IMX53 UART3 DMA_ERROR

wenpengqiu — Tue, 23 Apr 2013 02:14:15 GMT

R10.3, IMX53

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

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?

wenpeng

Re: IMX53 UART3 DMA_ERROR

HuangShijie — Sat, 27 Apr 2013 05:34:34 GMT

could you try the latest code about imx53?

we fixed some bugs about the uart.

The latest patch about the uart is:

"19164f8 ENGR00252150 Fix MX53 IOMUX setup for all UARTs"

thanks

Huang Shijie

feifeihu — Fri, 14 Jun 2013 04:15:25 GMT

it still happens on my UART3 with those patches merged