[flashrom] Fwd: BPv3.6 w flashrom

[Idwer Vollering]

Forwarding. Please "reply to all".

---------- Forwarded message ----------
From: Nabs 
Date: 2012/12/5
Subject: Re: [flashrom] BPv3.6 w flashrom
To: "[e-mail]"

Just had a Eureka moment.
I think what confused me was the fact that the cables were soldered onto
the actual soic clip!
So all I need to do is desolder and resolder them into their correct
layouts, or desolder and use alligator clips instead?
Is that right? Cheers, Nabs.

------------------------------
* From: * Idwer Vollering ;
* To: * Nabs ;
* Cc: * [e-mail] ;
* Subject: * Re: [flashrom] BPv3.6 w flashrom
* Sent: * Wed, Dec 5, 2012 12:05:04 PM

2012/12/5 Nabs :
> Hi, sorry for the trouble. I'm running bus piratev3.6, bootloaderv4.4,
> firmwarev6.1 on flashrom-0.9.6.1, i plan to run the BP at 1M.
>
> When i run the command "flashrom -p buspirate_spi:dev=/dev/ttyUSB0 -Vr
> oldbios.bin"
> I get:
> "
> Found Generic flash chip "unknown SPI chip (RDID)" (0 kB, SPI) on
> buspirate_spi.
> Probing for Generic unknown SPI chip (REMS), 0 kB: probe_spi_rems: id1

0x0,
> id2 0x0
> Found Generic flash chip "unknown SPI chip (RDID)" (0 kB, SPI).
> ===
> This flash part has status NOT WORKING for operations: PROBE READ ERASE
> WRITE
> " etc...
>
> I think i have the wiring wrong which is why i get that error, i wonder if
> you could help me as its my first time?
> I'm trying to use In-circuit programming with a soldered bios chip using

an
> 'SOIC 8 clip' and it has 8 wires. But the bus pirate has 10 pins.
>
> From another thread, these are the connections i need:
> Bus Pirate "MISO" (Pin 1) <----- SPI Device "DO" (Wire/Pin 2)
> Bus Pirate "CS" (Pin 2) -----> SPI Device "CS" (Wire/Pin 1)
> Bus Pirate "MOSI" (Pin 3) -----> SPI Device "DI" (Wire/Pin 5)
> Bus Pirate "CLK" (Pin 4) -----> SPI Device "CLK" (Wire/Pin 6)
> Bus Pirate "GND" (Pin 10) <----> SPI Device "GND" (Wire/Pin 4)
>
> It appears to me that GND is pin 10 and that the wires of the SOIC8 clip
> only contact pins 1-8, so how can this work?
>
> Also, could i just check the layout of the pins on the bus pirate if i'm
> reading it correctly on BPv3.6:
> 10  9
> 8    7
> 6    5
> 4    3
> 2    1
>
> Corresponding to:
> GND  3V3
> +5V    ADC
> VPU  AUX
> CLK    MOSI
> CS    MISO

Forget the existence of +5V, VPU, ADC and AUX for now (
http://dangerousprototypes.com/docs/Bus_Pirate_I/O_Pin_Descriptions ),
connect the clip to the buspirate so that the clip passes the
buspirate pins like mentioned in this post:
http://www.coreboot.org/pipermail/flashrom/2012-November/010178.html

This works for me, with a MX25L1605A soic8 chip:

CS# (CS)                                          [1  chip  8]    VCC
(bridge with buspirate pin 3+7)
SO (MISO)                                        [2  chip  7]    HOLD#
(+3V3)
WP# (bridge with buspirate pin 7+8)    [3  chip  6]    SCLK (CLK)
GND (GND)                                      [4  chip  5]    SI (MOSI)
> Or are the pin numbers read in the opposite direction?
> ie
> 9  10
> 7  8
> 5  6
> 3  4
> 1  2
>
> Here's an image of my bus pirate if it helps:

http://dangerousprototypes.com/wp-content/media/2012/11/Bus-Pirate-v3.6inter...
> Your help is much appreciated and i appreciate your patience, Nabs.
>
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