Add file location to dtso file and add uart0 to overlay for MTCAP

1 files changed, 22 insertions, 3 deletions

diff --git a/README b/README
index 1a4debd..6167976 100644
--- a/README
+++ b/README
@@ -11,9 +11,6 @@ See this for the format of an overlay:
 
 https://www.kernel.org/doc/Documentation/devicetree/overlay-notes.txt
 
-Note that as of 10 May 2019, no overlays have been
-released.
-
 The biggest flaw in overlays, is the inablitiy to use
 the phandle described in an alias in the boot
 time device tree in an overlay, so it appears
@@ -23,3 +20,25 @@ is common to reference a "pio" in device tree to
 use a PIO with GPIO.  For example, it does not appear
 to be possible to use &pioC in the overlay without
 redefining it.
+
+The recipe that uses the overlay reads a comment
+in the overlay source to determine the destination
+and any symlink locations.
+
+The comment in the file must be as follows for
+locations and symlinks:
+
+/*
+ * Put:     /a/b/c/d.dtbo
+ * Link:    /a/x/y/d.dtbo
+ *
+ */
+
+The install is looking for a line that
+starts with " * Put:  " or " * Link: ".
+Extra spaces before the path are allowed.
+The link will always point at the path
+specified by Put.
+
+The path given is relative to the device
+tree overlay location.