raspberry pi serial console + headless setup

- serial console with adafruit cp2104:
https://learn.adafruit.com/adafruit-piuart-usb-console-and-power-add-on-for-raspberry-pi/enabling-serial-console
https://thepihut.com/products/adafruit-piuart-usb-console-and-power-add-on-for-raspberry-pi

https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers
http://www.silabs.com/Support%20Documents/Software/Mac_OSX_VCP_Driver.zip
https://www.silabs.com/community/interface/forum.topic.15.15.html/cp120x_vcp_driverno-G1Bu
https://pqrs.org/osx/karabiner/

/dev/cu.SLAB_USBtoUART
screen /dev/cu.SLAB_USBtoUART 115200


- headless setup
https://learn.adafruit.com/raspberry-pi-zero-creation/install-os-on-to-sd-card
http://www.aymerick.com/2013/09/17/headless_raspberrypi_setup.html

Get some image:
https://www.raspberrypi.org/downloads/raspbian/

$ df -h
$ diskutil list
$ sudo diskutil unmount /dev/disk2s1
$ sudo dd bs=1m if=~/Downloads/2015-11-21-raspbian-jessie-lite.img of=/dev/rdisk2
$ sudo diskutil eject /dev/rdisk2

# e.g.
$ sudo dd bs=1m if=~/Downloads/2018-06-27-raspbian-stretch-lite.img of=/dev/rdisk2
Password:
1776+0 records in
1776+0 records out
1862270976 bytes transferred in 185.178047 secs (10056651 bytes/sec)

$ sudo dd bs=1m if=~/Downloads/2018-06-27-raspbian-stretch.img of=/dev/rdisk2
4597+1 records in
4597+1 records out
4820393984 bytes transferred in 180.294348 secs (26736246 bytes/sec)


# mount second partition on macos
brew cask install osxfuse
brew install ext4fuse
sudo mkdir /Volumes/rpi
sudo ext4fuse /dev/disk2s2 /Volumes/rpi -o allow_other
# work on /Volumes/rpi