openfirmware hardware reset ?

Hi,

I've got several UMAX Apus 2000 (C500) and while playing
with 
openfirmware (2.0) on one of them, I did something very
wrong,
	setenv little-endian? true

Now, when powering on the machine, I still got the bell,
but,
	- nothing appears on screen nor serial console
	- cmd-alt-p-r doesn't work
	- cmd-alt-n-v doesn't help
	- neither does the little reset button on motherbord, which
needs to be 
pressed while machine is on and makes it reboot
	- neither getting motherboard's battery disconnected 20
minutes

Any idea on how to get my openfirmware fixed ?

thanks

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Hello,

On May 17, 2007, at 15:31, pierre-philipp braun wrote:

> I've got several UMAX Apus 2000 (C500) and while
playing with 
> openfirmware (2.0) on one of them, I did something very
wrong,
> 	setenv little-endian? true
>
> Now, when powering on the machine, I still got the
bell, but,
> 	- nothing appears on screen nor serial console
> 	- cmd-alt-p-r doesn't work
> 	- cmd-alt-n-v doesn't help
> 	- neither does the little reset button on motherbord,
which needs to 
> be pressed while machine is on and makes it reboot
> 	- neither getting motherboard's battery disconnected
20 minutes
>
> Any idea on how to get my openfirmware fixed ?

Take the battery out again, pull the power plug, short
circuit the 
battery socket's contacts to drain any capacitors that may
still be 
holding some charge, then wait a little longer than 20
minutes. My S900 
took a couple hours to lose its nvram contents so letting it
sit like 
that over night should very likely do the trick.

have fun
Michael
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pbraunnethence.com wrote:

> 	- neither getting motherboard's battery disconnected
20 minutes

I had to unplug the battery _and_ AC power cable
more than a whole day when I set a wrong real-base
value on my Apus.
---
Izumi Tsutsui

On Thu, May 17, 2007 at 03:39:57PM -0400, Michael Lorenz
wrote:
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> 
> Hello,
> 
> On May 17, 2007, at 15:31, pierre-philipp braun wrote:
> 
> >I've got several UMAX Apus 2000 (C500) and while
playing with 
> >openfirmware (2.0) on one of them, I did something
very wrong,
> >	setenv little-endian? true
> >
> >Now, when powering on the machine, I still got the
bell, but,
> >	- nothing appears on screen nor serial console
> >	- cmd-alt-p-r doesn't work
> >	- cmd-alt-n-v doesn't help
> >	- neither does the little reset button on
motherbord, which needs to 
> >be pressed while machine is on and makes it reboot
> >	- neither getting motherboard's battery
disconnected 20 minutes
> >
> >Any idea on how to get my openfirmware fixed ?
> 
> Take the battery out again, pull the power plug, short
circuit the 
> battery socket's contacts to drain any capacitors that
may still be 
> holding some charge, then wait a little longer than 20
minutes. My S900 
> took a couple hours to lose its nvram contents so
letting it sit like 
> that over night should very likely do the trick.

Yeah, my experience from the two times I REALLY REALLY hozed
my G3 is that 
it takes over ten minutes to drain everything. So half an
hour is good, 
and a few hours wouldn't hurt.

Take care,

Bill

yes, it worked,

thanks
pierre-philipp

Michael Lorenz wrote:
> Take the battery out again, pull the power plug, short
circuit the 
> battery socket's contacts to drain any capacitors that
may still be 
> holding some charge, then wait a little longer than 20
minutes. My S900 
> took a couple hours to lose its nvram contents so
letting it sit like 
> that over night should very likely do the trick.