Linux mainline support

[numbqq]

@vrabac

Keep us informed about mainline support (u-boot, kernel etc) .

Mainline u-boot merged to the master branch

arm64: dts: rockchip: Add support for Khadas Edge

Build and install with:

Mainline U-Boot works with LPDDR4 patch series

Final update: all the required support is now in mainline u-boot, including the device trees from Nick @numbqq . Build and install with git clone https://gitlab.denx.de/u-boot/u-boot.git cd u-boot git clone https://github.com/ARM-software/arm-trusted-firmware.git atf make -C atf CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399 bl31 cp atf/build/rk3399/release/bl31/bl31.elf bl31.elf make khadas-edge-rk3399_defconfig make ARCH=arm CROSS_COMPILE=aarch64-linux-gnu- tools/mkimage -n rk3399 -T rksd -d tp…