You can find this file in the BSP Layer at:
meta-<bsp_name>/README
This file provides information on how to boot the live images that are optionally
included in the binary/
directory.
The README
file also provides special information needed for
building the image.
At a minimum, the README
file must
contain a list of dependencies, such as the names of
any other layers on which the BSP depends and the name of
the BSP maintainer with his or her contact information.