i.MX 8QuadXPlus Multisensory Enablement Kit (MEK) is a NXP development
platform based on Cortex A-35 + Cortex-M4 cores. Built with high-level integration
to support graphics, video, image processing, audio, and voice functions, the i.MX
8X processor family is ideal for safety-certifiable and efficient performance
This tutorial shows how to enable the Cortex-M4 using the MCUXpresso SDK package and loading the binary from the network.
NOTE: It is also possible to load the Cortex-M4 image from the SCFW using the
imx-mkimage utility. Please see next blog posts for this tutorial.
Setting up the machine
NOTE: This shows the procedure for a Linux environment. For the Windows OS, please see the Getting Started documentation on the SDK package.
cmakeon the host machine:
$ sudo apt-get install cmake
- Download the
armgcctoolchain from here and export the location as
$ export ARMGCC_DIR=<your_path_to_arm_gcc>/gcc-arm-none-eabi-5_4-2016q2/
ARMGCC_DIR variable needs to be exported on the terminal used
To setup the TFTP server on the host machine, follow the first two sections on this blog post (Configuring your Host PC for TFTP and Configuring your Host PC for NFS).
Downloading the SDK
Download the MCUXpresso SDK following these steps:
Click on “Select Development Board”;
MEK-MIMX8QXunder “Select a Device, Board, or Kit” and click on “Build MCUXpresso SDK” on the right;
Select “Host OS” as
Linuxand “Toolchain/IDE” as
GCC ARM Embedded;
Add “FreeRTOS” and all the wanted Middleware and hit “Request Build”;
Wait for the SDK to build and download the package.
Building the image
All demos and code examples available on the SDK package are located in the
<<SDK_dir>>/boards/mekmimx8qx/. This tutorial shows how to build
and flash the
hello_world demo but similar procedures can be applied for any
example (demo, driver, multicore, etc) on the SDK.
- To build the demo, enter the armgcc folder under the demo directory and make
sure that the
ARMGCC_DIRvariable is set correctly.
$ cd ~/SDK_2.3.0_MEK-MIMX8QX/boards/mekmimx8qx/demo_apps/hello_world/armgcc $ export ARMGCC_DIR=<your_path_to_arm_gcc>/gcc-arm-none-eabi-5_4-2016q2/
- Run the
build_release.shscript to build the code.
NOTE: If needed, give the script execution permission by running
chmod +x build_release.sh.
- This generates the M4 binary (
hello_world.bin) under the release folder. Copy this image to the /tftpboot/ directory on the host PC.
NOTE: This procedure shows how to build the M4 image that runs on TCM. To run
the image from DDR, use the
build_ddr_release.sh script to build the binary under
the ddr_release folder.
Flashing the image
Open two serial consoles, one for
/dev/ttyUSB0for Cortex-A35 to boot Linux, and one for
/dev/ttyUSB1for Cortex-M4 to boot the SDK image.
On the A35 console, with a SD Card with U-Boot, stop the booting process and enter the following commands to load the M4 binary to TCM:
=> dhcp => setenv serverip <ip_from_host_pc> => tftp 0x88000000 hello_world.bin => dcache flush => bootaux 0x88000000
Then the M4 core will load the image to the