On Thu, Jan 21, 2016 at 11:54:51PM +1100, Michael Ellerman wrote:

There is no dmesg :)

It gets stuck in early_setup() before the console is even found.

Confirmed.
| Device tree struct  0x00000000014b0000 -> 0x00000000014c0000
| Quiescing Open Firmware ...
| Booting Linux via __start() ...
and that's it.

gcc-6 --version
gcc-6 (SUSE Linux) 6.0.0 20160108 (experimental) [trunk revision 232162]

Also I'm using gcc 6.0 built from mainline just last week, and binutils
similarly. So possibly that is part of the problem.

Confirmed. It _is_ the problem.
mcount call sites look normal on first sight...

	Torsten