board: sl28: add update image documentation
authorMichael Walle <michael@walle.cc>
Wed, 29 Sep 2021 11:39:13 +0000 (13:39 +0200)
committerPriyanka Jain <priyanka.jain@nxp.com>
Tue, 9 Nov 2021 09:20:21 +0000 (14:50 +0530)
commitcbdc4c974fbd884c40b7923d9f5f9d0d165d4268
treef16f0a5eb05fe52ab37f99eef0ce947636ef1c50
parentf06add11f073b0a6cffff6c4c3aa4c91378c035b
board: sl28: add update image documentation

Document the update image and how to use the EFI UpdateCapsule.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
doc/board/kontron/sl28.rst