Hi,
Below you can find some threads and an application note regarding USB configuration on i.MX6:
Power State Wakeup accepted interrupts and wakeup times for IMX6 SoloLite?
iMX6 SABRE SD can't see USB mouse and keyboard
http://www.nxp.com/files/32bit/doc/app_note/AN4589.pdf
Hope this will be useful for you.
Best regards!
/Carlos
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