Please see
http://www.sfcompiler.co.uk/forum/viewtopic.php?p=8293
DS30 Compatible Loader
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I think it depends on your definition of small, and how you want to interface to it.I would LOVE to find some nice, small, easy to use bootloader code
For a serial port loader, DS30 is pretty reasonable.
Most of the USB ones I've seen are much bigger. The MikroE StartUSB is about 6700 bytes, and the Microchip HID loader is about 4K. There are some smaller open-source ones out there like Diolan which only take 2K.
There's a Swordfish version of the Microchip HID loader in the USB v1.4 stack sources I posted, but it's pretty much the same size as the Mchip one.
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