tree 8d79d46d008ab73f47d0c005c4637502c2d1c7c3
parent b3cb1c4c0b6b48543542dcb736e30b22b0796815
author Simon Glass <sjg@chromium.org> 1723070856 -0600
committer Tom Rini <trini@konsulko.com> 1723241000 -0600

upl: Add initial documentation

Add some documentation to explain the basic concept along with a link
to the full spec.

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