MAC_ADDR_LOW
unsigned int mac_l = rdlp(mp, MAC_ADDR_LOW);
wrlp(mp, MAC_ADDR_LOW, (addr[4] << 8) | addr[5]);
unsigned int mac_l = rdl(pep, MAC_ADDR_LOW);
wrl(pep, MAC_ADDR_LOW, mac_l);
reg_space[MAC_ADDR_LOW / 4] = readl(ioaddr + MAC_ADDR_LOW);
stmmac_set_mac_addr(ioaddr, addr, MAC_ADDR_HIGH, MAC_ADDR_LOW);
stmmac_get_mac_addr(ioaddr, addr, MAC_ADDR_HIGH, MAC_ADDR_LOW);