I want to initiate a DMA-Transfer for testing.

I stumbled accross a dmatest.c in the kernel sources (drivers/dma). I compiled a Kernel with this Module and tried it without any params.

Code:
sudo modprobe dmatest
and i get with dmesg

Code:
__dma_request_channel: fail ((null))
What are the prerequisites for dmatest.ko?
Should I load a special DMA-Engine?z
Is a special param for dmatest.ko required (default should probe anything!?)?

Best Regards
Fuz