The web site refers to "Board Support Package (BSP) Developer’s Guide" but when you open the document, the title reads: "Board Support Packages (BSP) Developer’s Guide". Not the "s" on "Packages" which I believe is incorrect. Title should be corrected on the document.
I will fix this title.
http://git.pokylinux.org/cgit/cgit.cgi/poky/commit/?id=86c776156754cf33dc0136fcff95c26f697d8679
Title changed.