Add a simple unit test for testing the RAUC bootmethod. Provide only the
very basic tests for now, running a scan and list, to verify correct
detection of the RAUC bootmethod. More advanced boot tests of this
bootmethod can be added in a separate patch.

This requires another mmc image (mmc10) to contain the following
partitions:

1. boot A: contains a dummy boot.scr
2. root A: contains an empty root filesystem
3. boot B: contains a dummy boot.scr
4. root B: contains an empty root filesystem

The bootmeth_rauc scans all four partitions for existence and expects a
boot script in each boot partition.

Also add BOOTMETH_RAUC as a dependency on sandbox so that we can test
this with:

$ ./test/py/test.py -B sandbox --build -k test_ut # build the mmc10.img
$ ./test/py/test.py -B sandbox --build -k bootflow_rauc

Signed-off-by: Martin Schwan <m.schwan@phytec.de>
Reviewed-by: Simon Glass <simon.glass@canonical.com>
[trini: mmc9 is now in use, switch to mmc10]
Signed-off-by: Tom Rini <trini@konsulko.com>

Kory Maincent (TI.com) <kory.maincent@bootlin.com> says:

This series converts the extension board framework to use UCLASS as
requested by Simon Glass, then adds extension support to pxe_utils
and bootmeth_efi (not tested) to enable extension boards devicetree load
in the standard boot process.

I can't test the imx8 extension scan enabled by the
imx8mm-cl-iot-gate_defconfig as I don't have this board.
I also can't test the efi bootmeth change as I don't have such board.

Link: https://lore.kernel.org/r/20251030-feature_sysboot_extension_board-v5-0-cfb77672fc68@bootlin.com

Remove the legacy extension board implementation now that all boards
have been converted to use the new UCLASS-based framework. This
eliminates lines of legacy code while preserving functionality
through the modern driver model approach.

Update the bootstd tests, due to the removal of extension hunter.

Signed-off-by: Kory Maincent (TI.com) <kory.maincent@bootlin.com>

At present the EFI bootmgr scans all devices in the system before
deciding which one to boot. Ideally it would use the bootstd iterator
for this, but in the meantime, give it a lower priority, so it runs
just before the network devices.

Note that if there are no hunted network devices hunted, then it will
run at the end, after all bootdevs are exhausted. In other words, it
will always run.

Signed-off-by: Simon Glass <sjg@chromium.org>

At present before scanning global bootmeths, the iterator sets the
method count to the index of the first global bootmeth. Now that we
support scanning the global bootmeths multiple times, we must leave this
count alone.

Check against have_global and first_glob_method instead.

Signed-off-by: Simon Glass <sjg@chromium.org>

Add a bitfield which tracks when bootmeths have been used. This will be
needed when global bootmeths can be used later in the iteration.

Fix a missing bootflow_free() while here.

Signed-off-by: Simon Glass <sjg@chromium.org>

The current 'doing_global' refers to being in the state of processing
global bootmeths. Since global bootmeths are currently used once at the
start, it becomes false once the last global bootmeth has been used.

In preparation for allowing bootmeths to run at other points in the
bootstd interation, add a new 'have_global' flag which tracks whether
there are any global bootmeths in the method_order[] list. It is set up
when iteration starts. Unlike doing_global which resets back to false
after the global bootmeths have been handled, once have_global is set to
true, it remains true for the entire iteration process. This provides a
quick check as to whether global-bootmeth processing is needed.

Signed-off-by: Simon Glass <sjg@chromium.org>

For now we only support dropping non-global bootmeths from the
iteration. Update first_glob_method in that case and add a few checks
that things are correct.

Signed-off-by: Simon Glass <sjg@chromium.org>

These have different behaviour from normal bootmeths and we are about to
enhance it. So add a test and also an extra check in bootflow_iter()

Signed-off-by: Simon Glass <sjg@chromium.org>

Add a few comments about global bootmeths and first_glob_method

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@kernel.org>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>