BUA
sc->uh_mr = BUA(sc->uh_uba)->bn_map;
BUA(sc->uh_uba)->bn_biic.bi_csr |= BICSR_ARB_NONE;
BUA(sc->uh_uba)->bn_biic.bi_csr |= BICSR_STS | BICSR_INIT;
while (BUA(sc->uh_uba)->bn_biic.bi_csr & BICSR_BROKE)
BUA(sc->uh_uba)->bn_biic.bi_intrdes = ba->ba_intcpu;
BUA(sc->uh_uba)->bn_biic.bi_csr =
(BUA(sc->uh_uba)->bn_biic.bi_csr&~BICSR_ARB_MASK) | BICSR_ARB_HIGH;
BUA(sc->uh_uba)->bn_vor = VAX_NBPG + (VAX_NBPG * allocvec++);
uba_attach(sc, BUA(sc->uh_uba)->bn_biic.bi_sadr + UBAPAGES * VAX_NBPG);
BUA(sc->uh_uba)->bn_csr |= BUACSR_UPI;
BUA(sc->uh_uba)->bn_dpcsr[bdp] |= BUADPR_PURGE;