scripts: zynq_mkimage: remove compiler warning ...

Fixes a warning while compiling zynq_mkimage.c
scripts/zynq_mkimage.c:312:2: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]
fread returns the number bytes read, if it is not equal to st_size some error has happend

Signed-off-by: Michael Graichen <michael.graichen@hotmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: zynq: add size check in zynq_mkimage ...

Currently Barebox does not support 2 stage loading on Zynq, so the
image must fit into the free OCRAM area. Add a check to the mkimage
tool to validate this.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: zynq: move header generation to zynq_mkimage ...

Instead of generating a suitable image header with linker magic, move
all of this into zynq_mkimage. The configuration file format and parsing
is based on imx-image. This gets us one step further on the road to
proper multi-image support.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: zynq: use getopt in zynq_mkimage ...

Makes extending the command line much easier.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: zynq: add zynq fsbl checksum script ...

The bootrom only reads an image if the correct checksum is present in the
header. The calculation is pretty simple:
sum over all words from 0x20 to 0x44
Two of this words are the image length. That is why the checksum can not be
calculated until barebox_image_size is known.
The easiest solution is a program that has to be run after make.

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