Based on 
http://www.ti.com/pdfs/wtbu/OMAP4430_4460_4470_PUBLIC_TRM_Addendum_ABE_HAL_vF.pdf
 each ABE port have "asynchronous sample-rate converters."
====================================
The ports are exchanging 8 to 32bits data MSB aligned on a 32bits container. 
MM_DL allows
receiving two concatenated 16bits Left/Right samples per 32bits accesses.
The sampling rate is 48kHz. Voice paths use 8 or 16kHz. MM_DL use 44.1kHz or 
48kHz.

The sampling rate of MM_DL and voice ports can be adjusted with 1ppm accuracy 
using the
asynchronous sample-rate converters.
====================================

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Developers, which is subscribed to linaro-landing-team-ti.
https://bugs.launchpad.net/bugs/893402

Title:
  [regression] sound not working on panda with lt-omap at 11.11

Status in Linaro Texas Instruments Landing Team:
  Fix Released
Status in Linaro Ubuntu Evaluation Builds:
  In Progress

Bug description:
  on both 4430 and 4460 panda I get no sound out
  I have tried both the gui speaker test and command line and all I here is a 
click at the beginning and ending of a sound file
  this is with the 21-2 lt-x11 hwpack

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