During the NuttX Workshop a friend (Thiago Costa Paiva) suggested about the idea of creating a FPGA solution to validate NuttX hardware, but his idea didn't take place.
Adding hardware raises complexities or design, manufacturing, distribution, and support. Not insumountble, but not simple either.
A minor correction: We do not validate hardware, we validate ONLY software. Any hardware is part of the trusted test harness and not a part of the unit under test. Software is the unit under test.