kernel 2.6.15: cpm_uart driver broken?

raul.moreno at raul.moreno at
Thu Oct 25 23:54:07 EST 2007


I've found this thread, but I haven't seen the end of the discussion. I am
using this kernel version, and I am also having problems with the cpm_uart.
Only the console (SMC1) is working, the other devices working as uart fail.
I've realised that the problem is in the DMA. The system crash when the Rx
and Tx buffers are allocated in external memory (in case of allocating in
the DPRAM of my mpc866, it works properly) and I don't know why. It is
supposed other devices (as fec) use the same functions
("dma_alloc_coherent") and they work.

Moreover I don't find any documentation about the parameters
parameters affect to the driver behaviour?

Could anyone help me?

Kind regards,

Raúl Moreno
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