NAND chip that understands the basic NAND command set (most chips have
some own custom commands but operating systems don't use them). It can
emulate mostly all of the chips supported by Linux given the
manufacturer id and chip id, including large page devices. The table
of IDs is taken from Linux. I added a "-mtdblock filename" switch for
pointing qemu to the image to use. If no image is given nand.c will
store data only in memory and discard it on quit.

The patch also has a routine that calculates the ECC checksums that
most NAND controllers use (but not the chip itself).

Cheers,
Andrew