The Wiki of Unify contains information on clients and devices, communications systems and unified communications. - Unify GmbH & Co. KG is a Trademark Licensee of Siemens AG.
The open source software u-boot is part of the OpenStage telephones in this list.
An overview of all used open source software on OpenStage telephones you find in the category page.
Modified compared to Original
This is a derived work based originally on version 1.1.3 of u-boot from denx but now heavily modified into an Openstage specific bootloader.