Debian (sid): http://repos.rcn-ee.net/debian-riscv64/
deb [arch=riscv64] http://repos.rcn-ee.net/debian-riscv64/ sid main
#deb-src [arch=riscv64] http://repos.rcn-ee.net/debian-riscv64/ sid main
keyring:
apt-key adv --keyserver keyserver.ubuntu.com --recv-key D284E608A4C46402