check your 2.6 CD and make sure the part no. is
704-6657-11 above if your cpu is 419+Mhz.
Hope this Help
Here is the Doc. from SUN, if you have account
on sunsolve.sun.com, you can search doc. ID 20576
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SRDB ID Date 10 April 2000
20576
Installing Solaris 2.5.1 11/97 or Solaris 2.6 HW 5/98 on selected hardware fails with hme0:link down or keyboard input repeats.
10 Apr 2001
Problem Description
Installing Solaris 2.5.1 11/97 or Solaris 2.6 5/98 on Ultra 5, 10, 60, 80 or E220r and E420r
with 440 or 450 Mhz CPUs, whether interactively using a CDROM or doing a
jumpstart install will fail with the message "hme0 - link down".
Another failure symptom is multiple keyboard input repeats, or repeating keystrokes
.
To prevent this, the Operating Environment Installation CD p/n 704-6914-10 (Sept 99) or
704-7076-10 (Feb 2000) must be used. Complete procedures are documented in
the manual(s) 804-6657-11(Sept 99) or 806-4005-10 (Feb 2000)
"Installing Solaris 2.5.1 or Solaris 2.6 Software on 419+ MHz Systems" or
"Installing Solaris Software for Selected Hardware"
Look for the OECD and documentation in the shrink wrapped packet
that says "Binary Code License" or inside front cover of
"Installing Solaris Software for Selected Hardware" manual.