Rom debugging

Can anyone give me any tips on how to get debug information out of the USB module – there must be an existing way, there are debug statments in the code from debuglib. I need to do it while interrupts are disabled. I’ve read snippets about a DADebug module which sounds what I’m looking for – can this be used in the rom or does it need to be loaded after the rom has initialised.

I haven’t a clue. Any help appreciated.

@Colin
Yes, *usbdevices shows the camera is on bus 1, the same as EHCI.
This time it displayed half the image folder before it carked it.
It is OK on RasPi.

Finally found this MUSBDriver wiki entry which should get me somewhere close. Thank you Jeffrey Lee.

Could someone make the castle.RiscOS.Sources.Programmer.DADebug folder available. It doesn’t come with the source code tar.bz2 files.

DADebug module

According to the products files that should be in the OMAP4 sources.

thanks