Hi
For mankind (for those who will have same issu like me )
I couldn't login through ttyS0 serial console on latest ArmArch Arch_Linux For_BananaPi_v1412.img - i was searching through internets and nothing and suddenly bam this had worked:
$this->bbcode_second_pass_code('', 'setserial /dev/ttyS0 uart 16550A')
reboot
then:
$this->bbcode_second_pass_code('', 'systemctl disable getty@ttyS0
systemctl enable serial-getty@ttyS0')