SIBYTE_HDR_FEATURES
#ifndef SIBYTE_HDR_FEATURES
(!! (SIBYTE_HDR_FMASK_ALLREVS(chip) & SIBYTE_HDR_FEATURES))
| SIBYTE_HDR_FMASK_AFTER(chip, pass)) & SIBYTE_HDR_FEATURES))
(!! (SIBYTE_HDR_FMASK(chip, pass) & SIBYTE_HDR_FEATURES))
| SIBYTE_HDR_FMASK_BEFORE(chip, pass)) & SIBYTE_HDR_FEATURES))