1set(LEGEND_REVISIONS "25hdd" "25ssd" "35")
2if (NOT DEFINED BOARD_REVISION)
3  set(BOARD_REVISION "25hdd")
4else()
5  if (NOT BOARD_REVISION IN_LIST LEGEND_REVISIONS)
6    message(FATAL_ERROR "${BOARD_REVISION} is not a valid revision for Legend. Accepted revisions: ${LEGEND_REVISIONS}")
7  endif()
8endif()
9