diff --git a/openwrt/target/linux/package/base-files/files/brcm-2.4/etc/init.d/S05nvram b/openwrt/target/linux/package/base-files/files/brcm-2.4/etc/init.d/S05nvram
index ea40cd704e..728b2847b1 100755
--- a/openwrt/target/linux/package/base-files/files/brcm-2.4/etc/init.d/S05nvram
+++ b/openwrt/target/linux/package/base-files/files/brcm-2.4/etc/init.d/S05nvram
@@ -21,9 +21,9 @@ nvram_default() {
 }
 
 nvram_set() { # for the linksys fixup part
-	[ "$(nvram get "$1")" = "$2" ] || {
+	[ "$(nvram get "$1")" = "$2" -a "$2" != "" ] || {
 		COMMIT=1
-		nvram set "$1=$2"
+		/usr/sbin/nvram set "$1=$2"
 	}
 }
 
@@ -35,7 +35,7 @@ adm_switch="$(( ($boardflags & 0x80) >> 7 ))"
 case "$(( $boardtype ))" in
 	"$((0x708))")
 		if [ "$adm_switch" = 0 ]; then
-			nvram_set sdram_init "$(printf 0x%04x $(( $(nvram get sdram_init) | 0x0100 )))"
+			nvram_set sdram_init "$(printf 0x%04x $(( $(/usr/sbin/nvram get sdram_init) | 0x0100 )))"
 			[ "$COMMIT" = 1 ] && {
 				nvram_set sdram_config 0x0062
 				nvram_set clkfreq 216
@@ -49,7 +49,7 @@ case "$(( $boardtype ))" in
 		fi
 	;;
 	"$((0x467))")
-		nvram_set sdram_init "$(printf 0x%04x $(( $(nvram get sdram_init) | 0x0100 )))"
+		nvram_set sdram_init "$(printf 0x%04x $(( $(/usr/sbin/nvram get sdram_init) | 0x0100 )))"
 		[ "$COMMIT" = 1 ] && {
 			nvram_set sdram_config 0x0062
 			nvram_set sdram_ncdl 0x0