However, if you use the environment, be prepared for a panic. LinuxPPC does not have the same concept of a kernel panic as the ia32 architecture does. This makes debugging very painful. You cannot setup UDI drivers and this means you load the UDI environment. You can still use the udibuild tool to give you good ideas on where you need to fix your code to make your driver 64-bit clean.
Ports are in progress.
RedHat 6.2 for x86, Kernel 2.2.14-5.0. Caldera OpenLinux eServer 2.3, Kernel 2.2.14. The generated binaries may or may not work with other versions of each distribution, or even other Linux distributions. Note that this should not be considered a deficiency. The UDI source tree itself does not depend on any particular distribution of Linux.