Get Buildroot
The root filesystem images are
jffs2
or
ubi
filesystem images containing an entire embedded Linux system. These filesystems are read/write capable and are designed to be stored in
NAND FLASH memory available on AT91SAM EK boards.
The root filesystem image depends on instruction set i.e. the one for Cortex-A will not work on ARM926 based devices.

The
version
number indicates the official version of Buildroot on top of which at91 patches has been pushed.
If you have chosen this way to get Buildroot images, you can skip the building part and go directly to
BuildRootUse.