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| {{DISPLAYTITLE:serprog}} | | {{#externalredirect: https://www.flashrom.org/supported_hw/supported_prog/serprog/overview.html}} |
| This page is a first draft only and serves to collect information about the serprog protocol and the programmers implementing it.
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| = Protocol =
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| See [http://flashrom.org/trac/flashrom/browser/trunk/Documentation/serprog-protocol.txt serprog-protocol.txt] in the source tree. It is designed to be compact and allow efficient storage in limited memory of programmer devices.
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| = Hardware =
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| == AVR flasher by Urja Rannikko ==
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| [[File:Avr rs232 programmer.jpg|thumb|right|Prototype RS232 AVR parallel flash programmer]]
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| The [http://www.randomprojects.org/wiki/Prototype_RS232_AVR_parallel_flash_programmer Prototype RS232 AVR parallel flash programmer] Urja Rannikko was the first implementation of the serprog protocol.
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| FIXME: AVR source code is somewhere in the coreboot mailing list archives...
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| == AVR flasher by eightdot ==
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| FIXME: Link?
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| == Arduino Mega flasher by fritz ==
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| [http://www.flashrom.org/pipermail/flashrom/2010-May/003250.html]
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| [http://www.coldelectrons.com/blog/?page_id=165]
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| [http://www.coldelectrons.com/blog/wp-content/uploads/2010/05/flashprg.txt]
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| FIXME: More info?
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| == InSystemFlasher by Juhana Helovuo ==
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| This is one talks to SPI devices via serial over USB. Details can be found in the [http://www.coreboot.org/InSystemFlasher coreboot wiki] and in this [http://www.coreboot.org/pipermail/coreboot/2011-February/063349.html coreboot mailing list thread].
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| == atmegaXXu2-flasher by Stefan Tauner ==
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| Like the InSystemFlasher this one uses LUFA on an AVR microcontroller to tunnel the serial data over USB.
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| [[File:atmegaXXu2-flasher.jpg|200px|thumb|right|atmegaXXu2-flasher with Pomona SOIC hook attached]]
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| == Arduino flasher by GNUtoo ==
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| '''WARNING, the SPI levels are at 5V, while I tried it with 3.3V chip and that it worked(but DIO was at 4.3v which was over the maximum of 4v, during all the time that the chip was connected to the programmer), it may not work for you and break the chip...'''
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| This flasher require the following hardware parts:
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| * An arduino uno or an arduino Duemilanove(way faster) and its usb cable
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| * some wires(optionally some connectors to solder on(for easier plugin and more reliability)
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| * <s>a 10k resistor</s>
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| * A flash chip with the following characteristics:
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| ** supported by flashrom
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| ** SPI
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| ** 3.3v or 5v(the arduino has a 3.3v and a 5v output, only 3.3v was tested...)
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| === Pictures ===
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| <gallery caption="Pictures " widths="250px" heights="250px" perrow="4">
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| File:Serprog_0001.jpeg
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| File:Serprog_0002.jpeg
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| File:Serprog_0003.jpeg
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| File:Serprog_0004.jpeg
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| File:Serprog_0005.jpeg
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| File:Serprog_0006.jpeg
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| File:Serduino_laptop.jpeg| Because of the long cables flashrom had to retry once before reflashing the BIOS but at the end it worked. So don't use cables that are that long...
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| File:W1qtO.jpg| Setup by Sebastian Parborg (DarkDefender)
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| File:Arduino_topview_noresistor.jpeg| It now seem to also work without resistor...
