port-hp700/45742: sysinst should warn about PDC's 2GB limit for boot partition

[shattered%netbsd.org@localhost]

>Number:         45742
>Category:       port-hp700
>Synopsis:       sysinst should warn about PDC's 2GB limit for boot partition
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-hp700-maintainer
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 25 17:15:00 +0000 2011
>Originator:     Sergey Svishchev
>Release:        NetBSD 5.99.59
>Organization:
>Environment:
>Description:
Neither sysinst nor install notes mention that PDC (firmware) cannot boot
from a partition greater than 2GB in size.
        
>How-To-Repeat:
Install http://nyftp.netbsd.org/pub/NetBSD-daily/HEAD/201112220420Z/hp700/ on
a B180L.

In sysinst, use existing partitions on disk (manually partitioned beforehand).
The only warning is 

  installboot: WARNING: Partition `a' of `/dev/rsd0c' exceeds 2GB boundary.
  installboot: WARNING: It won't boot since hp700 PDC can handle only 2GB.

Installation completes without error, but boot fails:

  NetBSD/hp700 FFS/LFS Primary Bootstrap

  32bit firmware

  booting from partition a
  boot partition exceeds 2GB boundary
  boot partition (a-p, ! to reboot) [a]:

        
>Fix:
        

>Unformatted: