Revert "globalvar: make globalvar functions more consistent" ...

This reverts commit 1b4a05c.

globalvar: make globalvar functions more consistent ...

Similar to the device parameter functions also make the globalvar
functions more consistent. This also adds support for readonly
globalvars and changes several existing globalvars which should
really be readonly to readonly.

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

bootchooser: register as bootentry provider ...

Instead of using a global function called by
bootentry_create_from_name(), register the bootchooser as bootentry
provider.

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

blspec: register as bootentry provider ...

Instead of using a global function called by
bootentry_create_from_name(), register blspec as bootentry
provider.

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

boot: Allow to register boot entry providers ...

bootentry_create_from_name() takes a name and creates bootentries
for it. It tries different providers that interpret the name:
blspec, bootchooser or script pathes. Instead of hardcoding the
different providers in the function, allow the providers to register
themselves.

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

menu: sanitize menu_add_title ...

passing a string to menu_add_title() which then gets free by this
function is just plain ugly. Pass it a const char * which gets
duplicated in menu_add_title() when necessary.

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

boot: add framework for redundant boot scenarios ...

There are several use cases where a redundant Linux system is needed. The
barebox bootchooser framework provides the building blocks to model different
use cases without the need to start from the scratch over and over again.

The bootchooser works on abstract boot targets, each with a set of properties
and implements an algorithm which selects the highest priority target to boot.

See the documentation contained in this patch for more information.

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

Merge branch 'for-next/menu'

rework menu so that it can support multiline titles ...

Signed-off-by: Aleksey Kuleshov <rndfax@yandex.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

blspec: Handle nfs:// pathes from boot ...

Fixes: cb47dde boot: Call blspec_scan_directory() only on strings containing an absolute path

This commit introduced a check if the path contains a '/' at the
beginning. For booting a bootloader spec entry from NFS we have to
test the path for starting with "nfs://" aswell.

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

properly remove menu entry ...

Signed-off-by: Aleksey Kuleshov <rndfax@yandex.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fix double free ...

it already gets free in bootentries_free
no need to do this in ->release method

Signed-off-by: Aleksey Kuleshov <rndfax@yandex.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

boot: add single quotes when printing boot target names ...

It's nicer to read when target names have quotes around them, it
makes it clear that this is a string passed in somewhere.

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

boot: Move code to common/ ...

Normally code in commands/ shall only do the option parsing whereas the
functionality shall be in common/ to make the code usable from C aswell.
Do this in the boot code aswell, move it to common/boot.c and add the
function prototypes to include/boot.h

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