diff --git a/Create-DevTerm-R01-OS-image-from-scratch.md b/Create-DevTerm-R01-OS-image-from-scratch.md
index 069443b..6d75a52 100644
--- a/Create-DevTerm-R01-OS-image-from-scratch.md
+++ b/Create-DevTerm-R01-OS-image-from-scratch.md
@@ -182,8 +182,8 @@ https://mega.nz/file/kNUBRBIB#NsPzKTDWbfBSTth7-eVz9gPjeaEdYnP7PfuYGz28cOk
 https://github.com/cuu/last_linux-5.4.git
 
 it is a mirror kernel code from tina_d1_h  of all winner with all patched for devterm d1
-## get toolchain
-https://github.com/cuu/toolchain-thead-glibc
+## Official toolchain
+https://github.com/cuu/toolchain-thead-glibc #It's official allwinner toolchain
 download toolchain
 
 ## simple step for compiling kernel
@@ -213,6 +213,12 @@ kernel patch url: https://github.com/clockworkpi/DevTerm/tree/main/Code/patch/d1
 
 to get original tina code from allwinner ,visit https://open.allwinnertech.com/
 
+## Mainline toolchain
+https://github.com/riscv/riscv-gnu-toolchain
+all the same as Official toolchain except need to disable Vector in kernel `make menuconfig`
+
+![d1_disable_vector_kernel](https://raw.githubusercontent.com/clockworkpi/DevTerm/main/Pictures/d1_disable_vector_kernel.jpg)  
+
 # Make alpha os image 
 
 required file list: