tree 9ebcb8b60fc78f9843882ea07d554890f35ef0cc
parent e62a24ce27ab86efc1b37d14112c29d3f2010238
author Simon Glass <sjg@chromium.org> 1537317808 -0600
committer Simon Glass <sjg@chromium.org> 1538243375 -0600

sandbox: Add an explanation of the sandbox variants

There are quite a few builds of sandbox now. Add information about these
to the README.

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