Well guys [and girls of cours]
I think i found something
here at this url from sun :
http://192.18.99.138/805-6805-10/805-6805-10.pdf
and if you look at page 49 or so
you can see that there are two jumpers on the mother board:
J2703 == Flash PROM Write Protect /Write Enable
J2804 == Flash PROM Hi-Lo Booting

can anyone help me with these Jumpers ?