CL-SOM-iMX7: FreeRTOS: Running Demos

Introduction

This article describes the process of loading FreeRTOS images into memory, and running the in-memory images. For quick evaluation, the FreeRTOS BSP comes with precompiled images that can be found under the images folder.

Loading FreeRTOS into memory

A FreeRTOS image must be run from TCM, DDR, or OCRAM, depending on how it was built. Consult the following table for the right <load_addr> to use:

Image name	Must run from	load_addr
<image_name>.bin	TCM	7F8000
<image_name>_ocram.bin	OCRAM	910000
<image_name>_ddr.bin	DDR	9FF00000

• Power on the module and stop U-Boot from booting Linux by holding Ctrl-c.
• Place the demo image into USB drive or SD-card, and connect it into the evaluation board.
• Use the following U-Boot commands to load the demo image from USB storage:

CL-SOM-iMX7 # usb start
CL-SOM-iMX7 # load usb 0 <load_addr> <image_name>

• Use the following U-Boot commands to load the demo image from SD-card:

CL-SOM-iMX7 # mmc dev 0
CL-SOM-iMX7 # mmc rescan
CL-SOM-iMX7 # load mmc 0 <load_addr> <image_name>

Booting FreeRTOS from memory

• Run the image using the following commands:

CL-SOM-iMX7 # dcache flush
CL-SOM-iMX7 # bootaux <load_addr>

See also

• CL-SOM-iMX7: FreeRTOS: Demos Usage Guide
• FreeRTOS: Introduction to NXP FreeRTOS development
• FreeRTOS website