Re: [RTnet-users] RTnet on Beaglebone Black

[Gilles C. <gil...@xe...>]

On 06/30/2014 06:24 PM, Hidde Verstoep (E2M) wrote:
> Hello,
> 
> I'm trying to get RTnet to work on the Beaglebone Black (BBB).
> However, I have come to a point where I don't know how to proceed. I
> think here is a good place to ask the questions I have.
> 
> Installing Xenomai was quite simple using this tutorial:
> http://brunosmartins.info/xenomai-on-the-beaglebone-black-in-14-easy-steps/.
> I only deviated from these steps to ensure I compiled the the network
> driver components as modules.
> 
> There are three modules for the network driver (as far as I can tell).
> Loading the non-RTnet modules goes as follows:
> $ modprobe smsc
> $ modprobe davinci_mdio
> $ modprobe ti_cpsw
> Insert the network cable, and after a while the link comes up and
> everything works fine. See dmesg output in the attached file
> ticpsw.log.
> 
> My ported version for the modules (as well as the r8169 driver I
> ported earlier) can be found here:
> https://github.com/hiddeate2m/rtnet/tree/master/. This is the entire
> RTnet source tree. The specific modules can be found in
> drivers/rt_smsc.c, drivers/rt_davinci_mdio.c and drivers/ticps/. The
> modules can be build and installed as usual.
> 
> Loading the modules ported to RTnet is similar:
> $ insmod modules/rtnet.ko
> $ insmod modules/rt_smsc.ko
> $ insmod modules/rt_davinci_mdio.ko
> $ insmod modules/rt_ticpsw.ko
> $ ./sbin/rtifconfig rteth0 up
> Insert the network cable. When the link comes up after a while the BBB
> freezes completely. All the dmesg output I managed to capture can be
> found in the attached file rt_ticpsw.log.
> 
> One important difference between the logs is of course the WARNING
> from ipipe.c. I searched the file, but could not find out if this is
> important or not. Does anyone know?

The warning comes from the fact that you are running an SMP kernel on a
machine with only one processor. You can avoid it by compiling without
CONFIG_SMP. Another advantage of disabling CONFIG_SMP is that you will
gain better performances.

-- 
                                                                Gilles.