Not the most elegant way of doing it, but since ISP programming failed and
it had bricked the motherboard I pulled (de-soldered) the flash chip off the
board and used buspirate to flash it. Off the board flashing with buspirate
worked on the same chip that it would not while installed on the board.
Soldered the flash chip back on the board and it is now un-bricked.
So, on some of the boards (all identical) ISP worked but on this particular
one it would not. Surely it is all impedance/signal bandpass filtering
related just like explained in your http://flashrom.org/ISP. One
recommendation would be that when attempting ISP to first read the flash
several times (or even run flashrom/buspirate with no arguments) to make
sure flashrom/buspirate is consistently working finding and then reading the
chip before attempting to write to it.
Thanks for all the help.
-----Original Message-----
From: Stefan Tauner
Sent: Monday, May 12, 2014 3:31 PM
To: Roberto Denis
Cc: [email protected]
Subject: Re: [flashrom] Buspirate Erratic Results : WInbond W25Q128.V
On Mon, 12 May 2014 13:40:42 -0700
Roberto Denis <[email protected]> wrote:
I have three workstations with the same motherboards, all identical (same
revision, chips, etc.). Motherboards have a Winbond W25Q128 flash chip.
I have flashed two of those successfully several times with Buspirate
(internal programmer is a no-go on these boards).
On the third motherboard flashrom fails to identify the flash chip 8 out
of 10 times and terminates. Then on the few occasions when it does
identify the flash chip it fails to complete the flashing process
successfully (errors erasing).
I have tried two different Buspirate flashed with firmware 5.1, 6.0, 6.1,
and 6.2 (same results regardless of firmware). All the hardware
connections are fine - I have checked continuity from the flash chip legs
to the Pomona clip to Buspirate. My wire leads from Buspirate to the
Pomona clip are short, 10 cm. I am certain this is not a hardware issue
since Buspirate/flashrom work on two other motherboards.
I just do not know what other test should be pursued to get to a
resolution. I have attached the –V logs for a successful flash from one
of the two boards flashrom works, log where flash chip found but aborts
on errors, log where flash chip not found, and a –VVV log for the latter.
I note that the ‘probing’ results are very different but do not know what
that may lead to conclude.
Any pointers, comments, help welcome.
Intel-based boards? The following page was not written with external
programmers in mind, but it is probably the underlying cause...
http://flashrom.org/ME
see also the last point in the problems section here:
http://flashrom.org/ISP
--
Kind regards/Mit freundlichen Grüßen, Stefan Tauner
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