On running hpost on a newly created domain, it fails as follows :-

% hpost -l127
Opening SNMP server library...
 
Significant contents of /export/home/ssp/.postrc:
#
logfile
 
Reading centerplane asics to obtain bus configuration...
Failure to determine current centerplane bus configuration.
Dumping centerplane state to file...
System state (mask=30000) dumped to:
        /var/opt/SUNWssp/adm/testdm/xfstate.0310.1100.47
Exitcode = 79: Not -C, couldn't determine current bus config
POST (level=127, verbose=20) execution time 2:09

The solution is to run the hpost command with the -C option.
The reason for the failure is that the centerplane of the
E10K has never been configured. If a bringup was run instead 
of hpost, this would automatically configure the backplane for you.

From the man page of hpost :

     -C        Do the initial configuration of  the  centerplane.
               If  -C  is not invoked, hpost  assumes that one or
               more other domains in the same  physical  platform
               have  already  been  configured  and  are running.
               hpost  probes the centerplane to determine the bus
               configuration,  the  only configuration it consid-
               ers. If hpost  cannot determine  a  valid   confi-
               guration from this probe, it immediately fails.


Therefore the command :

	% hpost -l127 -C

Should work fine. After the first hpost with a -C, you can run hpost
against any subsequent domains which are built.

CAUTION : Running hpost -C on a platform which has running domains
will cause these domains to fail/panic/arbstop. hpost -C should 
never be run on a platform which already has running domains.