diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..07ed706
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/*
\ No newline at end of file
diff --git a/tf-a-stm32mp-2.2.r1/build.sh b/tf-a-stm32mp-2.2.r1/build.sh
index c659633..0ec5a80 100755
--- a/tf-a-stm32mp-2.2.r1/build.sh
+++ b/tf-a-stm32mp-2.2.r1/build.sh
@@ -1,4 +1,17 @@
 #!/bin/bash
 #env var
-export PATH=$PATH:/home/chenyf/stm32mp157/toolchian/gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf/bin
+root_path=$(pwd)
+echo $root_path
+cd ../../toolchain/bin
+ls
+if [ -e "./arm-none-linux-gnueabihf-gcc" ]; then
+    echo find toochain arm-none-linux-gnueabihf-gcc
+    toolchain_path=$(pwd)
+    export PATH=$PATH:$toolchain_path
+    # arm-none-linux-gnueabihf-gcc -v
+    cd $root_path
+else
+    echo "toochain no find" 
+    exit 1
+fi
 make -f ../Makefile -j12 all