Currently I have information about a port for the Palm 5 and nothing about the Palm 3 series.
PLPtools - Matt's work on User-Space UNIX-Psion tools
The Linux7k is a project to port the unix-like operating system Linux to a small group of palmtops. The "7k" in the name comes from the processor 'macrocell' (central architecture), which is the Cirrus Logic PS-7110 chip. This architecture is currently used in the Psion Series 5 and Geofox One palmtops.