In file arch/arm/common/edma.c function edma_of_read_u32_to_s16_array() doesn't parse the "ti,edma-xbar-event-map" configuration from DT file correctly.
As a result xbar_chans is -1 in edma_xbar_event_map() and nothing is being written to the EDMA xbar registers.
Same funcion (edma_of_read_u32_to_s16_array()) works properly in kernel 3.8.
http://permalink.gmane.org/gmane.linux.kernel.commits.head/446393 fixes this issue for me. Tested with Gumstix Pepper with patch cherry-picked to a 3.14.4-based kernel.