Thread (15 messages) 15 messages, 3 authors, 2012-11-15
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[PATCH v2 2/3] serial: mxs-auart: add the DMA support for mx28

From: Huang Shijie <hidden>
Date: 2012-11-15 03:20:35
Also in: linux-serial 

? 2012?11?13? 17:42, Lauri Hintsala ??:
Hi Huang,

DMA support doesn't work with latest stable v3.6.5 or development 
3.7-rc5 kernels. I get following error message when I open the serial 
port /dev/ttyAPP0:

[ 48.730000] mxs-auart 8006a000.serial: step 1 error
[ 48.750000] mxs-auart 8006a000.serial: We can not start up the DMA.
I tested this patch set in imx28-evk board Rev C with linux-next-20121114.
it works fine.

Maybe you can try the linux-next code.

About the flow control:
If we do not enable the HW flow control, the data may lost. And I do not 
know how to handle with the Xon/Xoff when the DMA is supported.

Best Regards
Huang Shijie
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