MVMEBUS_AM_CAP_BLK
am |= MVMEBUS_AM_CAP_BLK;
MVMEBUS_AM_CAP_BLK | MVMEBUS_AM_CAP_USER,
MVMEBUS_AM_CAP_BLK | MVMEBUS_AM_CAP_SUPER
if (am & MVMEBUS_AM_CAP_BLK)
vr->vr_am |= MVMEBUS_AM_CAP_BLK;