- Documentation/devicetree in the kernel sourcecode.
- PNP Device IDs
- Sun's IEEE1275 Open Firmware site
The Device Tree Compiler used to generate Open Firmware style device trees images is contained in the Fedora and openSUSE dtc rpm.
MIPS Platforms with Device Tree support
to DT is in progress and there is a git tree (linux-dt.git gitweb) for this project.