(xenial-amd64)ppisati@gloin:~/snapcraft/examples/96boards-kernel$ snapcraft --target-arch arm64 snap
Setting target machine to 'aarch64'
Cross compiling kernel target 'arm64'
Preparing to pull kernel 
Pulling kernel 
From https://github.com/96boards/linux
 * branch            HEAD       -> FETCH_HEAD
Already up-to-date.
No valid credentials found. Have you run "snapcraft login"?
(xenial-amd64)ppisati@gloin:~/snapcraft/examples/96boards-kernel$