Date: Mon, 19 Feb 2001 13:35:39 -0800 (PST) From: Richard Hodges <rh@matriplex.com> To: Gerald Heinig <Gerald.Heinig@post.rwth-aachen.de> Cc: freebsd-atm@FreeBSD.ORG Subject: Re: ATM switch woes Message-ID: <Pine.BSF.4.10.10102191321480.7150-100000@mail.matriplex.com> In-Reply-To: <3A918D60.36D7A733@post.rwth-aachen.de>
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On Mon, 19 Feb 2001, Gerald Heinig wrote:
> Hi,
>
> I've got a major problem with my ATM switch: it's a Synoptics/Bay Networks
> LattisCell 10114 and I've flashed the flash ROM with the wrong data.
> It will now no longer download any firmware and is basically useless :-(
> I've got a similar switch (10114R-E3) from Nortel Networks Germany on
> loan and I wanted to read its flash ROM and write the contents into
> mine, since that's the only non-volatile part to have changed.
> However, I can't easily remove the ROM without damaging the switch
> (which isn't mine).
I am assuming Flash memory here... Is the Flash chip a DIP? If so,
you should be able to get a special ribbon cable to connect it to
your device programmer. With the unit powered off, you should be able
to reprogram the Flash with a new image.
A typical ribbon cable like this has an IDC connector with DIP pins
on one end, and a clamp-like connector on the chip side. I have
not seen one recently, but this is something you would use to connect
a logic analyzer to a chip on your circuit under test.
As a "last resort" method, you could get two 32-pin wire-wrap sockets
and some ribbon cable, and wire the pins between them. You would
have to be sure the pins made good contact with the Flash device.
Maybe a few rubber bands high on the wire-wrap socket would keep
enough tension on the leads.
I have never programmed devices over an extended ribbon cable, but
I don't think that would be a problem. Flash memories program
themselves and you just keep polling them until each byte is done.
Hope this helps!
-Richard
-------------------------------------------
Richard Hodges | Matriplex, inc.
<title> | 769 Basque Way
rh@matriplex.com | Carson City, NV 89706
775-886-6477 | www.matriplex.com
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