At91EfcRegionUnlock et al lockup

Hello.

I've come across a peculiar issue with
At91EfcRegionUnlock/At91EfcRegionLock/At91EfcSectorWrite on the
AT91SAM7X256.

When my board is "fresh" out of flash from SAM-BA, I'm able to use the
At91Efc functions to write a new firmware image to flash. However, once that
process is complete, that same process will freeze upon either a call to
At91EfcRegionUnlock or At91EfcSectorWrite. It seems as if the EFC is locked
out completely. 

Here is the code I'm using. IMAGE_OFFSET is 0x00, and offset and pos are
calculated accordingly. 

if (At91EfcRegionUnlock(IMAGE_OFFSET + offset + pos) == 0)	{
	rc = At91EfcSectorWrite(IMAGE_OFFSET + offset + pos, &buffer[pos],
size);
	At91EfcRegionLock(IMAGE_OFFSET + offset + pos);
}		

Does anyone have any ideas about what state SAM-BA leaves the EFC in after
it's used to flash the board? And, if so, how can I emulate that in code?

Thanks in advance.

Best Regards,
Coleman  

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