Tag: preempt-rt
![#Raspberry Pi: Real Time System - Preempt-RT Patching Tutorial for Kernel 4.14.y]( "#Raspberry Pi: Real Time System - Preempt-RT Patching Tutorial for Kernel 4.14.y")
20
Jul - 2018Real Time Systems
8 min | 62995#Raspberry Pi: Real Time System - Preempt-RT Patching Tutorial for Kernel 4.14.y
Real Time Systems | 8 min | 62995
The Preempt-RT tutorial article is the most visited post on my blog. Therefore, I decided to update the tutorial to make it cleaner, and to introduce some other possible modifications and tips for solving problems.
Preempt-RT is a popular patch for the Linux kernel to transform Linux into such a real-time operating system. There is another option to get this done, and that's Xenomai (tutorial and performance tests here).
Tiejun Chen, the main responsible for the official Raspberry-Pi-RT branch, has published a video about Preempt-RT here. It includes tips, results and tests.
Getting the Sour...
![#Raspberry Pi: The N-queens Problem (benchmark) Preempt-RT vs. Standard Kernel]( "#Raspberry Pi: The N-queens Problem (benchmark) Preempt-RT vs. Standard Kernel")
01
Apr - 2018Real Time Systems
5 min | 14541#Raspberry Pi: The N-queens Problem (benchmark) Preempt-RT vs. Standard Kernel
Real Time Systems | 5 min | 14541
N-Queens Problem: A Benchmarking Solver for Raspberry Pi
The N-Queens Problem/Puzzle is a well-known problem that consists of placing N chess queens on an N × N chessboard so that no two queens attack each other. For example, one possible solution to the N-queens problem for N = 4 is the following:
![N-queens problem (N=4)]()
Fig. 1: N-queens problem example (N = 4).
Source: Google Optimization ToolsAs you can see, there aren't two queens on the same row, column or diagonal. Usually t...
![#Rapberry Pi: Preempt-RT Kernel Performance on Rasbperry PI 3 Model B+]( "#Rapberry Pi: Preempt-RT Kernel Performance on Rasbperry PI 3 Model B+")
01
Apr - 2018Real Time Systems
3 min | 12215#Rapberry Pi: Preempt-RT Kernel Performance on Rasbperry PI 3 Model B+
Real Time Systems | 3 min | 12215
The Raspberry Pi 3 Model B+ (Fig. 1) is now on sale and I bought one two weeks ago. The main modifications are the followings:
- A 1.4GHz 64-bit quad-core ARM Cortex-A53 CPU
- Dual-band 802.11ac wireless LAN and Bluetooth 4.2
- Faster Ethernet (Gigabit Ethernet over USB 2.0)
- Power-over-Ethernet support (with separate PoE HAT)
- Improved PXE network and USB mass-storage booting
- Improved thermal management
![Raspberry Pi 3 B+]()
Fig. 1: Raspberry Pi 3 Model B+ The Raspberry Pi uses now the LAN2515 chip from Microchip instead of the LAN9514 for Ethernet and the USB Ports.
If you are looking for some Benchmarkin...
![#Raspberry Pi: Preempt-RT Kernel 4.14.y on Raspberry Pi]( "#Raspberry Pi: Preempt-RT Kernel 4.14.y on Raspberry Pi")
18
Mar - 2018Real Time Systems
1 min | 3059The forked rpi-4.14.y-rt repo by TiejunChina is now a branch under the official Raspberry Pi repo. That means you need to type the following to clone the Preempt-RT patched Kernel
~/rpi-kernel$ git clone https://github.com/raspberrypi/linux.git ~/rpi-kernel$ cd linux ~/rpi-kernel/linux/ git checkout rpi-4.14.y-rtThen, you can follow the tutorial from here.
![#Raspberry PI Zero W: Preempt-RT Kernel Performance]( "#Raspberry PI Zero W: Preempt-RT Kernel Performance")
11
Mar - 2018Real Time Systems
2 min | 8651Today I patched the kernel of a Raspberry Pi Zero W with Preempt-RT. I used the repo TiejunChina.
Update 18.03.2018: The official Preempt-RT patched Rasbian repo is here. ##~/rpi-kernel$ git clone https://github.com/TiejunChina/linux.git # update 18.03.2018: old repository## ~/rpi-kernel$ git clone https://github.com/raspberrypi/linux.git # update 18.03.2018: new repository ~/rpi-kernel$ cd linux ~/rpi-kernel/linux$ git checkout rpi-4.14.y-rt # today the kernel version is 4.14.22 # with rt17 resulting in 4.14.22-rt17+You can find a complet...
![#Raspberry Pi: Preempt-RT Patching Tutorial for Kernel 4.14.y]( "#Raspberry Pi: Preempt-RT Patching Tutorial for Kernel 4.14.y")
26
Feb - 2018Real Time Systems
6 min | 44827You can still read this article, but a new tutorial is available here: There are a lot of tutorials for Raspberry Pi kernel patching using Preempt-RT, but I needed about 15 hours to get it working! I hate Kernel patching! and I have to say, that's not my first time. I have a system working with Ubuntu, RTAI and an Ethercat master. I patched the system more than once. But it is/was always a new thing! and It costs a lot of tim...
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