README: Document CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG

This option is intended to be set by boards which will set the
board_name and board_rev environment variables.  These are to be used
when the U-Boot binary can support more than one board type at run-time
and the user needs an easy way (for example for scripting to determine
what device tree to load) to determine what board they are on.

Signed-off-by: Tom Rini <trini@ti.com>

diff --git a/README b/README
index 22fd6b761ef82090df1fc55f5eefb653c5620489..06c1b15e98ab8f7f4d343bf23f50091715af07a1 100644 (file)
--- a/README
+++ b/README
@@ -2311,6 +2311,12 @@ CBFS (Coreboot Filesystem) support
                - CONFIG_SYS_VENDOR
                - CONFIG_SYS_SOC
 
+               CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
+
+               Define this in order to add variables describing certain
+               run-time determined information about the hardware to the
+               environment.  These will be named board_name, board_rev.
+
 - DataFlash Support:
                CONFIG_HAS_DATAFLASH