From Low cost, low power, android ARM system board by - pico WiKi
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Building Bootstrap

Bootstrap initializes the board components and loads the kernel.CPU ROM code looks for a file named BOOT.BIN on the first FAT partition from the microSD card. If the BOOT.BIN is found, the code is loaded and executed. The BOOT.BIN can load the linux kernel or some other application if needed.

Source for the picoSAM9G45 tailored bootstrap is available here: bootstrap git repository

To compile, edit the script from at91bootstrap folder and change CROSS_COMPILE to point to your toolchain.
Then you can run script to compile a new bootstrap image.
Image will be generated in bin/ folder.

  git clone git://
  cd bootstrap-sdcard/at91bootstrap
  ls -l bin/BOOT.BIN