Hi, I've not found the time to recompile anything yet, but I confirm that
http://people.freedesktop.org/~agd5f/radeon_ucode/k/hawaii_k_smc.bin works with
my MSI Radeon R9 390x. I just renamed it as "hawaii_smc.bin" so the vanilla
code loads it without modification. I'm running "auto/balanced" DPM profile
right now and was able to run the Unigine Valley Benchmark without issues (if
there were issues, I will have had a lockup before anything would have been
displayed).

Sorry for not having tested it before, it looks like I never received a
notification for comment 32.