download firmware_armstub.zip
,
uncompress and upgrade.
[PC]$ unzip firmware_armstub.zip
[PC]$ sudo mount /dev/mmcblk0p1 /mnt/tmp
[PC]$ sudo cp firmware_armstub/* /mnt/tmp/
[PC]$ sudo apt-get install gcc-aarch64-linux-gnu
compile, copy config.txt and *.bin to microSD.
[PC]$ cd <sample_source_dir>
[PC]$ make
[PC]$ sudo cp ocnfig.txt /mnt/tmp/
[PC]$ sudo cp *.bin /mnt/tmp/kernel8.img