Discussion:
The Dreaded Indigo NVRAM password
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lenores_dirge
2011-02-11 03:20:05 UTC
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Well, I finally decided to get an old Indigo I had up and running, and
it has an NV ram password. As it does not have a bootable version of
IRIX, I went looking for how to reset this thing. the best
explanation I found is this:

remove CPU module. locate socketed EEPROM on back plane.
tape EEPROM on the end of a very long stick (you'll need the length
later) reinstall CPU module. power up Indigo enter passworded menu
option. reinstall EEPROM (yeah, with the long stick) with machine
still on. Enter reset password command (forget the name). Enjoy!
Works almost everytime. oh yeah, take the stick off.

Not really wanting to potentially fry this system, I was wondering if
it would be possible to pull the chip, Install IRIX, shut down,
reinstall it, and then reset the password in a much more sane
fashion. Any ideas?
Steven Hirsch
2011-02-11 21:33:37 UTC
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Post by lenores_dirge
Well, I finally decided to get an old Indigo I had up and running, and
it has an NV ram password. As it does not have a bootable version of
IRIX, I went looking for how to reset this thing. the best
remove CPU module. locate socketed EEPROM on back plane.
tape EEPROM on the end of a very long stick (you'll need the length
later) reinstall CPU module. power up Indigo enter passworded menu
option. reinstall EEPROM (yeah, with the long stick) with machine
still on. Enter reset password command (forget the name). Enjoy!
Works almost everytime. oh yeah, take the stick off.
Not really wanting to potentially fry this system
I think you have that one right... Your chances of being able to get a 28+
pin EPROM into a socket on the end of a stick are not real good.

A safer (but more complex) way to do it would be to put the EEPROM into a
"piggyback" socket arrangement with CE* brought out to a switch. Start with
the CE* line open, bring it up to the menu, then flip the switch and reset the
password. Unless I'm misunderstanding the system architecture, a disabled
chip should look like it's not there at all.

Steve

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