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.
--
Gilles.
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