Generic AArch64 Installation

This installation contains the base Arch Linux ARM userspace packages and default configurations found in other installations, with the mainline Linux kernel.
This is intended to be used by developers who are familiar with their system, and can set up the necessary boot functionality on their own.
Download the latest tarball: http://os.archlinuxarm.org/os/ArchLinuxARM-aarch64-latest.tar.gz
Extract as the root user (not via sudo) using bsdtar to preserve extended attributes and ACLs:
```
bsdtar -xpf ArchLinuxARM-aarch64-latest.tar.gz -C mountpoint
```
The kernel package (linux-aarch64) provides both an EFI-stubbed Image file that can be directly booted, along with an Image.gz, located in /boot.
All dtb files can be found in /boot/dtbs, with files for those systems currently supported in the mainline kernel.
The default configuration of the userspace is:
- Packages in the base group, kernel firmware and utilities, openssh, and haveged
- Default root password is root
- A normal user account named alarm is set up, with the password alarm
- sshd started (note: system key generation may take a few moments on first boot)
- haveged started to provide entropy
- systemd-networkd DHCP configurations for eth0 and en* ethernet devices
- systemd-resolved management of resolv.conf
- systemd-timesyncd NTP management
After booting, initialize the pacman keyring and populate the Arch Linux ARM package signing keys:
```
pacman-key --init
pacman-key --populate archlinuxarm
```

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