advice on using ddelinux

Björn Döbel doebel at os.inf.tu-dresden.de
Thu Aug 28 00:00:33 CEST 2014


Am 27.08.2014 um 17:02 schrieb Korbinian Ederer:
> Hello,
>
> thanks for the fast response.
>
> now I've created the include dir in the pkg/d_can folder. Then I added 
> the PRIVATE_INC_DIR variable in the Makefile of the driver, but I 
> still get the file not found error... What I'm doing wrong?

 From your description ... I don't know!

* Are the include files installed into your build directory? (Do a find 
within <builddir>/include).
* Does your compile run use the proper -I flags to get to these include 
dirs? (Do a make run with the V=1 option)

Bjoern

>
> the directory structur now looks like this:
>
> l4/pkg/dcan/:
>     -dcan/:
>         -driver C Files
>         -Makefile with the PRIVATE_INC_DIR variable
>     -include/:
>         -linux/:
>             -can/:
>                 - the additional header files
>
> thanks
>
> Korbinian
>
> Am 26.08.2014 um 14:09 schrieb Björn Döbel:
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>> On 26.08.2014 13:54, Korbinian Ederer wrote:
>>> Hello together, I just started to play with ddelinux... My Goal is
>>> to build an d_can driver for l4re.
>> Do you want to implement your own driver from scratch? In that case,
>> I'd recommend not using any Linux functionality and instead build the
>> driver on top of the respective L4Re services or using libddekit,
>> which provides convenience wrappers for this functionality.
>>
>> If you are reusing a Linux driver, DDE might be the right way to go.
>> Note, that pkg/dde/linux26 is still at Linux version 2.6.29 and you
>> will have to use the respective driver from this version to fit with
>> DDE. Otherwise you'll likely run into interface mismatches.
>>
>>> I tried to collect the important parts from the Makefiles of
>>> pkg/anghk and the ddelinux examples to write my own for d_can.
>>>
>>> when i Try to build my "puzzle" ;) i get following error:
>>> fiasco/src/l4/pkg/d_can/d_can/d_can.c:42:27: fatal error:
>>> linux/can/dev.h: No such file or directory this leads me to the
>>> fear that there's no can/dev.h in ddelinux...
>> If there's no linux/can/dev.h in ddelinux, you will probably have to
>> add it either to l4/pkg/dde/linux26 or to your own pkg directory.
>>
>> In any case, you put the missing header files into some place and then
>> use L4Re's build system to install the headers properly and to find
>> them while compiling your applications.
>>
>> * An example for installing headers can be found in
>> pkg/dde/linux26/include/Makefile
>>
>> * All DDE drivers are supposed to include pkg/dde/linux26/Makeconf
>>    in their Makefile. This file sets up a Linux-specific compile
>>    environment. For the case of your additional headers you would
>>    include this file and then add your newly created private header
>>    dir to the PRIVATE_INC_DIR make variable.
>>
>>> PS: Sorry for the large appendix, but I think it's important for
>>> the problem.
>>>
>>>
>>>
>>> my pkg folder structure looks like this:
>>>
>>> l4/pkg/d_can: -./Control -./Makefile -d_can/: -./d_can.c
>>> -./d_dcan.h -./d_can_platform.c -./Kconfig -./Makefile
>> What would you need the Kconfig file for?
>>
>>
>>> The contents of the files:
>>>
>>> l4/pkg/d_can/Control:
>>>
>>> /provides: d_can// //requires: dde-linux26 dde-linux26_net/ / /
>>>
>>>
>>>
>>>
>>> l4/pkg/d_can/Makefile:/ // //PKGDIR ?= .// //L4DIR  ?=
>>> $(PKGDIR)/../..// // //include $(L4DIR)/mk/Makeconf// //-include
>>> $(PKGDIR_OBJ)/Makeconf// // //#ifeq ($(CONFIG_DDE26),y)// //TARGET
>>> = d_can// //#endif// // //include $(L4DIR)/mk/subdir.mk/
>> I think there's no need for the CONFIG_DDE26 check?
>>
>>
>> Bjoern
>>
>> - -- Dipl.-Inf. Bjoern Doebel    Mail:  doebel at tudos.org
>> TU Dresden, OS Chair        Phone: +49 351 463 38 799
>> Noethnitzer Str. 46         Fax:   +49 351 463 38 284
>> 01187 Dresden, Germany      WWW:   http://www.tudos.org/~doebel
>> - -- 
>> "When the seagulls follow the trawler, it's because they think
>>   sardines will be thrown into the sea." (Eric Cantona)
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>> =joNi
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