rtnet-developers

[RTnet-developers] RTnet Configuration Issue "Unsupported kernel version"

[James K. <jam...@gm...>]

When I try to configure RTnet using the autotools in a cross-compile
environment, I get the error "*** Unsupported kernel version".  What's
interesting is that I had this issue before, but by commenting out the
variable "CONFIG_RTNET_RTEXT_CLASSIC=y" in the configure.ac script it
could identify xenomai and the linux kernel.  This allowed me to build
valid kernel modules for arm-linux.  I committed all of the changes
into a local GIT repository and noted all of the environment variables
(PATH, CROSS_COMPILE, ARCH, etc) to ensure that I could get back to a
working build.

This most recent problem started after I rebuilt my development
machine kernel with Xenomai and RTnet so that I could properly test
the device.  Now that I go back to the cross-compile environment, I'm
running into the same problem as before, and I can verify that my
environment now to cross-compile RTnet is the same as before.

I've also tried re-running the "scripts/autogen.sh" with
"CONFIG_RTNET_RTEXT_CLASSIC=y" enabled again, but it still gives the
same error.

Finally, to my questions:  Why did I have to disable
CONFIG_RTNET_RTEXT_CLASSIC to make the build work in the first place?
Are there known issues with the autotool configuration for RTnet?  Any
ideas as to what could be going wrong?


Thanks,

- James

Re: [RTnet-developers] RTnet Configuration Issue "Unsupported kernel version"

[Jan K. <jan...@si...>]

James Kilts wrote:
> When I try to configure RTnet using the autotools in a cross-compile
> environment, I get the error "*** Unsupported kernel version".  What's
> interesting is that I had this issue before, but by commenting out the
> variable "CONFIG_RTNET_RTEXT_CLASSIC=y" in the configure.ac script it
> could identify xenomai and the linux kernel.  This allowed me to build
> valid kernel modules for arm-linux.  I committed all of the changes
> into a local GIT repository and noted all of the environment variables
> (PATH, CROSS_COMPILE, ARCH, etc) to ensure that I could get back to a
> working build.
> 
> This most recent problem started after I rebuilt my development
> machine kernel with Xenomai and RTnet so that I could properly test
> the device.  Now that I go back to the cross-compile environment, I'm
> running into the same problem as before, and I can verify that my
> environment now to cross-compile RTnet is the same as before.
> 
> I've also tried re-running the "scripts/autogen.sh" with
> "CONFIG_RTNET_RTEXT_CLASSIC=y" enabled again, but it still gives the
> same error.
> 
> Finally, to my questions:  Why did I have to disable
> CONFIG_RTNET_RTEXT_CLASSIC to make the build work in the first place?
> Are there known issues with the autotool configuration for RTnet?  Any
> ideas as to what could be going wrong?

CONFIG_RTNET_RTEXT_CLASSIC only applies to very old Xenomai version (or
to RTAI), so this is probably wrongly configured. But you did not tell
us what your Xenomai version is.

BTW, a short description how to cross-compile RTnet can also be found a
trtnet/drivers/mpc52xx_fec/README.

Jan

-- 
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux

Re: [RTnet-developers] RTnet Configuration Issue "Unsupported kernel version"

[James K. <jam...@gm...>]

Hi Jan,

Thank you for your response.

We have a custom build process that was probably confusing the RTnet
configure script, and I also just recently patched my development
machine's kernel with xenomai to test RTnet with the device--the
configuration script also seemed to want to use some of those
directories.  The resolution was to clean everything (make mrproper,
make distclean) from both the custom build and kernel/linux
directories and rebuild the kernel from the standard kernel/linux
directory, reconfigure xenomai in that directory, and then rerun the
RTnet configuration script.  Along the way, I also moved all of the
directories used for patching my development machine's kernel with
xenomai, but that probably wasn't necessary.


> CONFIG_RTNET_RTEXT_CLASSIC only applies to very old Xenomai version (or
> to RTAI), so this is probably wrongly configured. But you did not tell
> us what your Xenomai version is.

I'm running xenomai 2.4.9.1.  I'm guessing it was the same build
process confusion (files that appeared missing because they were in
other locations) that caused the configuration script to think that it
was an old xenomai patch.


> BTW, a short description how to cross-compile RTnet can also be found at
> rtnet/drivers/mpc52xx_fec/README.

I did happen upon that a few weeks ago when I was looking for a good
example of porting a driver.  Perhaps this would be a good thing for
the wiki...


Thanks,
- James