[rescue] Replacement NVRAM/clock for IPX, success + question

Mike Loewen mloewen at cpumagic.scol.pa.us
Thu Sep 24 19:14:20 CDT 2015

2015-09-24 10:07 GMT+02:00 Peter Stokes <peter at ashlyn.co.uk>:

> Not sure if relevant, but from memory I thought the system serial number 
> on the case related to the hostid (and hence ethernet)  in some way on 
> these older systems?

    Have you looked at the sun-nvram-hostid FAQ?


    In the sun4 section:

"The NVRAM chip will usually have a white or yellow barcode label on it 
(except for sun4d). Given the barcode, Sun can reconstruct your original 
hostid and ethernet address. On newer machines (some SS5, SS20, all 
Ultras) the number printed on the barcode is the last three bytes of the 
ethernet address and also the last three bytes of the hostid. The first 
three bytes of the ethernet address are always 8:0:20 and the first byte 
of the hostid is determined by the system type (see table below), so on 
these machines you can trivially reconstruct the hostid. I have no idea 
how to do it on the machines with the old style barcode label, but if 
nothing else, the label makes the NVRAM chip easy to identify."

    Is that what you were thinking of?

Mike Loewen				mloewen at cpumagic.scol.pa.us
Old Technology				http://q7.neurotica.com/Oldtech/

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