my board is based on iMX51 + 13892 and WinEC700.
The board has a docking base that allow to connect the board to the wall charger.
Sometimes happen that if i insert the board on the base, the sound (based on SGTL5000) stops to work.
Other effect is that I'm not able to switch off the board via software.
I debugged the problem adding serial debug outputs on the sound driver: when i run a sound i always see the couple of event BSPAudioStartDAC() + BSPAudioStopDAC().
When the problem is on, i only see the call to BSPAudioStartDAC() and then no more other output for the audio driver.