* 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/walnut405/flash.c b/board/walnut405/flash.c
index 81f950b..c9c7cbf 100644
--- a/board/walnut405/flash.c
+++ b/board/walnut405/flash.c
@@ -92,7 +92,7 @@
 	    /* Monitor protection ON by default */
 	    (void)flash_protect(FLAG_PROTECT_SET,
 				FLASH_BASE0_PRELIM,
-				FLASH_BASE0_PRELIM+CFG_MONITOR_LEN-1,
+				FLASH_BASE0_PRELIM+monitor_flash_len-1,
 				&flash_info[0]);
 	    size_b1 = 0 ;
 	    flash_info[0].size = size_b0;
@@ -133,7 +133,7 @@
 
 	    /* monitor protection ON by default */
 	    (void)flash_protect(FLAG_PROTECT_SET,
-				base_b0+size_b0-CFG_MONITOR_LEN,
+				base_b0+size_b0-monitor_flash_len,
 				base_b0+size_b0-1,
 				&flash_info[0]);
 
@@ -145,12 +145,12 @@
 
 	      /* monitor protection ON by default */
 	      (void)flash_protect(FLAG_PROTECT_SET,
-				  base_b1+size_b1-CFG_MONITOR_LEN,
+				  base_b1+size_b1-monitor_flash_len,
 				  base_b1+size_b1-1,
 				  &flash_info[1]);
 	      /* monitor protection OFF by default (one is enough) */
 	      (void)flash_protect(FLAG_PROTECT_CLEAR,
-				  base_b0+size_b0-CFG_MONITOR_LEN,
+				  base_b0+size_b0-monitor_flash_len,
 				  base_b0+size_b0-1,
 				  &flash_info[0]);
 	    } else {