[U-Boot] [PATCH] Document config_distro_bootcmd environment variables for interactive booting.

[Karsten Merker]

Signed-off-by: Karsten Merker <merker at debian.org>
---
 doc/README.distro |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/doc/README.distro b/doc/README.distro
index dd0f1c7..5150eda 100644
--- a/doc/README.distro
+++ b/doc/README.distro
@@ -1,6 +1,7 @@
 /*
  * (C) Copyright 2014 Red Hat Inc.
  * Copyright (c) 2014-2015, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2015 K. Merker <merker at debian.org>
  *
  * SPDX-License-Identifier:     GPL-2.0+
  */
@@ -339,3 +340,19 @@ scan_dev_for_scripts:
 
   If you want to disable boot.scr on all disks, set the value to something
   innocuous, e.g. setenv scan_dev_for_scripts true.
+
+
+Interactively booting from a specific device at the u-boot prompt
+=================================================================
+
+For interactively booting from a user-selected device at the u-boot command
+prompt, the environment provides predefined bootcmd_<target> variables for
+every target defined in boot_targets, which can be run be the user.
+
+Examples:
+
+ - run bootcmd_usb0
+   boots from the first USB mass storage device
+
+ - run bootcmd_mmc1
+   boots from the second MMC device
-- 
1.7.10.4