Been running tests with the hifiberry cards and seems that the card fills up the coherent pool.
After 4Days .. it stopped playing and i got this in the log:
May 12 14:20:24 raspberrypi kernel: [358744.839830] ERROR: 4096 KiB atomic DMA coherent pool is too small!
May 12 14:20:24 raspberrypi kernel: [358744.839830] Please increase it with coherent_pool= kernel parameter!
Im running a loop,
Having mplayer play a mp3 file to end and then quit. , starting over the same procedure with a new file.
Uptime 4 days, 7:57, 1 user, load average: 0.05, 0.06, 0.10
Linux raspberrypi 3.10.38+ #675 PREEMPT Sun Apr 27 18:15:12 BST 2014 armv6l GNU/Linux
pi@raspberrypi ~ $
DMA coherent pool is to small Crash