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still have problems with that crap. something i found:
the address of the rx buffer is correctly in the register.
but the CAPR, even if i set it the address of the rx buffer, every rx irq i read it 0.
can someone tell me why it does this?

thanks, eddyb

It works now!
the problem was i was passing a virtual address to it, while it was expecting a physical one.
so, thanks to 0100101 and everyone else who helped me ,
eddyb.