(In passing, a "Subject: Need Help" is almost completely uninformative.
Something like "installboot complaint", vague as it is, would be
significantly better.)

> I am installing Netbsd for sparc64 arch under solaris.

> #installboot bootblk /dev/dsk/c0t3d0s0
> /dev/dsk/c0t3d0s0: Not a character device

> I dont understand that why this error is generating.

Because /dev/dsk/c0t3d0s0 is _not_ a character device; it's a block
device.  You need to use the raw disk device.  I'm not a Solaris expert
by any means, but I _think_ this would be /dev/rdsk/c0t3d0s0.

As for its solution, well, if using the raw device doesn't fix it, I'll
have to leave it to someone who actually knows Solaris.

/~\ The ASCII				der Mouse
\ / Ribbon Campaign
 X  Against HTML	       mouse@rodents.montreal.qc.ca
/ \ Email!	     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B