On 01.10.19 15:26, François Legal wrote:
Hello,
Could you please clarify what "upstream" is ? RTNet project ? There does not
seem to be activity there since 2012 ?
RTnet was merged into Xenomai 2014. I thought you knew when you were posting
here ;).
I'll be happy to contribute on this. You mention "glue scripting", could you be
more precise to let me try to fix that part too.
xenomai/utils/net/rtnet.in. But I suspect that will be rather simple.
More tricky is a stable init ordering, ideally something that does not depend on
link ordering. And maybe there is more.
Shall I send the patch to this list ?
Exactly. Against the master branch. If it's a fix, we can consider backporting
to 3.0.x and 3.1.x (3.1 is already in feature freeze state).
Jan
Thanks
François
Le Mardi, Octobre 01, 2019 15:10 CEST, Jan Kiszka <[email protected]> a
écrit:
On 01.10.19 15:04, François Legal via Xenomai wrote:
>
> Hello list,
>
> I've been struggling to get the RTNet + RTIPv4 part to work on a Zynq 7000
board. Using source code from stable Xenomai 3.0.9 tarball, and patching a
vanilla 4.4.189 linux.
> I consistently had the kernel crash (0 pointer dereference error) at startup
when enabling either RTIPv4, RTCFG or RTMAC.
>
> I finally found that there "might" be a problem with the Makefile
in kernel/drivers/net/stack.
> It turns out that (on my system at least), the order in which the protocol
stacks appear in the Makefile is wrong because (I running a kernel with
everything builtin, no modules) the protocols are loaded in that order, and
thus, (in my case) RTIPv4 gets initialized before stack_mgr does which cause
it to fail while registering (calling __rtdev_add_pack with a not
initialized rt_packets array).
>
> When I reorder the protocols in the Makefile, everything works flawlessly.
>
> I can provide a patch if this needs to be fixed.
>
Upstream does not support built-in RTnet. I suspect we need to sort this and
more issues out systematically in order to permit that. Also, the glue scripting
will need adjustments because of assumptions that RTnet comes in modules.
That said, contributions in that directions are welcome!
Jan
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Corporate Competence Center Embedded Linux
