[console speed] Inherit console speed from install environment#1987

Merged

lguohan merged 3 commits intosonic-net:masterfrom

keboliu:serial-port-baudrate

Sep 1, 2018

Commits on Aug 27, 2018

pick up console speed from install enviroment
Kebo Liu
committed

Commits on Aug 28, 2018

get console speed from /proc/cmdline
Kebo Liu
committed

Commits on Aug 31, 2018

add CONSOLE_PORT handle
Kebo Liu
committed