Re: Resources for Linux SocketCAN

Am Freitag 01 Februar 2013, 01:09:27 schrieb Bram Kerkhof:
> The can4linux API seems to be a way better match for my needs than the
> convoluted SocketCAN stuff, but I have the impression that the build process
> needs a fair bit of hand waving and polishing... If I want even a shadow of
> hope that the kernel guys include this in their precious build environment,
> some major trimming needs to be done; ideally it should be a neat and tidy
> buildroot package for my target platform (iMX25@400Mhz), and play nice with
> Crosstool-NG.
> 
> You don't happen to have experience with buildroot? ;-)
> 
> Cheers,
> Bram


Hello Bram,
I have heard about Buildroot but was not aware that it might be
a good means to provide a kernel driver prepared or wrapped with it.
At the moment the build system of a can4linux driver consists of
the sources (of course) a Makefile and a script to set the environment
to build the driver outside of the kernel.
The following is part of the README.xcanps.zynq
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Compiling:
===========================================================================
Get the sources
svn co https://can4linux.svn.sourceforge.net/svnroot/can4linux/trunk trunk
cd to can4linux.
Edit cross-zedboard according to your environment
(kernel sources, cross-compiler and other tools location,..)
Source this environment before calling make.
Use the target specific Makefile-zedboard.
Take care to set the -DCAN_SYSCLK according the settings in XPS
with the CAN module input frequency. Bit-timing tables are provided
already for some input frequencies. It is suggested to use 20MHz.

Copy the canflinux.ko kernel module to the ZedBoard Linux 
/lib/modules/`uname -r`/
call
# modprobe can4linux
It will result in a loaded kernel module and two device entries
/dev/can[01]
   ...
   ...
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

As you can see, that's not 
not very difficult to set up.
If you have difficulties with the i.MX25, let me know, I'll help.

Regards
    Heinz



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