Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Convert imx6_esdhc_start_image() into a generic esdhc_start_image() by
making accept already filled "struct esdhc" as well as use
esdhc_read_blocks().

With that change, create new imx6_esdhc_start_image() whose sole task
is to properly fill a struct esdhc with appropriate offset and to pass
it on to esdhc_start_image().

Both changes are made with a goal of simplifying adding support of new
SoC in mind (see following commits adding support for i.MX8 as example).

NOTE: This commit does not re-implement imx6_esdhc_load_image(),
instead opting for dropping it, due to lack of any users in the
codebase.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Some i.MX53 want to setup the SDRAM from C code rather than
from DCD tables. The image size for these boards is limited
to the internal SRAM size. To overcome this limitation for
i.MX53 boards booting from NAND implement an xload mechanism
to load only the PBL to SRAM and let barebox load the rest
of the image itself after SDRAM has been initialized.

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

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

Add PBL xload code to load an image from SPI NOR flash. Currently implemented
for i.MX6.

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