http://www.cnx-software.com/2015/10/29/getting-started-with-nodemcu-board-powered-by-esp8266-wisoc/
#get firmware
wget https://github.com/nodemcu/nodemcu-firmware/releases/download/0.9.6-dev_20150704/nodemcu_integer_0.9.6-dev_20150704.bin
#flash firmware
sudo python ./esptool.py --port /dev/ttyUSB0 write_flash 0x00000 ../nodemcu_integer_0.9.6-dev_20150704.bin
###Documentation