本文介绍了如何在Android shell中使用dmatest进行DMA测试，并在测试过程中遇到的问题及解决方法。
mount -t debugfs none /sys/kernel/debug/
insmod dmatest,ko （Android shell, generic comand no effecte）
chmod 777 /sys/kernel/debug/dmatest/*
echo dma0chan0 > /sys/kernel/debug/dmatest/channel
echo 2000 > /sys/kernel/debug/dmatest/timeout
echo 10> /sys/kernel/debug/dmatest/iterations
echo 1 > /sys/kernel/debug/dmatest/run
When test , other modules seems need to not use DMA(such as UART)
suppose when test, no other modules are useing dma controller (Don't know it is caused by test case or driver)
More info please refer to Documations/dmatest.txt
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