Add some information about this new bootmeth, including how to enable it
and how it works.
Series-to: concept
Cover-letter:
boot: Enhance VBE to support a separate devicetree FIT
It is sometimes desirable to have the devicetrees packaged with firware,
or in a different FIT from the OS. This series adds support for this,
including a test.
The new bootmeth can automatically locate a state file and use that to
decide what images to use when booting. The OS must update the file
before rebooting, if a different selection is required.
For now there is no logic to deal with boot failures.
END
Signed-off-by: Simon Glass <sjg@chromium.org>
7d92da0eef