General donations to Haiku, Inc. will help us replace any money used to support this effort. If you would like to donate directly to X512 his PayPal is listed in this forum post: Call for Haiku Inc. and Haiku community. RISC-V port
More hardware is needed to build a complete computer with the HiFive Unmatched so I am sure X512 would appreciate some help there. He has told me that once he gets the board next week he will start a new forum thread to track his progress.