sandbox: Update and expand the README
Now that sandbox has a good base of features, the README is quite out of
date. Update it, and document the new features.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/README b/README
index b973344..4178987 100644
--- a/README
+++ b/README
@@ -264,6 +264,17 @@
directory according to the instructions in cogent/README.
+Sandbox Environment:
+--------------------
+
+U-Boot can be built natively to run on a Linux host using the 'sandbox'
+board. This allows feature development which is not board- or architecture-
+specific to be undertaken on a native platform. The sandbox is also used to
+run some of U-Boot's tests.
+
+See board/sandbox/sandbox/README.sandbox for more details.
+
+
Configuration Options:
----------------------