TechnicallyUnsure

Download Debian BullsEye CLI for Rock 5A from here:
https://www.okdo.com/software-hub/

Burn that into SD Card and boot the Rock 5A / Rock 5A Pink
 
Log into the CLI from the console itself, using mouse and keyboard, or SSH into the Debian

then run these two commands:
apt install ssh ntp
sudo ln -s /lib/systemd/system/ssh.service /etc/systemd/system/sshd.service

TechnicallyUnsure

#!/bin/bash
sudo dpkg --add-architecture armhf
sudo add-apt-repository ppa:liujianfeng1994/panfork-mesa
sudo add-apt-repository ppa:liujianfeng1994/rockchip-multimedia
sudo apt update
sudo apt install build-essential git cmake gcc-arm-linux-gnueabihf libc6-dev-armhf-cross libappindicator1 libnm0 libtcmalloc-minimal4 binfmt-support liblttng-ust-dev libcairo2:armhf libgmp10:armhf libvulkan1:armhf libudev-dev:armhf python3-pip python3-apt python3-debian pandoc -y
cd ~
git clone https://gitlab.com/volian/nala.git
cd nala
sudo make install