于 2012年11月13日 17:42, Lauri Hintsala 写道:
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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