[rescue] Bypassing Password Protected NVRAM on SS4

Jeff Borisch rescue at sunhelp.org
Fri Dec 7 11:37:52 CST 2001


I've done the same and haven't roached anything yet either. (-:

However here is a tip from James (Sharp|Birdsall)? about a better way to do
it. I've tried this too and it works great.

best regards,
jeffrey

[Start Tip]
> The way you have listed (hot plugging the NVRAM) does indeed work, but it
is
> unnecessarily risky.  It's possible to reset it with no hot plugging and no
> risk for the cost of a 24 pin socket (a ZIF socket if you really want to
make
> it easy).
>  
> Take the socket and clip off one of the address or data lines.  Pin 1 is A7
> and that works fine.
>  
> Remove NVRAM from motherboard.  Plug the socket into the motherboard and
the
> NVRAM chip into the socket.
>  
> Power the system on.  You will get an NVRAM checksum error.  At the ok
prompt,
> type anything that induces an NVRAM write (set-defaults works).
>  
> Power the system off.  Unplug the NVRAM and socket, then plug the NVRAM
back
> into the motherboard.  Power on and you will get another checksum error. 
You
> can now program the NVRAM to your hearts content.
>  
> It sounds more complicated, but it's really quite fast and easy as you
don't
> have to worry about killing any hardware while the power is on.
>  
> -James
[end]



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