Hey Guys
Just a heads up.
If you upgrade (pacman -Suy) a odroid-c2, you need to add SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1 to the "setenv bootargs" line in /boot/boot.ini. Mine ended up looking like this:
setenv bootargs "root=/dev/mmcblk0p1 rootwait rw ${condev} no_console_suspend hdmimode=${m} ${cmode} m_bpp=${m_bpp} vout=${vout} fsck.repair=yes net.ifnames=0 elevator=noop disablehpd=${hpd} max_freq=${max_freq} maxcpus=${maxcpus} monitor_onoff=${monitor_onoff} disableuhs=${disableuhs} mmc_removable=${mmc_removable} usbmulticam=${usbmulticam} ${hid_quirks} SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1"
All credit for this goes to the main man Xogium on the irc channel for guiding me to fixing it.