cmake -DCMAKE_TOOLCHAIN_FILE=./mtk_setup.cmake ..
...
vi /etc/config/system
list server '0.lede.pool.ntp.org'
list server '1.lede.pool.ntp.org'
list server '2.lede.pool.ntp.org'
list server '3.lede.pool.ntp.org'
hwclock -w -f /dev/rtc1
hwclock -r -f /dev/rtc1
hwclock -s -f /dev/rtc1