Have you tried our OpenFD firmware loader? All new Irazu based SDK's come with OpenFD support!
OpenFD (Open Firmware Deployer) is an open source tool that helps developers to deploy their firmware to a target board in a variety of ways. Most of the steps required to prepare a bootable SD card, flash programming, and other deployment scenarios, can be simplified and automated using OpenFD. It is designed for boards that run U-Boot as their bootloader, Embedded Linux as their kernel component, and requires a GNU/Linux host PC. See it in our Github repository