PREEMPT-RT patches for Jetson Nano

[ajcalderont]

Just for the record, today I tried using the source of the newest L4T 32.2. The results are the same, I am able to compile the kernel and to create an image for the Jetson Nano. However, I am not able to boot using that image.

This is the method I followed using L4T 32.2 sources. My host machine has Ubuntu 18.04.2 and I worked on my home folder:

# Install required packages
sudo apt-get update
sudo apt-get install libncurses5-dev build-essential bc lbzip2

# Work folder
mkdir jetson_nano
cd jetson_nano

# Download L4T Jetson Driver Package:
https://developer.nvidia.com/embedded/dlc/Jetson-210_Linux_R32.2.0-0

# Download L4T Sample Root File System:
https://developer.nvidia.com/embedded/dlc/Tegra_Linux_Sample-Root-Filesystem_Nano

# Download L4T Sources:
https://developer.nvidia.com/embedded/dlc/public_sources_Nano

# Download GCC Tool Chain for 64-bit BSP:
https://developer.nvidia.com/embedded/dlc/l4t-gcc-7-3-1-toolchain-64-bit

# Prepare files
sudo tar xpf Jetson-210_Linux_R32.2.0-0.tbz2
cd Linux_for_Tegra/rootfs/
sudo tar xpf ../../Tegra_Linux_Sample-Root-Filesystem_Nano.tbz2
cd ../../

tar -xvf l4t-gcc-7-3-1-toolchain-64-bit.tar.xz
tar -xjf public_sources_Nano.tbz2
tar -xjf public_sources/kernel_src.tbz2

# Apply PREEMPT-RT patches
cd kernel/kernel-4.9/
./scripts/rt-patch.sh apply-patches

# Build kernel
TEGRA_KERNEL_OUT=jetson_nano_kernel
mkdir $TEGRA_KERNEL_OUT
export CROSS_COMPILE=$HOME/jetson_nano/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-
make ARCH=arm64 O=$TEGRA_KERNEL_OUT tegra_defconfig
make ARCH=arm64 O=$TEGRA_KERNEL_OUT -j4

# Prepare files for creating image
sudo cp jetson_nano_kernel/arch/arm64/boot/Image $HOME/jetson_nano/Linux_for_Tegra/kernel/Image
sudo cp -r jetson_nano_kernel/arch/arm64/boot/dts/* $HOME/jetson_nano/Linux_for_Tegra/kernel/dtb/
sudo make ARCH=arm64 O=$TEGRA_KERNEL_OUT modules_install INSTALL_MOD_PATH=$HOME/jetson_nano/Linux_for_Tegra/rootfs/

cd $HOME/jetson_nano/Linux_for_Tegra/rootfs/
sudo tar --owner root --group root -cjf kernel_supplements.tbz2 lib/modules
sudo mv kernel_supplements.tbz2  ../kernel/

# Create Jetson Nano image
cd ..
sudo ./apply_binaries.sh
sudo ./create-jetson-nano-sd-card-image.sh -o jetson_nano.img -s 12G -r 100

After that, I flashed the resulting image into my micro SD card using Etcher. However, when I tried it in my Jetson Nano it only shows the Nvidia logo, then black screen then Nvidia logo again and so on, in a bootloop.