Build drivers from source for rpi

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The main resources in this section are the official piOS building method.

We provide methods to compile locally on Raspberry Pi and cross-compile on PC. It is recommended to use Raspberry Pi local compilation, which is simpler and faster.

2 Cross-Compiling the Drivers

The following operations are done on ubuntu PC.

2.1 Build cross-compilation environment on Ubuntu 64-bit operating system)

sudo apt install git bc bison flex libssl-dev make libc6-dev libncurses5-dev

• 32-bit piOS target version

sudo apt install crossbuild-essential-armhf

• 64-bit piOS target version

sudo apt install crossbuild-essential-arm64

2.2 Download the standard version of the piOS source code

2.2.1 Confirm the piOS version of your raspberry Pi

• Release version

$ uname -a

Linux raspberrypi 5.4.72-v7l+ #1356 SMP Thu Oct 22 13:57:51 BST 2020 armv7l GNU/Linux

• Code tag

$ cp /usr/share/doc/raspberrypi-bootloader/changelog.Debian.gz ./

gunzip changelog.Debian.gz

Check the top lines and you will know the tag.

2.2.2 There are two ways to get the source code of the version you want:

1. using git to clone the corresponding branch and checkout the corresponding tag.

git clone --branch rpi-5.4.y https://github.com/raspberrypi/linux

git checkout raspberrypi-kernel_1.20201022-1

PS: Please replace the above two commands with your own corresponding versions.

2. Manually download the version code of the corresponding tag directly from the link below.

https://github.com/raspberrypi/linux/tags

2.3 Patch our code to kernel

• Driver source code

camera driver path is ： linux/drivers/media/i2c，copy our camera module drivers to this path.

• Modify the the Makefile and Kconfig files

Modify the Config and Makefile in the same path，add the corresponding camera driver.

• dts file

dts file path is ：linux/arch/arm/boot/dts/overlays，copy our [camera]-overlay.dts files to this path.

• Modify dts Makefile

Modify the Makefile in the same path，add the corresponding dts compilation option.

2.4 Building

2.4.1 Preparing

• For Raspberry Pi 1, Zero and Zero W, and Raspberry Pi Compute Module 1 default (32-bit only) build configuration

KERNEL=kernel

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcmrpi_defconfig

• For Raspberry Pi 2, 3, 3+ and Zero 2 W, and Raspberry Pi Compute Modules 3 and 3+ default 32-bit build configuration

KERNEL=kernel7

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2709_defconfig

• For Raspberry Pi 4 and 400, and Raspberry Pi Compute Module 4 default 32-bit build configuration

KERNEL=kernel7l

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2711_defconfig

• For Raspberry Pi 3, 3+, 4, 400 and Zero 2 W, and Raspberry Pi Compute Modules 3, 3+ and 4 default 64-bit build configuration

KERNEL=kernel8

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- bcm2711_defconfig

2.4.2 Add compilation options

• 32-bit version

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig

• 64-bit version

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- menuconfig

Add the compilation options by the corresponding camera module, for 5.4 version kernel the path is driver-- > multimedia-- > i2C.

For 5.10 version kernel,the path is Device Drivers --> Multimedia Support --> Media ancillary drivers --> Camera sensor devices.

2.4.3 Build

• 32-bit version

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs -j4

• 64-bit version

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- Image modules dtbs -j4

3 References

https://www.raspberrypi.org/documentation/linux/kernel/building.md

4 Document History

• 20220411

Add description of MV series.