Hello,

Is it possible copy memory to memory (kernel space) using DMA on AT91SAM9G20?
Is there any example?

Thanks!!

Hi johnpaul,

Have a look at: http://lwn.net/Kernel/LDD3/ , chapter 15
for a description on how to use DMA generally in the linux kernel.

As for examples, I'm using the same chip, and during my perusal of the kernel source
I've noticed quite heavy DMA usage in the at91 macb (ethernet) driver:
http://lxr.free-electrons.com/source/drivers/net/macb.c

Regards
Erik Sandbraaten