MACSTNADDR1
((uint64_t)le32toh(cpu_read_4(ETSEC1_BASE + MACSTNADDR1)) << 16)
sc->sc_macstnaddr1 = etsec_read(sc, MACSTNADDR1);
etsec_write(sc, MACSTNADDR1, (uint32_t)(macstnaddr >> 32));