Gonna update this reply with the multiplier settings supported by the 500mips labeled idragon.
On my freeway motherboard I have switches 5,6,7 I assume these correspond to pins bf0,bf1,bf2
With that assumption in hand,
1=on 0=off
Bf0, bf1, bf2
0,0,0 = 3.5x
1,0,0 = 2x
0,1,0 = 3x
1,1,0 = 2.5x
0,0,1 = edit: 3.5x
1,0,1 = 2x
0,1,1 = 3x
1,1,1 = 2.5x
It is very interesting that the 0,0,1 setting gives a post code, suggesting it may actually be a multiplier beyond the supported clock of the chip?? Unsure. I was running 66fsb
I also tried a little overclocking
After probing the multipliers, I set fsb back (up) to 100mhz. And programmed in the 2.5x setting.
It posts, and boots memtest.
I powered down and tried 3x, and powered it on, the system hangs immediately with audable beeps, so it seems that the mysterious multiplier was possibly 4x because that would give 266mhz which would make sense, because 0,0,1 got further into post than 300mhz did.
At 250 mhz in memtest I am seeing errors.
Lemme bump the voltage and see what we get
Okay, 2.3v 66mhz bus. I got the chip to post and load memtest. Turns out it is the 3.5x setting which actually shows that there are no bf2 programmed multiplier combinations on this chip. Why it crashed earlier only on that setting I am unsure.