ubiformat: print messages after checking a block is not bad ...

ubiformat prints its "flashing eraseblock x" and "formatting eraseblock
x" messages before having checked that a block is actually good. This
is misleading, so first check if a block is good and only if it is
print a message.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ubiformat: Allow to ubiformat with a buffer given ...

So far ubiformat can only handle files. Make it possible to pass
a buffer into ubiformat.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/misc'

ubiformat: Add ubiformat write function ...

The ubiformat C API expects an image file as argument. With upcoming
Android fastboot sparse image support we can no longer provide a
complete image anymore. With this patch we can write an image in
multiple chunks after we've formatted a MTD device with ubiformat.

ubiformat_write will skip the EC header in both the MTD device we
write to and also the image we read from, so we can flash an image
on a MTD device containing EC headers already.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ubiformat: Lower message printing frequency ...

During scanning and formatting printing the messages on a serial line
has significant overhead up to the point where it takes longer to print
the messages than it takes to do the work. Lower the message printing
frequency to improve performance.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ubiformat: use default values for ubi_ver and image_seq ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands: ubiformat: move code to common/ ...

This is the final step to separate the ubiformat code from the
command. With this the ubiformat code gains a C API.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>