[SunRescue] Bad - new NVRAM/TOD??

[Mike Hebel]

RE: Test NVRAM chip...

Done!  I'll volunteer for that!

Mike Hebel

-----Original Message-----
From: rescue-admin at sunhelp.org [mailto:rescue-admin at sunhelp.org]On
Behalf Of Harry Regan
Sent: Wednesday, January 03, 2001 7:17 AM
To: rescue at sunhelp.org
Subject: Re: [SunRescue] Bad - new NVRAM/TOD??


Hi Steve--

Yeah, I experienced the same thing and posted a message about it in
December.
Since then, I've found out two additional data points.  I originally ordered
200 NS chip for my IPX from Mouser and got the TOD error you reference.  I
ordered a 70 NS version of the same chip (also from Mouser) and got the same
results.

Then I ordered the 150 NS version of the M48T12 from JDR Microdevices (they
don't carry the M48T02), and it worked like a champ.  They're $16.99 each
from
JDR, rather than $12.80 from Mouser for the M48T02.  Mouser also carries the
M48T12 chip, also at $12.80, but I haven't tried it (yet).

So, despite what the NVRAM FAQ says, it looks like the MT48T12 chip is the
one
to use.  All the chips I've been playing with are from the same
manufacturer,
so it's not a vendor problem.

The ones that did NOT Work:

   Manufacturer: ST  Label: M48T02-70PC1
   Manufacturer: ST  Label: M48T02-200PC1

The one that DID Work:

   Manufacturer: ST  Label: M48T12-150PC1

I will sware that I successfully used an M48T02 on an IPC a while back.
Anyone out there have an IPC with a dead NVRAM chip willing to experiment
with
one of these chips?  I'll send a free chip to the first one who volunteers!

P.S.  I have not found a way around the TOD Clock error.  I even tried some
kinky nvramrc gymnastics, but the machine would always blow back to the prom
prompt.



--- original message ---

Hi all,

I recently pulled an old IPX and SS2 off the shelf and
fired them up. Of course, the ether address and
hostid
weren't there - so I replaced the NVRAM with a brand
new one from Mouser. Reset the hostid and ether
address.

Now at boot it complains that FAILURE TOD (f20007fa)
Bit failure, exp=000000ff,obs=0000007f. Can't op.
Power on Self Test Failed - Replace NVRAM.

However, the ether address and hostid remains after
removing power, and the clock keeps good time,
indicating the battery is ok.

I've pulled the sun-nvram-hostid.faq and reset - but
no avail.

Other than saying its failed and stopping the boot
process, the box is happy.

Any ideas on how to reset the bit it's looking for and
get a clean boot?

thanks!!


___________________________________________________________________
---- Harry J. Regan
---- Phone: 202.310.2719
---- FAX: 212.202.3923
---- harry.regan at usa.net
---- hregan at lepus.com


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