Please answer these questions before submitting your issue. Thanks!

1. What version of Go are you using (go version)?
   go version devel +c63dbd8 Thu Mar 10 18:35:10 2016 +0000 linux/ppc64le
   Doesn't work on any earlier versions either.
2. What operating system and processor architecture are you using (go env)?
   ppc64le
3. What did you do?
   If possible, provide a recipe for reproducing the error.
   A complete runnable program is good.
   A link on play.golang.org is best.
   go tool objdump a.out
4. What did you expect to see?
   A disassembly of the program.
5. What did you see instead?
   objdump: disassemble a.out: unsupported architecture

I've seen a CL for this from Minux a while ago but haven't seen any recent updates.
If this was started but needs finishing I could help with that.