Prepare for SoC rework of ARM code:
- rename CONFIG_BOOTBINFUNC into  CONFIG_INIT_CRITICAL
- rename memsetup into lowlevel_init (function name and source files)
diff --git a/README b/README
index a9c052c..6cc7405 100644
--- a/README
+++ b/README
@@ -2128,6 +2128,15 @@
 		This only takes effect if the memory commands are activated
 		globally (CFG_CMD_MEM).
 
+- CONFIG_INIT_CRITICAL
+                [ARM only] If this variable is NOT defined, then
+                certain critical initializations (like setting up the
+                memory controller) are omitted. Normally this
+                variable MUST be defined for all boards. The only
+                exception is when U-Boot is loaded (to RAM) by some
+                other boot loader or by a debugger which performs
+                these intializations itself.
+
 Building the Software:
 ======================