Raspberry Pi 3B Kernel compilation

1. Preparatory work:

1.1 Development environment System Ubuntu 16 (64-bit)

1.2 Download Source: Https://github.com/raspberrypi

Linux: Raspberry Pi kernel source

Tools: Raspberry Pi cross-compilation tool

Download mode:

(1) Web download

Download zip directly

(2) Command download

git clone--depth=1 Https://github.com/raspberrypi/linux

git clone https://github.com/raspberrypi/tools

Save path is ~/raspberry/under 2. Determine version

2.1 View information about the current Raspberry Pi compiler

root@raspberrypi:~# cat/proc/version

Linux version 4.4.13-v7+ (dc4@dc4-xps13-9333) (gcc version 4.9.3 (crosstool-ng crosstool-ng-1.22.0-88-g8460611)) #894 SM P Mon June 13:13:27 BST 2016

2.2 Determining the cross-compilation tool

root@ubuntu:~/raspberry/tools-master/arm-bcm2708# ls

Arm-bcm2708hardfp-linux-gnueabi

Arm-bcm2708-linux-gnueabi

Arm-rpi-4.9.3-linux-gnueabihf

Gcc-linaro-arm-linux-gnueabihf-raspbian

Gcc-linaro-arm-linux-gnueabihf-raspbian-x64

There are 5 directories under this directory and are different versions of the cross-compilation tool. Where ARM-RPI-4.9.3-LINUX-GNUEABIHF and gcc-linaro-arm-linux-gnueabihf-raspbian-x64 are used for 64-bit machines.

Each cross-compilation tool has a bin directory in the directory to enter, execute./arm-linux-gnueabihf-gcc-v to view the GCC version.

I use ARM-RPI-4.9.3-LINUX-GNUEABIHF here because the GCC version on the board is now 4.9.3 3. Start compiling

3.1 Enter the Linux kernel directory:

$ CD ~/RASPBERRY/LINUX-RPI-4.4.Y

$ kernel=kernel7

$ make Arch=arm cross_compile=~/raspberry/tools-master/arm-bcm2708/arm-rpi-4.9.3-linux-gnueabihf/bin/ Arm-linux-gnueabihf-bcm2709_defconfig

Note: If the multi-processing system can add an option-j N, n is a number that represents the number of multiprocessor *1.5. Can speed up compilation

$ make-j4 zimage Modules Dtbs

3.2 Creating a directory Modules

Create the modules directory at the top level of the Linux kernel directory.

$ mkdir Modules

$ make Install_mod_path=modules Modules_install

3.3 Update first the Raspberry Pi kernel will have the system memory card plugged into the computer:

Two directories will appear under the/media/ubuntu/directory boot/2f840c69-cecb-4b10-87e4-01b9d28c231c/

Execute command

sudo cp arch/arm/boot/zimage/media/ubuntu/boot/$ (KERNEL). img

sudo cp arch/arm/boot/dts/*.dtb/media/ubuntu/boot/

sudo cp arch/arm/boot/dts/overlays/*.dtb*/media/ubuntu/boot/overlays/

sudo cp arch/arm/boot/dts/overlays/readme/media/ubuntu/boot/overlays/

CP modules/lib//media/ubuntu/2f840c69-cecb-4b10-87e4-01b9d28c231c/ -R 4. Restart the Raspberry Pi, successfully updated the kernel

Reference connection: HTTPS://WWW.RASPBERRYPI.ORG/DOCUMENTATION/LINUX/KERNEL/BUILDING.MD