As I’ve installed ubuntu 18.04 on the Firefly-RK3399, compiling the RK3399 kernel natively is the same process as cross-compiling the kernel.
There is one issue, the custom tools have only been compiled for x86. However, the source is included in with the SoC Vendor Kernel, so it just needs to be copied and recompiled.
The error is:
/bin/sh: 1: ./scripts/mkkrnlimg: Exec format error arch/arm64/Makefile:167: recipe for target 'kernel.img' failed make: *** [kernel.img] Error 2
Assuming ../../rockchip-linux/ is a clone of https://github.com/rockchip-linux/kernel. Update the tools for arm64.
cd firefly-kernel/scripts rm mkkrnlimg cp ../../rockchip-linux/scripts/mkkrnlimg.c make mkkrnlimg rm resource_tool cp ../../rockchip-linux/scripts/resource_tool.c . make resource_tool
Paths will change for the installation
make firmware sudo make modules_install firmware_install INSTALL_FW_PATH=/lib/firmware/
The SD card image device is /dev/mmcblk0
sudo dd if=resource.img seek=32768 of=/dev/mmcblk0 sudo dd if=kernel.img seek=65536 of=/dev/mmcblk0 sync sudo reboot
Updated kernel version:
Linux Firefly-RK3399 4.4.126 #4 SMP Fri Jan 25 22:37:01 ACDT 2019 aarch64 aarch64 aarch64 GNU/Linux
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