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rpi-kernel-rt's Introduction

rpi-kernel-rt

Binary kernel builds based on -rt branches of https://github.com/raspberrypi/linux/

Installing these builds can make your SD card non-bootable, so make sure to backup your current kernel build and any critical information on your SD card!

Downloading prebuilt archives

Go to https://github.com/BlokasLabs/rpi-kernel-rt/releases, download one of the releases and extract it to /, for example:

# Back up current kernel first.
sudo cp /boot/kernel.img /boot/kernel.img.bak
sudo cp /boot/kernel7.img /boot/kernel7.img.bak

# Download and extract RT kernel.
curl -L -J https://github.com/BlokasLabs/rpi-kernel-rt/archive/v4.14.91-rt49.tar.gz -o kernel-rt.tar.gz
sudo tar -xvf kernel-rt.tar.gz --strip 1 -C /

Manual building

Prerequisities

Set up the cross compiler toolchain as described on Install Toolchain section of https://www.raspberrypi.org/documentation/linux/kernel/building.md.

Steps

  1. Run ./build.sh
  2. Wait for ages
  3. The build result will be in build/ folder. build/lib contents should go to /lib/ and build/boot should go to /boot/ on the SD card.

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rpi-kernel-rt's Issues

missing 'System.map' + multiple definition of `yylloc'

After installing all needed Packages I tried to run the Code. After a while I got those Errors:

/usr/bin/ld: scripts/dtc/dtc-parser.tab.o:(.bss+0x10): multiple definition of `yylloc'; scripts/dtc/dtc-lexer.lex.o:(.bss+0x0): first defined here
collect2: error: ld returned 1 exit status
make[2]: *** [scripts/Makefile.host:99: scripts/dtc/dtc] Fehler 1
  UPD     include/generated/asm-offsets.h
make[1]: *** [scripts/Makefile.build:544: scripts/dtc] Fehler 2
make: *** [Makefile:1061: scripts] Fehler 2
make: *** Auf noch nicht beendete Prozesse wird gewartet …
  CALL    scripts/checksyscalls.sh
  DEPMOD  4.19.71-rt24-v7l+
Warning: modules_install: missing 'System.map' file. Skipping depmod.
cp: Aufruf von stat für 'Module.symvers' nicht möglich: Datei oder Verzeichnis nicht gefunden
cp: Aufruf von stat für 'System.map' nicht möglich: Datei oder Verzeichnis nicht gefunden
cp: Aufruf von stat für 'arch/arm/boot/zImage' nicht möglich: Datei oder Verzeichnis nicht gefunden
cp: Aufruf von stat für 'arch/arm/boot/dts/*.dtb' nicht möglich: Datei oder Verzeichnis nicht gefunden
cp: Aufruf von stat für 'arch/arm/boot/dts/overlays/*.dtb*' nicht möglich: Datei oder Verzeichnis nicht gefunden
depmod 4.19.71-rt24-v7+
depmod 4.19.71-rt24+
depmod 4.19.71-rt24-v7l+

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