StationAddr
PXE_MAC_ADDR StationAddr;
PXE_MAC_ADDR StationAddr;
outw(addr16, BASE + StationAddr);
outw(addr16, BASE + StationAddr + 2);
outw(addr16, BASE + StationAddr + 4);
#define IOSYNC do { readb(nic->ioaddr + StationAddr); } while (0)
writeb(nic->node_addr[i], ioaddr + StationAddr + i);