Most ATAGS based board files are completely unused and are
scheduled for removal in early 2023, and left out of kernels
by default now. If you are using a board file that is marked
as unused, turn on this option to build support into the kernel.

To keep support for your individual board from being removed,
send a reply to the email discussion at
https://lore.kernel.org/all/CAK8P3a0Z9vGEQbVRBo84bSyPFM-LF+hs5w8ZA51g2Z+NsdtDQA@mail.gmail.com/