bootm: add initial FIT support ...

This implementation is inspired by U-Boot's FIT support. Instead of
using libfdt (which does not exist in barebox), configuration signatures
are verified by using a simplified DT parser based on barebox's own
code.

Currently, only signed configurations with hashed images are supported,
as the other variants are less useful for verified boot. Compatible FIT
images can be created using U-Boot's mkimage tool.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

bootm: make verifying/hashing configurable ...

So long struct bootm_data.verify is a bool which enables CRC checking
(hashing). Extend this to a enum and add support for signature checking
in the same option. This also adds the corresponding globalvar and a
-s option to bootm.

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

bootm: Initialize bootm_data defaults in single place ...

Both the bootm and the boot code initialize the struct bootm_data
with defaults from the bootm global variables. Create a common
function for doing this.

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

bootm: move oftree code together ...

The device tree code is distributed in several places in the bootm code.
Move it all together in bootm_load_devicetree().

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

bootm: move initrd code together ...

The initrd code is distributed in several places in the bootm code.
Move it all together in bootm_load_initrd().

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

bootm: Push dryrun to handlers ...

We can make the dryrun option more useful by calling into the handlers.
With this we can detect more cases that can go wrong during boot.

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

bootm: use names instead of numbers for image parts ...

The uImage format uses numbers for to identify the different
parts of a image, but the FIT image format uses names. To better
integrate the FIT image format into bootm always use names and
convert them to numbers when necessary.

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

bootm: introduce bootm_get_os_size ...

ARM do_bootm_linux is not only called with uImages but also with
raw images, so we can't use uimage_get_size() here. Introduce
bootm_get_os_size() which handles the different image types.

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

bootm: Do not call uimage_close twice ...

uimage_close() is called on bootm cleanup, so do not close it
in the failure path in bootm_open_os_uimage().

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

bootm: get file type before bootm_open_os_uimage ...

Using a  multi uimage stored in nand didn't work. Only one open for the
bb file is allowed. The file type detection after bootm_open_os_uimage
will fail. bootm_open_initrd_uimage and bootm_open_oftree_uimage already
check if they can reuse data->os.

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

bootm: cleanup bootm_open_oftree ...

Separate oftree file and uimage oftree handling.
Make fie_type checks in bootm_boot

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

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>