nviic_read
u_int8_t nviic_read(struct nviic_controller *, bus_size_t);
if (nviic_read(nc, NVI_SMB_PRTCL) == 0)
sts = nviic_read(nc, NVI_SMB_STS);
b[i] = nviic_read(nc, NVI_SMB_DATA(i));