GuruCE (http://guruce.com) will release a WEC7 BSP for the QSB as well. We're currently still working on it but expect a release in August.
Look here... http://www.adeneo-embedded.com/en/Products/Board-Support-Packages/Freescale-i.MX53-QSB
At the bottom of the page you can download the BSP for the QSB but make sure you get V1.21
Paul.
And it is fail to run sgtl500's drvier in iMX53 QSB based on IMX53 tablet BSP.