Created Pyboard Firmware Update (markdown)

Pyboard-Firmware-Update.md

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+## Download
+
+You can download the latest firmware from http://micropython.org/download/.
+
+## Preparation
+
+First, disconnect everything from your pyboard. Then connect the DFU pin with the 3.3V pin (they're right next to each other) to put the board into DFU (*Device Firmware Update*) mode. Now connect the pyboard to your computer via USB.
+
+## Flashing
+
+# dfu-util
+
+First, install dfu-util via your package manager.
+
+You can list all DFU-capable devices using the `-l` argument:
+
+```
+$ sudo dfu-util -l
+dfu-util 0.5
+
+(C) 2005-2008 by Weston Schmidt, Harald Welte and OpenMoko Inc.
+(C) 2010-2011 Tormod Volden (DfuSe support)
+This program is Free Software and has ABSOLUTELY NO WARRANTY
+
+dfu-util does currently only support DFU version 1.0
+
+Found DFU: [0483:df11] devnum=0, cfg=1, intf=0, alt=0, name="@Internal Flash  /0x08000000/04*016Kg,01*064Kg,07*128Kg"
+Found DFU: [0483:df11] devnum=0, cfg=1, intf=0, alt=1, name="@Option Bytes  /0x1FFFC000/01*016 e"
+Found DFU: [0483:df11] devnum=0, cfg=1, intf=0, alt=2, name="@OTP Memory /0x1FFF7800/01*512 e,01*016 e"
+Found DFU: [0483:df11] devnum=0, cfg=1, intf=0, alt=3, name="@Device Feature/0xFFFF0000/01*004 e"
+```
+
+First, backup the original firmware:
+
+```
+$ sudo dfu-util --alt 0 -U pyboard-original.dfu
+dfu-util 0.5
+
+(C) 2005-2008 by Weston Schmidt, Harald Welte and OpenMoko Inc.
+(C) 2010-2011 Tormod Volden (DfuSe support)
+This program is Free Software and has ABSOLUTELY NO WARRANTY
+
+dfu-util does currently only support DFU version 1.0
+
+Opening DFU USB device... ID 0483:df11
+Run-time device DFU version 011a
+Found DFU: [0483:df11] devnum=0, cfg=1, intf=0, alt=0, name="@Internal Flash  /0x08000000/04*016Kg,01*064Kg,07*128Kg"
+Claiming USB DFU Interface...
+Setting Alternate Setting #0 ...
+Determining device status: state = dfuERROR, status = 10
+dfuERROR, clearing status
+Determining device status: state = dfuIDLE, status = 0
+dfuIDLE, continuing
+DFU mode device DFU version 011a
+Device returned transfer size 2048
+Limiting default upload to 16384 bytes
+bytes_per_hash=2048
+Starting upload: [#######] finished!
+```
+
+Then write the downloaded firmware to the pyboard:
+
+```
+$ sudo dfu-util --alt 0 -D pybv10-2014-05-19-v1.0.1-24-g5cdff5f.dfu 
+dfu-util 0.5
+
+(C) 2005-2008 by Weston Schmidt, Harald Welte and OpenMoko Inc.
+(C) 2010-2011 Tormod Volden (DfuSe support)
+This program is Free Software and has ABSOLUTELY NO WARRANTY
+
+dfu-util does currently only support DFU version 1.0
+
+Opening DFU USB device... ID 0483:df11
+Run-time device DFU version 011a
+Found DFU: [0483:df11] devnum=0, cfg=1, intf=0, alt=0, name="@Internal Flash  /0x08000000/04*016Kg,01*064Kg,07*128Kg"
+Claiming USB DFU Interface...
+Setting Alternate Setting #0 ...
+Determining device status: state = dfuUPLOAD-IDLE, status = 0
+aborting previous incomplete transfer
+Determining device status: state = dfuIDLE, status = 0
+dfuIDLE, continuing
+DFU mode device DFU version 011a
+Device returned transfer size 2048
+Dfu suffix version 11a
+DfuSe interface name: "Internal Flash  "
+file contains 1 DFU images
+parsing DFU image 1
+image for alternate setting 0, (2 elements, total size = 245928)
+parsing element 1, address = 0x08000000, size = 392
+parsing element 2, address = 0x08020000, size = 245520
+done parsing DfuSe file
+```
+
+# dfu-programmer
+
+Some other DFU programmer. TODO: Document.
+
+# On Windows
+
+TODO: Document