I successfully installed 1.6.1-release on my Ultra 1.
Now I'm trying to convince it to run current. But I'm having some
trouble even booting the current miniroot.fs.
It starts booting:

..>>NetBSD/sparc64 OpenFirmware Boot, Revision 1.6
and so on...

and starts loading kernel.
But then it fails with:

Watchdog Reset
Externally Initiated Reset

and I'm back to 'ok' prompt.
I was getting the same problems with INSTALL kernel booted
from already functional bsd partition with 1.6.1 installed.
Where is the catch?

jj