Rx problems with IDMA on MPC860...

Rx problems with IDMA on MPC860...

[Pedro Parrilla]

    Hi,

    I'm working on a MPC860T. I've been trying to receive from a
peripheral via IDMA and it seems to work OK, but when I study data
received from IDMA I can see that there are some bytes at the end of
each IDMA buffer received that are wrong, in fact they haven't been
written to the buffer and previous bytes remain; but interrupts are
received Ok, and the number of read bytes in the peripheral are the IDMA
set.

    It could be an access problem to the peripheral with IDMA(without
IDMA this access is totally OK!).

    Does anybody have any experience in this regard?


    Thank you in advance.

    ---------------------------------------------

 Pedro Parrilla Jimena                           Prodys.S.L
 Embedded Systems Programming     Trigo,54
 e-mail pparrilla@prodys.net              Leganes(Madrid) 28914
 Tel.:+34916896880                               http://www.prodys.net


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Re: Rx problems with IDMA on MPC860...

[Wolfgang Denk]

In message <3EBA0BAE.93167851@prodys.net> you wrote:
>
>     I'm working on a MPC860T. I've been trying to receive from a
> peripheral via IDMA and it seems to work OK, but when I study data
> received from IDMA I can see that there are some bytes at the end of
> each IDMA buffer received that are wrong, in fact they haven't been
> written to the buffer and previous bytes remain; but interrupts are
> received Ok, and the number of read bytes in the peripheral are the IDMA
> set.

Are you sure you got the cache handling right?

Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
If in any problem you find yourself doing an immense amount of  work,
the answer can be obtained by simple inspection.

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