Raspberry PI4

Dies ist eine alte Version des Dokuments!

git clone https://github.com/raspberrypi/linux.git
sudo apt install crossbuild-essential-armhf

Hier schauen was der sinnvoll neueste RT Patch ist. Aktuell war es 5.10.90. Diesen herunterladen

git log

und dort nach „5.10.90“ suchen. Beispiel:

commit d3e491a20d152e5fba6c02a38916d63f982d98a5
Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date:   Wed Jan 5 12:40:34 2022 +0100

    Linux 5.10.90
    
    Link: https://lore.kernel.org/r/20220103142053.466768714@linuxfoundation.org
    Tested-by: Salvatore Bonaccorso <carnil@debian.org>
    Tested-by: Guenter Roeck <linux@roeck-us.net>
    Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
    Tested-by: Jon Hunter <jonathanh@nvidia.com>
    Link: https://lore.kernel.org/r/20220104073841.681360658@linuxfoundation.org
    Tested-by: Jon Hunter <jonathanh@nvidia.com>
    Tested-by: Florian Fainelli <f.fainelli@gmail.com>
    Tested-by: Guenter Roeck <linux@roeck-us.net>
    Tested-by: Shuah Khan <skhan@linuxfoundation.org>
    Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
    Tested-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
    Tested-by: Salvatore Bonaccorso <carnil@debian.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Datum merken.

Naechsten commit suchen, der arch/arm/config/bcm2711_defconfig enthaelt suchen und den auschecken.

RT Patch anwenden:

wget "https://mirrors.edge.kernel.org/pub/linux/kernel/projects/rt/5.10/patch-5.10.90-rt60.patch.xz"
xzcat patch-5.10.90-rt60.patch.xz | patch -p1

Konfigurieren:

cd linux
KERNEL=kernel7l
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2711_defconfig

In menuconfig „fully preemptible“ einschalten:

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

Bauen:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs -j24

Installieren:

mkdir mnt
mkdir mnt/fat32
mkdir mnt/ext4
sudo mount /dev/sdb1 mnt/fat32
sudo mount /dev/sdb2 mnt/ext4
sudo env PATH=$PATH make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=mnt/ext4 modules_install
sudo cp mnt/fat32/$KERNEL.img mnt/fat32/$KERNEL-backup.img
sudo cp arch/arm/boot/zImage mnt/fat32/$KERNEL.img
sudo cp arch/arm/boot/dts/*.dtb mnt/fat32/
sudo cp arch/arm/boot/dts/overlays/*.dtb* mnt/fat32/overlays/
sudo cp arch/arm/boot/dts/overlays/README mnt/fat32/overlays/
sudo umount mnt/fat32
sudo umount mnt/ext4

in /boot/cmdline.txt „threadirqsi“ hinzufuegen.
```
apt-get install rtirq-init
```
In /etc/default/rtirq
```
RTIRQ_NAME_LIST="74 73"
```
editieren und
```
RTIRQ_RESET_ALL=1
```
einschalten.