chpart, nboot and NAND subsystem related commands now accept also partition
name to specify offset.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Stefan Roese <sr@denx.de>

Make sure the string passed as variable name does not contain a '='
character. This not only prevents the common error or typing
"setenv foo=bar" instead of "setenv foo bar", but (more importantly)
also closes a backdoor which allowed to delete write-protected
environment variables, for example by using "setenv ethaddr=".

If a Multi-Image file contains a third image we try to use it as a
device tree.  The device tree image is assumed to be uncompressed in the
image file.  We automatically allocate space for the device tree in memory
and provide an 8k pad to allow more than a reasonable amount of growth.

Additionally, a device tree that was contained in flash will now automatically
get copied to system memory as part of boot.  Previously an error was
reported if one tried to boot a device tree that was in flash.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

Merge with /home/sr/git/u-boot/4xx-idcr

(Conflicts between Jon Loeliger's and Matthew McClintock's tree
 were resolved by in favour of Jon's version.)