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Merge pull request #18 from elkoniu/cm4-kernel-build-update
Kernel: Update kernel build routine for CM4 version
This commit is contained in:
GNU
GitHub
commit
42748a8173
@ -1,69 +1,37 @@
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# Patch for uConsole CM4
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# uConsole CM4 kernel sources
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uConsole kernel is based on Raspberry Pi kernel sources:
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`https://github.com/raspberrypi/linux.git`
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based on `https://github.com/raspberrypi/linux.git`
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The current version is based on top of commit hash:
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`3a33f11c48572b9dd0fecac164b3990fc9234da8`
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commit hash: 3a33f11c48572b9dd0fecac164b3990fc9234da8
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## Prepares
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ubuntu 22.04 with aarch64-linux-gnu-
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```
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sudo apt install -y build-essential gcc-aarch64-linux-gnu
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```
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## Example process of compiling
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```
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cd
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git clone https://github.com/raspberrypi/linux.git
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cd linux
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wget https://raw.githubusercontent.com/clockworkpi/uConsole/master/Code/patch/cm4/20230630/0001-patch-cm4.patch
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git reset --hard 3a33f11c48572b9dd0fecac164b3990fc9234da8
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git apply 0001-patch-cm4.patch
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KERNEL=kernel8 make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- bcm2711_defconfig
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# Build
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KERNEL=kernel8 make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j2
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Kernel build can be performed on Ubuntu 22.04 with aarch64 cross compilation.
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To automate this process `build-kernel.sh` script has been created.
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It will automatically install all needed dependencies on for kernel building
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both from RPi and Ubuntu guidelines.
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mkdir ./modules
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On top of the RPi kernel - uConsole specific patch is applied. It contains
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implementation of all required drivers like video driver for uConsole screen.
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rm -rf ./modules/*
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To automate build process on environmend different than Ubuntu 22.04 `run.sh`
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script has been created. It utilizes docker container for building the kernel
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using build script.
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INSTALL_MOD_PATH=./modules make modules_install
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Final results are located in `out` directory in the source tree.
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rm modules/lib/modules/*/build
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# Deploy
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rm modules/lib/modules/*/source
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To deploy build result use content of `out` directory and copy it over
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to the right locations on SD card. More you can find in official RPi guide:
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```
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https://www.raspberrypi.com/documentation/computers/linux_kernel.html
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## config.txt
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# Kernel configuration
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In order to use compiled kernel8.img with CM4 in uConsole ,we have to setup a config.txt
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In order to use compiled kernel8.img with CM4 in uConsole, we have to setup
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a `config.txt` configuration file. It contains various options which will be
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```
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passed to runtime kernel for proper uConsole specific drivers initialization.
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disable_overscan=1
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dtparam=audio=on
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[pi4]
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max_framebuffers=2
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[all]
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ignore_lcd=1
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dtoverlay=dwc2,dr_mode=host
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dtoverlay=vc4-kms-v3d-pi4,cma-384
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dtoverlay=devterm-pmu
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dtoverlay=devterm-panel-uc
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dtoverlay=devterm-misc
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dtoverlay=audremap,pins_12_13
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dtparam=spi=on
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gpio=10=ip,np
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dtparam=ant2
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```
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105
Code/patch/cm4/20230630/build-kernel.sh
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105
Code/patch/cm4/20230630/build-kernel.sh
Executable file
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#!/bin/bash
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set -eox pipefail
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# Create working directory
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mkdir -p /uConsole
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cd /uConsole
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# Install dependencies
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apt update
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# Base kernel build dependencies
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apt install -y build-essential \
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gcc-aarch64-linux-gnu \
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linux-headers-generic
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# Install RPi kernel build dependencies
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# [https://www.raspberrypi.com/documentation/computers/linux_kernel.html]
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apt install -y git \
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bc \
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bison \
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flex \
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libssl-dev \
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make \
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libc6-dev \
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libncurses5-dev \
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crossbuild-essential-arm64
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# Other possible usefull dependencies suggested by Ubuntu kernel building guide
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# [https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel]
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apt install -y libncurses-dev \
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gawk \
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openssl \
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libssl-dev \
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dkms \
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libelf-dev \
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libudev-dev \
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libpci-dev \
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libiberty-dev \
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autoconf \
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llvm
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# Clone Raspberry kernel sources
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if [ ! -d "linux" ] ; then
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git clone https://github.com/raspberrypi/linux.git
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fi
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cd linux
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# Linux repo may be already cloned in previous run so we need to remove
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# any existing files modifications / applied patches
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git clean -f
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# Use specified source version
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git reset --hard 3a33f11c48572b9dd0fecac164b3990fc9234da8
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# Apply uConsole specific patch
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git apply ../0001-patch-cm4.patch
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# Config for Raspberry Pi 3, 3+, 4, 400 and Zero 2 W, and Raspberry Pi
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# Compute Modules 3, 3+ and 4 default 64-bit build configuration:
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# - bcm2711_defconfig
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# - kernel8
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#
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# KERNEL=kernel8 make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- bcm2711_defconfig
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# KERNEL=kernel8 make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j4
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#
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# [https://www.raspberrypi.com/documentation/computers/linux_kernel.html]
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export KERNEL=kernel8
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export ARCH=arm64
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export CROSS_COMPILE=aarch64-linux-gnu-
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# Generate .config file
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make bcm2711_defconfig
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# Build kernel
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make -j4
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# Prepare placeholder for kernel modules
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mkdir -p ./modules
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rm -rf ./modules/*
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# Deploy modules in predefined location
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INSTALL_MOD_PATH=./modules make modules_install
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# Remove unused module files
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rm ./modules/lib/modules/*/build
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rm ./modules/lib/modules/*/source
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# Export build artifacts: kernel modules
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mkdir -p ../modules
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rm -rf ../modules/*
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cp -rav ./modules/* ../modules
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# Export build artifacts: kernel + device tree
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mkdir -p ../out
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rm -rf ../out/*
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mkdir -p ../out/overlays
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sudo cp arch/arm64/boot/Image ../out/$KERNEL.img
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sudo cp arch/arm64/boot/dts/broadcom/*.dtb ../out
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sudo cp arch/arm64/boot/dts/overlays/*.dtb* ../out/overlays/
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sudo cp arch/arm64/boot/dts/overlays/README ../out/overlays/
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17
Code/patch/cm4/20230630/config.txt
Normal file
17
Code/patch/cm4/20230630/config.txt
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disable_overscan=1
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dtparam=audio=on
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[pi4]
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max_framebuffers=2
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[all]
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ignore_lcd=1
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dtoverlay=dwc2,dr_mode=host
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dtoverlay=vc4-kms-v3d-pi4,cma-384
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dtoverlay=devterm-pmu
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dtoverlay=devterm-panel-uc
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dtoverlay=devterm-misc
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dtoverlay=audremap,pins_12_13
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dtparam=spi=on
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gpio=10=ip,np
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dtparam=ant2
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10
Code/patch/cm4/20230630/run.sh
Executable file
10
Code/patch/cm4/20230630/run.sh
Executable file
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#!/bin/bash
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# To be able to build kernel modules container needs to run in privileged mode
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# [https://projectatomic.io/blog/2018/06/building-kernel-modules-with-podman/]
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# Spawn container and run build script
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docker run --rm --privileged -v ./:/uConsole ubuntu:22.04 /bin/bash /uConsole/build-kernel.sh
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# Start container to run build script manually
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# docker run -it --rm --privileged -v ./:/uConsole ubuntu:22.04
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