DiskOnChip 2000/Millennium driver merge.

[David Woodhouse]

I've now cleaned up some of the differences between the new combined 
doc200[01] driver and the doc2001-only driver, and enabled 
DOC_SINGLE_DRIVER in the docprobe code.

I haven't removed the conditional stuff for two reasons -
	1. Ollie wants to keep the separate doc2001 driver for easier
		development and testing
	2. The doc2000 driver doesn't actually _work_ for writing. It
		exhibits the same behaviour with both types of device -
		writes to NFTL just don't appear to _stay_ written.

If you need write support for the Millennium right now, just comment out
the definition of DOC_SINGLE_DRIVER in docprobe.c and continue to use 
the doc2001 module.

As the doc2001 driver is working fine, I'm fairly sure it's a hardware
driver problem, not an NFTL code problem. Writes to the main body of the
flash appear to work too, so I currently suspect that it's an OOB data write
problem. 

If anyone else with Millennium hardware could take a look at the 
differences between doc2000.c and doc2001.c, especially Ollie who actually 
knows what he's doing, that'd be very much appreciated.

--
dwmw2




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