Aaeon SBC-590 User Manual page 23

J3, J4 must be set to match the CPU type. The chart below shows
the proper jumper setings for their respectiver Vcc:
Vcc = 3.3V*
Vcc = 3.45 V
Vcc = 3.6 V
Vcc = 3.8 V
* default
16 SBC-590 User's Manual
J3
1
2
3
1
2
3
1
2
3
1
2
3
J4
1
2
3
1
2
3
1
2
3
1
2
3