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DSP bridge difference between 3730 and 3550

I'm running perfectly well DSP bridge on 3530 both on Angstrom and Android Froyo. But on 3730, the same binaries hangs the system even with the simple ping application. My dspbridge driver applied against linux-omap-psp 2.6.32 is here:

http://git.alwaysinnovating.com/cgit.cgi/ai.openembedded.dev/tree/recipes/linux/linux-omap-psp-2.6.32/omap3-touchbook/dspbridge.patch

Any idea what are the difference between 3530 and 3730 for DSP bridge?

Grégoire