====== openwrt ======

cloning repo

  git clone https://www.github.com/frank-w/openwrt
  cd openwrt

installing depencies:

  ./scripts/feeds update -a
  ./scripts/feeds install -a

configuration:

  make menuconfig
  => Target System (MediaTek Ralink ARM)
  => Subtarget (MT7623)
  => Target Profile (Bpi Banana Pi R2) 
  => Target Images
     => tar.gz

edit Makefile to change Kernel from 4.19 to 5.4 (already done in my repo)

  nano target/linux/mediatek/Makefile
  => KERNEL_PATCHVER:=5.4
  make -j8 kernel_menuconfig