[linux-yocto] Beaglebone Black BSP CAN bus activation

[Lukas Böhm]

Am 20.01.2015 um 16:58 schrieb Bruce Ashfield:
> On 15-01-16 08:58 AM, Lukas Böhm wrote:
>> Hello,
>>
>> I hope this is the correct destiantion list for Yocto-BSP-Questions.
>
> It's a good starting point. General questions for the supported BSPs in
> linux-yocto tree can typically be answered here .. but if we get into
> particulars and variants of the boards, there are maintainers and other
> lists that are better suited.
Thanks for your answer so far! The next questions are quite general to 
the yocto/oe mechanism.
>
>> I am new to Yocto and trying to build a core-image-base (daisy branch)
>> with some additional packages for the Beaglebone Black. This works quite
>> fine so far.
>> Now I stuck in activation of the 2 DCAN controllers on the device.
>> I added the drivers for DCAN in the linux-yocto kernel (with menuconfig)
>> and and added iproute2, libsocketcan and canutils to the recipes but no
>> can0 device comes up.
>
> Anything in the dmesg about the device ? Are you building them as modules,
> or into the kernel ?
Nothing in dmesg. I build them into the kernel. But I can say it works 
on the official Debian distro with device tree overlays. But I don't 
want to use the cape manager from there but have it running right out of 
the box.
>
>> I considered now that probably the devicetree has to be configured as
>> well but don't know how to do this nicely.
>
> You can see the device tree that is currently being built in the
> meta-yocto-bsp beaglebone.conf file. Those dts files are in the kernel
> themselves, so you can edit them and rebuild .. or patch them to have
> the missing elements.
>
The KERNEL_DEVICETREE variable points to dtb files. Does this mean that
they are precompiled and I may change them to the dts equivalents 
including my patches? How to rebuild them with bitbake?

> It is also worth checking https://github.com/beagleboard/meta-beagleboard
> for configuration tips, and the mailing list referenced in the README
> for more detailed questions/information/archived responses.
>
> Bruce
>
>> Am I right or are ther other things to consider?
>> I am thankful for any help!
>>
>> regards Lukas
>

regards
Lukas