Embedded Systems/AT91SAM7S64
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The AT91SAM7S64 is a noteworthy instance of the ARM processor architecture because of the availability of affordable prototyping hardware (1, 2, 3) and of on-line tutorial information (1, 2). There is a bootloader for it as well.
Image of Olimex board at http://www.olimex.com/dev/images/ARM/ATMEL/SAM7-Hxxx-1.jpg
There are a number of interesting projects documented for this controller (1, 2).
My hope for this page is to work up a getting-started guide for the cheapest SAM7 board I can find, which is thusfar the Olimex board.