diff --git a/README.md b/README.md
index 5b2b67a..9754961 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,12 @@ https://github.com/hyphop/khadas-linux-kernel
     ./make_kernel_mainline_vimsX
     ./make_kernel_mainline_vimsX_modules
 
+## Deps
+
++ flex bc 
+
+    apt-get install flex bc 
+
 ## Configs
 
 [configs](configs)
diff --git a/scripts/auto_krescue_amlrock b/scripts/auto_krescue_amlrock
index d6b3fe1..1642776 100755
--- a/scripts/auto_krescue_amlrock
+++ b/scripts/auto_krescue_amlrock
@@ -12,9 +12,14 @@ export LINUX_VER=linux-5.7
 
 ./$kernel_prepare
 
+CHK=1 ./patch_ || {
+
 ./patch_ ../patches/$LINUX_VER/*.patch || exit 1
 ./patch_ ../patches/linux-krescue/*.patch || exit 1
 
+LAST=1 ./patch_
+}
+
 ./make_kernel_mainline_vimsX -n
 ./kernel_config ../files/configs/mmc_m
 ./kernel_config ../files/configs/eth2_y
diff --git a/scripts/patch_ b/scripts/patch_
index cad4cd3..211659a 100755
--- a/scripts/patch_
+++ b/scripts/patch_
@@ -27,7 +27,15 @@ done
 
 echo "[i] patch dir $DIR">&2
 
+[ "$CHK" ] && [ -s $DIR/.patched ] && {
+    echo "[i] patched already $(cat "$DIR/.patched")">&2
+    exit 0
+}
+
 for p in $@; do
     echo "[i] patch $p">&2
     patch -d $DIR -p1 < $p
 done
+
+
+[ "$LAST" ] && echo $(date) > $DIR/.patched