[SunRescue] IRIX and SGI -- OT --URGENT!-

[Mark Davies]

Sorry 'old bean'

This was recomended to me via an SGI dealer. I have carried out the proc'
many times.
BUT, I do have to slightly back down, by saying, not tried on an INDIGO 2.
But if the chip is the same, then with care it will work.


----- Original Message -----
From: Corda Albert J DLVA <CordaAJ at NSWC.NAVY.MIL>
To: <rescue at sunhelp.org>
Sent: Thursday, February 15, 2001 7:54 PM
Subject: RE: [SunRescue] IRIX and SGI -- OT --URGENT!-


>
> Woah!  Hold on there!
>
> Insert the chip BACK-TO-FRONT?!!!
>
> I would _Definitely_ not recommend this!  If you look at the
> specs for the DS1286 chip, I think you'll find that this
> applies reverse voltage to the chip (i.e. +5v applied to the
> GND pin and GND applied to the +5v pin). Such an attempt might
> very likely let the magic smoke out of the chip (and possibly
> the Indigo2 motherboard as well)  BTW, the specs for
> the chip can be found at:
> http://www.dalsemi.com/products/timekeep/watchdog.html
>
> What you would really want to do is to somehow disable the
> CE (Chip Enable) pin of the chip when the Indigo2 is booting,
> so that it thinks it has an invalid NVRAM setup.  After the
> prom boot is completed and you are in the prom monitor, you
> want to re-enable the CE pin connection, so that the prom monitor
> can then write to the chip, which will allow you to reset
> the prom password.  I can think of two ways to do this... the
> first (more risky) way is to pull the DS1286 (with the power off),
> power-up the machine, get into the prom monitor (past the point
> where it checks for a prom password), then (VERY CAREFULLY!)
> re-insert the DS1286 and reset the prom password. The second
> way would be to rig up a double 28-pin socket (i.e. one socket
> on top of another, best done with machine-pin sockets) with pin
> 20 cut between the sockets, and wire the upper and lower pin
> 20 stubs to a small switch between the pins, probably with some
> fine wirewrap wire. Plug the socket assembly into the
> motherboard, and the DS1286 into the top socket. Use the switch
> to disable/enable the chip.  This would require some delicate
> soldering, etc. but in my opinion it's the safest way.
>
> BTW, all this is moot if there isn't a hardware (prom) password.
> Also, I seem to remember that there is an "official" way to
> reset the hardware prom password on the Indigo2 via use of a
> jumper or something of that nature... Unfortunately, I don't
> actually remember the procedure. Does anyone else out there
> remember it?...
>
> -al-
> -acorda at geocities.com
>
>
>
> > -----Original Message-----
> > From: Mark Davies [mailto:mark.uunix at btinternet.com]
> > Sent: Thursday, February 15, 2001 10:05 AM
> > To: rescue at sunhelp.org
> > Subject: Re: [SunRescue] IRIX and SGI -- OT
> >
> >
> >
> > Hi.
> >
> > > -----Original Message-----
> > > From: rescue-admin at sunhelp.org
> > > [mailto:rescue-admin at sunhelp.org]On
> > > Behalf Of Simeon Johnston
> > > Sent: Wednesday, February 14, 2001 2:49 PM
> > > To: sun-rescue
> > > Subject: [SunRescue] IRIX and SGI -- OT
> > >
> > >
> > > Sorry if this is not related to sun systems but I need help...
> > > I got an SGI Indigo2 at an auction and am trying to load a
> > > system on
> > > it.  I have IRIX 6.5 disks and have everything I need
> >
> > A proper bootable CDROM drive? (I assume yes)
> >
> > > but there
> > > is a
> > > password on the machine.
> > > It doesn't allow me to log into the machine as anything other
> > > than the
> > > admin or guest.
> >
> > "admin" ??
> >
> > Can U stop the system on startup (press 'esc') ?
> > clcik on command line (bottom button??)
> > If you can get this far, and no passwd is required, then I
> > would suggest
> > just re-initalizing and mkfs the disk:
> > If you need help with this, just let me know the SCSI id of
> > the CDROM drive.
> >
> > if you cannot get to the miniroot then open up the box and
> > power off plug
> > in:
> >
> > pull out the dallas chip.
> > turn it back to front
> > power on
> > temp' insert the chip (back to front) for a few seconds
> > remove and turn everything off.
> > reinsert the chip
> > on the back of the computer is a ethernet address something
> > like 69:09:xx:xx
> > start the computer and stop it.
> > Go to command line:
> > type:
> >
> > setenv nvram -f 69:09:[whatever the remaining numbers are]
> >
> > reset the machine.
> >
> > All this is OK on INDY, INDIGO and anything else I've tried,
> > BUT never tried
> > it on a INDIGO 2
> >
> > hope this help
> >
> >
> > > I need to have full priveleges as I have
> > > already sold
> > > this machine.
> > > I can get to the system embedded into the hardware and get to
> > > the
> > > diagnostic tools but am unable to load a new system or bypass
> > > the login
> > > to get access.
> > >
> > > Is there a way to bypass the password or re-install the system
> > > from
> > > scratch?  It only allows me to update or fix the system, not
> > > re-install
> > > it.
> > >
> > > Any help would be appreciated.
> > >
> > > sim
> > >
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