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well, the crash was caused by the erroneous use of 32 bit accesses on the trc0 register. i've tried removing this from a version I have based on the reference code from pjrc, and it still seems to move packets, so my problem is almost certainly in bdt management. it would be interesting to...

referencing usb_dev.c:usb_init, there is a set to a reserved bit in the USB0_USBTRC0 register at 0x40. there clearly may be other problems with my code, but if I set this bit I take a fault. is there any background as to where this bit came from? thanks for your time