release bundling failed in /src/distrib

Hi!

I am trying to build a release in a Sunfire T2000 UltraSparc T1.

...
install: rename: /mnt/INS@6UjHYKPFeu to /mnt/bsd: No such file or directory
***Error 1 in target 'bsd.rd'
...
writing boot block to disk vnd0
installboot: pwrite: Device not configured

**** Error 1 in target 'installboot'
**** Error 1 in /usr/src/distrib/sparc64/miniroot (Makefile:43 'installboot)
**** Error 1 in (Makefile:36 'bsd.rd')
**** Error 2 in /usr/src/distrib/sparc64 (<bsd.subdir.mk>:48 'all')
**** Error 2 in /usr/src/distrib/ (<bsd.subdir.mk>:48 'all')
**** Error 2 in . (Makefile:292 'distrib')
**** Error 2 in . (Makefile:268 'do-release')
**** Error 2 in /usr/src/etc (Makefile:251 'release')
...Then the build stops.

Needless to say, if I issue cd /usr/src/distrib/sets && sh checkflist
afterwards, I am missing hundreds of files.

I was hoping this would be some kind of architecture-specific thing,
e.g. some extra step I did not take.

Has anyone had similar experiences or hints to the possible problem?

Thanks in advance, R.S.-