* Get (mostly) rid of CFG_MONITOR_LEN definition; compute real length
  instead CFG_MONITOR_LEN is now only used to determine  _at_compile_
  _time_  (!) if the environment is embedded within the U-Boot image,
  or in a separate flash sector.

* Cleanup CFG_DER #defines in config files (wd maintained only)
diff --git a/board/iphase4539/flash.c b/board/iphase4539/flash.c
index 401ffbe..4eca467 100644
--- a/board/iphase4539/flash.c
+++ b/board/iphase4539/flash.c
@@ -71,7 +71,7 @@
 		/* monitor protection ON by default */
 		flash_protect(FLAG_PROTECT_SET,
 			      CFG_MONITOR_BASE,
-			      CFG_MONITOR_BASE + CFG_MONITOR_LEN - 1,
+			      CFG_MONITOR_BASE + monitor_flash_len - 1,
 			      flash_info + bank);
 #endif