wget -c http://mirrors.tuna.tsinghua.edu.cn/archlinuxarm/os//ArchLinuxARM-rpi-latest.tar.gz
#https://archlinuxarm.org/platforms/armv6/raspberry-pi
#https://ladvien.com/installing-arch-linux-raspberry-pi-zero-w/
sh al-wpa-setup.sh wifiname wifipass
sh initchina.sh
#https://medium.com/@dwilkins/usb-gadget-mode-with-arch-linux-and-the-raspberry-pi-zero-e70a0f17730a
sh asusbwifi.sh
#ssh alarm@alarmpi //pass:alarm
#su //pass:root
#run initarch.sh line by line
##"systemctl start dhcpd4" may failed, no matter
#insert "dtoverlay=dwc2" to /boot/config.txt
#reboot
#insert usb, now ssh alarm@192.168.7.3 works
#serial guide
#/etc/modules-load.d/raspberrypi.conf
#g_ether to g_serial
#systemctl enable getty@ttyGS0.service
#host connect via "screen /dev/ttyACM0 115200"
#window use "mode" and putty