Trucrux Inc

Universal Update Utility (UUU) Usage Guide for Trucrux IMX8M SOMs

UUU (Universal Update Utility) is an open-source tool developed by NXP for downloading and executing code on i.MX SoCs via the Serial Download Protocol (SDP). It allows loading SPL and U-Boot via the USB OTG port and optionally programming the internal storage of the SOM.


Download and build UUU #
$ sudo apt-get install libusb-1.0-0-dev libbz2-dev libzstd-dev pkg-config cmake libssl-dev g++
$ cd ~
$ git clone
$ cd mfgtools
$ git checkout uuu_1.4.240
$ cmake .
$ make
Build U-Boot #

Copy the U-Boot image to the uuu directory:

$ cp -v imx-boot-sd.bin ~/mfgtools/uuu/_flash.bin
Boot the board into serial download mode: #

Set the board boot mode to SD card, while not having an actual card inserted in its slot.

Alternatively, set the board boot mode to eMMC/NAND flash when the eMMC/NAND flash does not contain a bootloader.
Connect the board to your host PC via the USB OTG port and power on the board. The board should be recognized on the host as a “NXP Semiconductors SE Blank M850” (or something similar).

Run UUU to load U-Boot #
$ cd ~/mfgtools/uuu
$ sudo ./uuu ./spl_boot.lst

Note: The board should now run U-Boot. You can see its output on the console via the debug port, as always.