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V4L2 mode for Raspberry Pi (view source)
Revision as of 16:43, 4 January 2021
, 16:43, 4 January 2021→Source code cross compilation
The following operations are done on ubuntu PC.
The following operations are done on ubuntu PC.
==== '''Build cross-compilation environment on Ubuntu 64-bitoperating system)''' ====
<code>sudo apt install git bc bison flex libssl-dev make libc6-dev libncurses5-dev</code>
<code>sudo apt install crossbuild-essential-armhf</code>
==== Download the standard version of the piOS source code ====
===== Confirm the piOS version of your raspberry Pi =====
<code>$ uname -a</code>
<code>Linux raspberrypi 5.4.72-v7l+ #1356 SMP Thu Oct 22 13:57:51 BST 2020 armv7l GNU/Linux</code>
===== There are two ways to get the source code of the version you want: =====
# using git to clone the corresponding branch and checkout the corresponding tag.
<code>git clone --branch rpi-5.4.y <nowiki>https://github.com/raspberrypi/linux</nowiki></code>
<code>git checkout raspberrypi-kernel_1.20201022-1</code>
2. Manually download the version code of the corresponding tag directly from the link below.
https://github.com/raspberrypi/linux/tags
==== 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.
==== Building ====
==== Preparing ====
<code>export ARCH=arm</code>
<code>export CROSS_COMPILE=arm-linux-gnueabihf-</code>
* Raspberry Pi 1, Pi Zero, Pi Zero W, and Compute Module default build configuration
<code>KERNEL=kernel</code>
<code>make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcmrpi_defconfig</code>
* Raspberry Pi 2, Pi 3, Pi 3+, and Compute Module 3 default build configuration
<code>KERNEL=kernel7</code>
<code>make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2709_defconfig</code>
* Raspberry Pi 4 default build configuration
<code>KERNEL=kernel7l</code>
<code>make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2711_defconfig</code>
==== Add compilation options ====
<code>make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig</code>
Add the compilation options by the corresponding camera module, the path is driver-- > multimedia-- > i2C.
===== Build =====
<code>make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs -j4</code>
=== References ===
<nowiki>https://www.raspberrypi.org/documentation/linux/kernel/building.md</nowiki>