Re: [Xenomai] Cross-compiling RTDM driver errors

[Stefan Videv <videvstefan@gmail.com>]

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

-- Stefan

> Also, I have a user space program that I then converted to the kernel 
> module that I am now trying to compile. That runs perfectly fine on my 
> kernel. Is that possible? Is the kernel missing support for these 
> operations, but you can do that fine from user space?
>
> Thanks, again!
>
> -- Stefan
>>
>>>
>>> I am using the Makefile provided with the examples and compiling 
>>> like so:
>>>
>>> make XENO=/media/rootfs/usr/xenomai/ ARCH=arm 
>>> CROSS_COMPILE=arm-linux-gnueabi- KSRC=~/beagle/linux/ 
>>> DESTDIR=/media/rootfs ADD_CFLAGS=-I/usr/arm-linux-gnueabi/include
>>>
>>>
>>> Thanks!
>>>
>>> -- Stefan
>>
>