theobroma systems RK3399-Q7, User Manual

Page: 29 / 52

cd puma - linux
export ARCH = arm64
export CROSS_COMPILE =/ opt / gcc - linaro - 6.3 . 1 - 2017.02 - x86_64_aarch64 - linux - gnu / bin / aarch64 - linux - gnu -
make puma - rk3399_defconfig
make - j4 rockchip / rk3399 - puma . dtb Image
This will create the two files needed for booting with U-Boot (paths are relative to the
puma-linux
directory):
• The device tree: “
arch/arm64/boot/dts/rockchip/rk3399-puma.dtb
“
• The kernel image: “
arch/arm64/boot/Image
“
4.8 Building the root filesystem
A filesystem can be created using Debootstrap, specifying arm64 as architecture in the command line.
Supposing the target dir is called
rk3399-rootfs
and the chosen distro is xenial (recommended):
export targetdir=/opt/rk3399-rootfs
export distro=xenial
sudo mkdir -p $targetdir
sudo debootstrap --arch=arm64 --foreign $distro $targetdir
Next, copy the qemu-arm-static binary into the right place for the binfmt packages to find it and copy the resolv.conf file
from the host system:
sudo cp /usr/bin/qemu-aarch64-static $targetdir/usr/bin/
sudo cp /etc/resolv.conf $targetdir/etc
This will provide a very basic arm64 rootfs in the targetdir. For the next stages, we
chroot
to the target dir and set up the
environment again:
cd $targetdir
sudo mount -t proc chproc $targetdir/proc
sudo mount -t sysfs chsys $targetdir/sys
sudo mount -t devtmpfs chdev $targetdir/dev
sudo mount -t devpts chpts $targetdir/dev/ptsd
sudo chroot $targetdir
export LC_ALL=C
export LANG=C
RK3399-Q7 User Manual
© Theobroma Systems Design und Consulting GmbH
Release v0.2-3-g574c114
Page 25