tree aab3795cf865edbb9808905c41f2df5ea457e16d
parent 5d2199d8870ad7e1c9ffcc8ac869659f8425b22e
author Simon Glass <sjg@chromium.org> 1637726988 -0700
committer Simon Glass <sjg@chromium.org> 1638721304 -0700

binman: Allow providing tools and blob directories

At present it is necessary to symlink files containing external blobs into
the U-Boot tree in order for binman to find them. This is not very
convenient.

Add two new environment/Makefile variables to help with this. Add
documentation as well, fixing a related nit.

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