PMP_MAX_DRIVES
if (chp->ch_ndrives == PMP_MAX_DRIVES &&
err = atabus_alloc_drives(chp, PMP_MAX_DRIVES);
KASSERT(port < PMP_MAX_DRIVES);
KASSERT(chp->ch_ndrives >= PMP_MAX_DRIVES);
KASSERT(port < PMP_MAX_DRIVES);
KASSERT(chp->ch_ndrives >= PMP_MAX_DRIVES);
KASSERT(pmpport < PMP_MAX_DRIVES);