How to add bpf support to L4T 32.4.3?

[jiaqing.kuang]

I followed the tips from chatgpt,but it did not work:

Enhanced Guide for NVIDIA Jetson Kernel Update

Step 1: Setup and Download Kernel Sources

1. Install Required Packages:

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sudo apt-get update
sudo apt-get install build-essential bc git libncurses5-dev bison flex libssl-dev

2. Download NVIDIA Jetson Kernel Sources:

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git clone --depth 1 -b tegra-l4t-r32.5.1 https://github.com/nvidia/linux-nvidia.git
cd linux-nvidia

3.Note*: Ensure you use the correct branch/tag corresponding to your L4T version.

Step 2: Extract and Modify the Kernel Configuration

1. Extract Current Configuration:

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zcat /proc/config.gz > .config

2. Copy Configuration to Source Directory:

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cp .config linux-nvidia/
cd linux-nvidia

3. Modify Kernel Configuration:

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make menuconfig

Make your necessary changes (e.g., enabling BPF_SYSCALL).
4. Save the Modified Configuration:

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cp .config .config.modified

Step 3: Build the Kernel

1. Set Up the Environment:

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export ARCH=arm64
export CROSS_COMPILE=aarch64-linux-gnu-

2. Compile the Kernel:

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make -j$(nproc) Image
make -j$(nproc) modules
make -j$(nproc) dtbs

3. Install Kernel Modules:

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sudo make modules_install INSTALL_MOD_PATH=../kernel_modules

Step 4: Deploy the Kernel and Modules

1. Copy the Kernel Image:

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sudo cp arch/arm64/boot/Image /boot/Image

2. Copy the Device Tree Blobs (if necessary):

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sudo cp arch/arm64/boot/dts/*.dtb /boot/

3. Copy the Kernel Modules:

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sudo cp -r ../kernel_modules/lib/modules/$(uname -r)/kernel /lib/modules/$(uname -r)/

Step 5: Update Bootloader (if needed)

Ensure the bootloader (U-Boot) is configured to use the new kernel image if necessary.

Step 6: Reboot and Verify

1. Reboot the System:

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sudo reboot

2. Verify the New Configuration:

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uname -r
zgrep 'BPF' /proc/config.gz

“bpftool feature” command still shows “bpf() syscall is NOT available”,i do have changed the kernel config and set CONFIG_BPF_SYSCALL=y

[KevinFFF]

Hi jiaqing.kuang,

Are you using the devkit or custom board for AGX Xavier?
Please share the result of the following command on your board.

$ cat /etc/nv_tegra_release

Please refer to Kernel Customization — Jetson Linux<br/>Developer Guide 34.1 documentation to build kernel image with BPF related configuration enabled in menuconfig.

[jiaqing.kuang]

R32 (release), REVISION: 4.3, GCID: 21589087, BOARD: t186ref, EABI: aarch64, DATE: Fri Jun 26 04:34:27 UTC 2020

Thanks for your reply

[jiaqing.kuang]

It shows:

R32 (release), REVISION: 4.3, GCID: 21589087, BOARD: t186ref, EABI: aarch64, DATE: Fri Jun 26 04:34:27 UTC 2020

Thanks for your reply

[KevinFFF]

We would suggest verifying with the latest R32.7.5 (L4T 4.6.5).

Are you using the devkit or custom board for AGX Xavier?

[jiaqing.kuang]

how to upgrade to R32.7.5

[KevinFFF]

Are you using the devkit or custom board?

For the devkit, you can simply use SDK Manager to flash and update your board.

For the custom board, please ask your vendor for the custom BSP package and use the flash script to update the board.