Tested and added the relevant files to my GitHub account. README tells you all you need to know to get going. SDCC and FreeRTOS versions zipped, and the enclosed project is stripped back to only the Cygnal port. All the original ports are still in the Zip.
Do Not expect support from FreeRTOS or SDCC development teams given this is 18 years old as of todays date. Intended only as a starting point.
In case I change the project name, can be found here.