Install u-boot-tools by entering the following commands in the terminal:
sudo apt update sudo apt install u-boot-tools
Description:
companion tools for Das U-Boot bootloader
This package includes the mkimage program, which allows generation of U-Boot images in various formats, and the fw_printenv and fw_setenv programs to read and modify U-Boot's environment.
Homepage: http://www.denx.de/wiki/U-Boot/
Version: 2016.03+dfsg1-6ubuntu2
Section: admin