Merge branch 'support_for_dragino2'
-rwxr-xr-x 8753 Makefile
-rw-r--r-- 24901 README.md
-rw-r--r-- 29085 READMEPL.md
drwxr-xr-x - bin
drwxr-xr-x - host_util
drwxr-xr-x - original_u-boot_images
drwxr-xr-x - u-boot