openwrt原始编译目录： /etc/config -> mtk7621-buildroot/staging_dir/target-mipsel_uClibc-0.9.30.1/root-mtk762x/etc/config$
![openwrt 之设置uboot中tftp烧写证书变量[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)