubs/000095399/functions/open.html
to be able to write to /dev/mem
You do not write to /dev/mem in a kernel module. You use ioremap.
Great point :) Everything works now (well apart from the fact that I am
not sure I am writing to the correct registers when using ioremap and
iowrite, but that's outside the scope of this mailing list :) ).
Thanks!
-- Stefan
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