doc: Mention automatic binding of bootmeths

Add a note about how bootmeth drivers are instantiated.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Suggested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

diff --git a/doc/develop/bootstd/overview.rst b/doc/develop/bootstd/overview.rst
index aa38ad9a0ea2ae6bc42fd3b6851d05f1e1724f5c..e04c683fb1114aab621c65f2a91f1f160b26c2a1 100644 (file)
--- a/doc/develop/bootstd/overview.rst
+++ b/doc/develop/bootstd/overview.rst
@@ -424,6 +424,9 @@ Bootmeth drivers are provided for:
    - EFI boot using boot manager
    - Android bootflow (boot image v4)
 
+Each driver is controlled by a Kconfig option. If no bootmeth driver is
+selected by a compatible string in the devicetree, all available bootmeth
+drivers are bound automatically.
 
 Command interface
 -----------------