Add toolchain download address

recompile

@@ -67,11 +67,14 @@ repo_branch="main"
 # Cross compile toolchain download mirror, run on ubuntu-20.04
 dev_repo="https://github.com/ophub/script/releases/download/dev"
 # armbian
+# armbian download from: https://github.com/ophub/amlogic-s9xxx-armbian/releases
 armbian_rootfs_file="armbian_22.02.0_Aml_s922x_bullseye_5.10.93.tar.xz"
 # gcc
+# gcc download from: https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-a/downloads
 #gcc_repo="https://developer.arm.com/-/media/Files/downloads/gnu-a/10.3-2021.07/binrel"
 gcc_file="gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu.tar.xz"
 # clang
+# clang download from: https://github.com/llvm/llvm-project/releases
 #clang_repo="https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.0"
 clang_file="clang+llvm-13.0.0-x86_64-linux-gnu-ubuntu-20.04.tar.xz"