how to change the MAC address of RTL8139

i bought a second hand mini-itx motherboard.
while installing linux, i found the mac address was ff:ff:ff:ff:ff.

although i can use the command below to change the mac address after
installing linux, but it isn't convenient to me.
(for example, i can't upgrade packages while installing linux)

ifconfig eth0 hw ether 00:11:22:33:44:55

there is a program named Pg8139.exe, people who use 8139 A/B/C chipset
can use it to change the mac address stored in EEPROM of NIC.

you can download from:
http://www.orbitalnet.com.ar/red/RTL8139/PG/