SPI, DMA and an i.MX31

Andy Green andy at warmcat.com
Tue Sep 22 10:10:00 EDT 2009

On 09/22/09 14:22, Somebody in the thread at some point said:

Hi Rene -

> After changing that my system booted smoothly. If I look in '/proc' there
> is a dir called 'sdma', and inside there is a file 'channels':
> $ cat channels
> Channel 0: MCU
> It seams to be alive :-)
>> Take a look at ./drivers/mmc/host/mxcmmc.c
> Next will try to test the mmc driver, but I don't have an MMC/SD slot on
> my board. Hopefully there is some sign of an MMC in the channels
> file or so.

Sounds encouraging... if you want to post or send a test patch if it 
gets to that point I'll try to give it a go on a real SD Card.

At the moment event/0 which owns the PIO to the SD card eats most of the 
CPU on a loaded system, this should be pretty revolutionary when it works.


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