XELK-AN-001: Asymmetric Multiprocessing (AMP) on Axel – Linux + FreeRTOS
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Contents
History[edit | edit source]
| Version | Date | XELK version | Notes |
|---|---|---|---|
| 0.9.2 | Feb 2015 | 2.0.0 | Update for XELK 2.0.0 release |
| 0.9.3 | April 2015 | 2.0.0 | Minor fixes |
| 1.0.0 | April 2018 | 2.1.0 | Updated info for command erros |
Introduction[edit | edit source]
This application note describe how to build the software components required to set up asymmetric multi-processing (AMP for short) configuration required to run Linux OS on first Cortex®-A9 core and FreeRTOS on second Cortex®-A9 core of the Freescale i.MX6 SOC. The latencystat demo is a RPMsg-based application that exploits sophisticated techniques to handle inter-processors communication and synchronization.
Please download the application note in PDF format for the overall information.
Downloading,configuring and building[edit | edit source]
Assuming that a local repository has not been created, clone the remote AMPgit repository (the -b option is used to automatically checkout the current branch):
dvdk@dvdk:~/xelk$ git clone git@git.dave.eu:dave/axel/linux-2.6-imx.git
- Enter the git directory
- Switch to AMP branch:
dvdk@dvdk:~/xelk/linux-2.6-imx$ git checkout axel-feat-2.1.0-amp
Build the Linux kernel[edit | edit source]
Set the correct environment sourcing the iMX6 toolchain:
dvdk@dvdk:~/xelk$ source env.sh
Select the Axel board configuration:
dvdk@dvdk:~/xelk/linux-2.6-imx$ make imx_v7_axel_defconfig
build the Linux kernel and the XELK-L-S device tree:
dvdk@dvdk:~/xelk/linux-2.6-imx$ make UIMAGE_LOADADDR=0x18008000 imx6q-xelk-l.dtb uImage modules
Build FreeRTOS[edit | edit source]
Clone the FreeRTOS repository and build the real-time OS:
dvdk@dvdk:~/xelk$ git@git.dave.eu :dave/axel/freertos.git dvdk@dvdk:~/xelk$ cd freertos
For building the FreeRTOS, a proper toolchain has to be used:
dvdk@dvdk:~/xelk/freertos$ export PATH=<path to arm-eabi toolchain>/bin:$PATH dvdk@dvdk:~/xelk/freertos$ export ARCH=arm dvdk@dvdk:~/xelk/freertos$ export CROSS_COMPILE=arm-none-eabi- and then run <code>make</code> to build the RTOS binary image: <pre> dvdk@dvdk:~/xelk/freertos$ make
Building latencystat[edit | edit source]
Just clone, enter the latecystat directory and build with make:
dvdk@dvdk:~/xelk$ git@git.dave.eu :dave/axel/latencystat.git dvdk@dvdk:~/xelk$ cd latencystat dvdk@dvdk:~/xelk/latencystat$ make
Running the AMP on the target[edit | edit source]
move the device tree binary load address (the default 0x18000000 conflicts the AMP kernel loadaddr, it must be moved to a higher address) by changing u-boot environment for example as:
=> setenv fdtaddr 0x1c000000
