omap/am33xx_bbu: use file_write_flash() instead of its own variant ...

There are two differences between file_write_flash() and write_image()
(which is removed in this patch):

 - file_write_flash() uses write_full() vs. write() in write_image()
 - file_write_flash() doesn't erase the whole device but only the needed
   space

So the new code should be more robust and maybe even faster.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

OMAP: am33xx_bbu_nand: Extent barebox update handler ...

Make it possible to write barebox image to multiple partitions
like xload partitions.

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fix erasing/protecting flashes with unspecified size ...

fixes: 81737c1 mtd: Fix erasing of devices >4GiB

Several places erased a complete flash partition passing ~0 as count to
erase(). With the above commit count to erase was changed from an unsigned
type to a signed type, so the (count > f->size - offset) check in
erase() no longer triggers and the ~0 count is no longer adjusted to the whole
device size. Among other things this results in saveenv failures on NOR
flashes.
This patch fixes this by introducing an explicit macro for erasing the
whole device which is tested for in erase(). All other negative values
are rejected.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reported-by: Giorgio <giorgio.nicole@arcor.de>

ARM: am335x: NAND MLO update: always let the user confirm updating ...

Before actually doing something the user should always confirm the
update. Move the question out of the if() block.

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

ARM: am335x: Add a NAND update handler for the regular barebox ...

To be able to not only update the MLO in NAND but also the
regular barebox image.
Since this is implemented with help of the corresponding xload
handler this also removes the 'xload' from the Kconfig options
and the filename.

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