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BUS PIRATE

From flashrom



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Bus Pirate v3, front Bus Pirate v3, back Recovering a bricked SPI based device
using a Bus Pirate

The Bus Pirate is an open source design for a multi-purpose chip-level serial
protocol transceiver and debugger. Flashrom supports the Bus Pirate for SPI
programming. It also has SPI sniffing functionality, which may come in useful
for analysing chip or programmer behaviour.

They are available for around US$30 from various sources.


CONTENTS

 * 1 Connections
 * 2 Usage
 * 3 Troubleshooting
 * 4 Speedup


CONNECTIONS

The table below shows how a typical SPI flash chip (sitting in the center of the
table) needs to be connected (NB: not all flash chips feature all of the pins
below, but in general you should always connect all input pins of ICs to some
defined potential (usually GND or VCC), ideally with a pull-up/down resistor in
between). Most SPI flash chips require a 3.3V supply voltage, but there exist
some models that use e.g. 1.8V. Make sure the device in question is compatible
before connecting any wires. NB: Some rather rare SPI flash chips (e.g. Atmel
AT45DB series) have a completely different layout, please beware.

Description Bus Pirate Dir. Flash chip Dir. Bus Pirate Description (not) Chip
Select CS → 1 /CS VCC 8 ← +3.3v Supply Master In, Slave Out MISO ← 2 DO (IO1)
/HOLD (IO3) 7 ← +3.3v (not) hold (see datasheets) (not) Write Protect +3.3v → 3
/WP (IO2) CLK 6 ← CLK The SPI clock Ground GND → 4 GND DI (IO0) 5 ← MOSI Master
Out, Slave In


USAGE

$ flashrom -p buspirate_spi:dev=/dev/device,spispeed=frequency 


Example:

$ flashrom -p buspirate_spi:dev=/dev/ttyUSB0,spispeed=1M



TROUBLESHOOTING

In case of problems probing the chip with flashrom - especially when connecting
chips still soldered in a system - please take a look at this page. In circuit
programming it often possible, so long as no other devices on the SPI bus are
trying to access the device.


SPEEDUP

A beta firmware build exists, to speed up the buspirate. See this post on
dangerousprototypes.com:
http://dangerousprototypes.com/forum/viewtopic.php?f=40&t=3864&start=15#p41505

http://dangerousprototypes.com/docs/Bus_Pirate#Firmware_upgrades

Retrieved from "https://wiki.flashrom.org/index.php?title=Bus_Pirate&oldid=1811"



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