move file helper functions to separate file ...

We have our file helper functions in several places. Move them
all to lib/libfile.c.
With this we no longer have file helpers in fs/fs.c which contains
the core fs functions and no functions in lib/libbb.c which are
not from busybox.

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

fix format specifiers ...

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

bootm: beautify output ...

* fix indentation of options in 'help bootm'
* add missing help for -m
* put some output into debug/verbose mode

Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

misc: upper-case some abbreviations ...

Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: Drop devicetree merge support ...

I assume I am the only person knowing that barebox is able to
merge devicetrees. This feature seems broken for a while now since
trying to merge devicetress results in:

unflatten: too many end nodes

Remove this feature to save the complexity.

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

bootm: Return error when devicetree file is not a dtb ...

We check whether the file passed as devicetree actually is a devicetree,
but we missed to return an error if it's not. Fix this.

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

bootm: introduce bootm_load_devicetree helper ...

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

bootm: introduce bootm_load_initrd helper ...

Make the bootm handlers simpler by factoring out an initrd load
function.

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

bootm: introduce bootm_load_os helper ...

The common bootm code used to load uImage contents to SDRAM
before calling into the handlers if possible. This makes the
handlers complicated since they have to handle many cases. Instead,
introduce a helper to load the os after the handlers have figured
out a good load address.

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

bootm: Replace getenv_loadaddr with getenv_ul ...

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

bootm: Add dryrun support ...

This adds support for checking the bootm command without actually booting.

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

bootm: separate bootm input data and internal data ...

We used to use struct image_data as the central data structure for bootm and
also as the input data structure. This makes it unclear which of the fields
are actually input data. This patch creates a struct bootm_data which is
exclusively used for input data to make usage clearer.

Also it moves the dispatching of multifile uImage pathnames to the core bootm
code so that the core code gets more flexible and the command code simpler.

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

bootm: move globalvars from command to common ...

The globalvars should be available even if the bootm command
is not directly present.

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

bootm: move getenv_loadaddr from command to common ...

getenv_loadaddr may be used by other code, so move it
from command/ to common/

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

bootm: check for os image file ...

Check if an os image file has been given.

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

bootm: fix memory leak ...

data->of_root_node may be allocated from of of_unflatten_dtb.
Free it in this case.

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

bootm: fix possible memory leak ...

fdt is allocated, free it in error case.

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

bootm: factor out code to make it usable from C ...

Much of the bootm code is implemented in the command itself. Move
it to a common place to be able to call it from C aswell.

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