TCX_REG_STIP
if (sa->sa_reg[TCX_REG_STIP].oa_size < 0x1000) {
sa->sa_reg[TCX_REG_STIP].oa_size);
sc->sc_physaddr[TCX_REG_STIP].oa_space,
sc->sc_physaddr[TCX_REG_STIP].oa_base,
{ TCX_USER_STIP, 1, TCX_REG_STIP },