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| </gallery>
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| === Building ===
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| Left pins of the BIOS chip:
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| --------------------------------------------------------
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| [pin1 of the bios chip] /CS<->10k resistor<->VCC
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|
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| [pin1 of the bios chip] /CS<->Arduino pin10(SS, PORTB2)
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| [pin2 of the bios chip] DO<->Arduino pin12(MISO, PORTB4)
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| [pin3 of the bios chip] /WP<->VCC
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| [pin4 of the bios chip] GND<->GND on the power pins
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|
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| Right pins of the BIOS chip:
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| --------------------------------------------------------
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| [pin8 of the bios chip] VCC<->+3.3V on the power pins of the Arduino
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| [pin7 of the bios chip] /HOLD<->VCC
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| [pin6 of the bios chip] CLK<->Arduino pin13(SCK, PORTB5)
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| [pin5 of the bios chip] DIO<->Arduino pin11(MOSI, PORTB3)
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| The Bios chip used is a W25X80.
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| The Arduino is an arduino uno.
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| === Software ===
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| ==== Settings ====
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| {| class="wikitable" border="1"
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| !git branch
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| !Compatible Arduino version
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| !flashrom arguments
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| !Comments
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| |-
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| | master
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| * Arduino uno
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| | -p serprog:dev=/dev/ttyACM0:2000000
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| * reliability issues (flashrom blocks waiting for data from the arduino indefinitely) with the code that is in the 8u2/16u2 beeing investigated...
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| |-
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| | ftdi
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| * Arduino Duemilanove
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| * Arduino uno with an external FTDI serial<->usb adapter or any other kind of adapter capable of 2000000 bps
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| | -p serprog:dev=/dev/ttyUSB0:2000000
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| * Works flawlessly
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| * Very fast
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| |-
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| |}
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| ==== Performances ====
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| # time flashrom -p serprog:dev=/dev/ttyACM0:2000000 -r coreboot.rom
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| flashrom v0.9.5.2-r1541 on Linux 2.6.38-14-generic (x86_64)
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| flashrom is free software, get the source code at http://www.flashrom.org
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| Calibrating delay loop... OK.
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| serprog: Programmer name is "serprog-duino"
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| Found Winbond flash chip "W25X80" (1024 kB, SPI) on serprog.
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| Reading flash... done.
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| real 0m16.602s
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| user 0m0.930s
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| sys 0m0.000s
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| # time flashrom -p serprog:dev=/dev/ttyACM0:2000000 -w build/coreboot.rom
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| flashrom v0.9.5.2-r1541 on Linux 2.6.38-14-generic (x86_64)
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| flashrom is free software, get the source code at http://www.flashrom.org
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| Calibrating delay loop... OK.
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| serprog: Programmer name is "serprog-duino"
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| Found Winbond flash chip "W25X80" (1024 kB, SPI) on serprog.
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| Reading old flash chip contents... done.
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| Erasing and writing flash chip... Erase/write done.
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| Verifying flash... VERIFIED.
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|
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| real 0m39.548s
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| user 0m2.650s
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| sys 0m0.000s
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| ==== Required software ====
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| To make it work you need:
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| * flashrom from svn
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| * [https://gitorious.org/gnutoo-personal-arduino-projects/serprog-duino serprog-duino which runs on the arduino]
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| * The avr toolchain(avr-gcc, avr-libc,make etc...)
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| ==== Building the software ====
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| $ svn co svn://flashrom.org/flashrom/trunk flashrom
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| $ cd flashrom && make
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| $ cd ../
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| $ git clone git://gitorious.org/gnutoo-personal-arduino-projects/serprog-duino.git
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| $ cd serprog-duino && make && make upload
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| ==== Running flashrom ====
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| ./flashrom -p serprog:dev=/dev/ttyACM0:2000000
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| === Advantages and disadvantages ===
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| * <s>The speed isn't that great(about 3 minutes for reading+writing+verifying a 1M chip)</s>
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| * The speed is now much better thanks to a patch by Sebastian Parborg.
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| * it is made of very commonly available parts(if you can find an arduino uno, you will be able to build it).
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| * Voltage issues( SPI levels are at 5v, it's problematic for flashing 3.3v chips...)
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| === TODO ===
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| * Find a way to lower the voltage to 3.3v
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