Pentax K-5 also uses FR based LSI. With same two CPUs (called CPU and DSP to be exact).
Download here - fr.zip
Extract and copy to your IDA Free folder.
Note - module has one nasty bug making Access violation error during initial database forming.
Temporary solution - use IDA 4.9 Free to make initial database and load it in IDA 5.0 for later work.
Contact me if you want to help with improved FR module for IDA Pro 5.0 Free.
Disassembling instructions will be added later.