openpty() failed on disklabel with the installer

[Pierre-Philipp Braun <pbraun%nethence.com@localhost>]

Hi,

I am netbooting a sparcstation5 with NetBSD 6.1 for installation.  At
the disk initialization stage, I get,

     Status: openpty() failed
    Command: disklabel -w -r -f /tmp/disktab sd0 'CFP1080E SUN1.0'
     Hit enter to continue

I see this issue has been identified a while ago
(http://gnats.netbsd.org/37433).

Those features are enabled in the kernel I used -- a standard GENERIC on
top of the provided rootfs.tgz for the installation program,

options         COMPAT_BSDPTY   # /dev/[pt]ty?? ptys.
file-system     PTYFS           # /dev/pts/N support
pseudo-device   pty                     # pseudo-terminals

ref
http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/arch/sparc/conf/GENERIC?rev=1.242&content-type=text/x-cvsweb-markup&only_with_tag=MAIN

So I am proceeding with a command line installation.  (dd to erase the 
first blocks on rsd0, disklabel -i sd0 writing the default layout -- 
otherwise got some other troubles, newfs, mount sd0a, mount nfs, tar 
xzphfe sets, installboot, MAKEDEV, localtime, rc.conf, fstab).  However, 
it would have been nice to use the installer !

Pierre-Philipp