Hello Wolfgang,

> I'm following the discussion and realized that it will not work for
> devices doing the local loopback in hardware, like the flexcan
> controller. 

What is actually the advantage of using hardware loopback? One can
always quit using it and use Tx interrupt for self reception ...

> Strictly speaking it will only work properly for drivers
> doing the local loopback in software when the TX done interrupt is
> handled. Also some USB devices are not able to do that properly.

Yes, active cards is a problem. The firmware shall support self
reception
and loop back the sent messages in order to guarantee correct behavior. 
The timestamp is also pain ...

Regards,
Vladislav
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