CSIZE_LATTIME
pci_conf_read(pa->pa_pc, pa->pa_tag, CSIZE_LATTIME);
pci_conf_write(ahc->bd->pc, ahc->bd->tag, CSIZE_LATTIME, 0);
pci_conf_read(pa->pa_pc, pa->pa_tag, CSIZE_LATTIME) & CACHESIZE;
pci_conf_write(pa->pa_pc, pa->pa_tag, CSIZE_LATTIME, 0);