AnsweredAssumed Answered

IMX53 UART3 DMA_ERROR

Question asked by wenpengqiu on Apr 22, 2013
Latest reply on Jun 13, 2013 by Feifei Hu

R10.3, IMX53

I

try to enable UART3 DMA mode, and get below errors:

 

UART: DMA_ERROR: sr1:2040 sr2:508c

UART: DMA_ERROR: sr1:2040 sr2:5088

 

My uart3 connnect to a bluetooth module, and only first serval DMA-read operations occur this error, sequential DMA-read will successful.

I patch several commits from 10.4 including the one which update UART SDMA scripts, but this error still occurs.

 

BTW, I noticed this git commit:

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

commit a77a4c4f12640c414adf8c4381cb1d8eb8364dd0

Author: Zhang Jiejing <jiejing.zhang@freescale.com>

Date:   Wed Dec 8 20:24:04 2010 +0800

 

    ENGR00137669-3 MX53_SMD: workaround for UART have problem when DMA enable.

   

    There is a clock issue when UART3 enable DMA, so disable this.

   

    Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com>

 

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

 

what's mean "a clock issue"? any detail?

BR

wenpeng


Outcomes