Is something using DMA channel 0?
slapdau at yahoo.com.au
Thu Nov 7 03:44:49 EST 2013
On 11/07/2013 09:03 PM, Richard Hirst wrote:
> Servoblaster uses DMA channel 0 from user space too, by directly
> accessing registers through /dev/mem. That is quite widely used and I
> haven't heard of any issues with it. That code to turn the Pi in to an
> FM radio transmitter did it too. I'm not trying to suggest it is a good
> approach, but it seems to work in many cases.
That being the case, then I really have no idea. I don't own any
servos, otherwise I might have been tempted to see if I could find a way
to cause Servoblaster to break by generating screen buffer activity.
Compare headless vs. console vs. GUI.
Oh well. Best of luck Philip.
More information about the linux-rpi-kernel