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Restoring NVRAM on Sparc5

Posted on 2002-07-05
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Last Modified: 2013-12-27
I have a Sparc5 that I wanted to make into a "headless" platform,
i.e., no keyboard, no monitor.

I set the NVRAM variables input-device to ttya, and
output-device also to ttya.

The box would not boot up after that.  Stop-N likewise will not
reset NVRAM.  

If I connect a terminal to Serial port A, I do get some output, but the
machine never enters the boot process, nor am I able to enter any
input via the terminal.

Is there some other way to get the keyboard and monitor set back up
as the default input and output devices?
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Question by:billwcc
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Expert Comment

by:jlevie
ID: 7133133
Have you tried connecting monitor and keyboard to the box, leaving nothing connected to ttya? I think I fixed one in a similar state that way once.
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Author Comment

by:billwcc
ID: 7133823
Yes, tried that with both Stop-N and Stop-A.

I'm hoping for maybe a magic jumper on the motherboard or something like
that.  There must be a way to reproduce the Stop-N signal by tweaking the
right wires, somehow.  Thanks for your help, tho.
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Accepted Solution

by:
jlevie earned 200 total points
ID: 7133922
A 'Break' from a tty console is the equivalent of a Stop-A from a Sun keyboard. Most real terminals have a Break key and  a number of terminal emulators can generate one by some key combination or possibly a menu item. That would get you to the Prom prompt.
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Author Comment

by:billwcc
ID: 7139283
Hey,

It worked.  Thanks a million.
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Author Comment

by:billwcc
ID: 7139285
Hey,

It worked.  Thanks a million.
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