I have the feeling this is really a simple question, but it's a hurdle I have to get over...

We've bought a couple of the Logic eval kits (FireEngine/ITX) to do development on. I want to hang a bytewide parallel device onto a CF processor; for the sake of discussion let's say it's a Hitachi character LCD.

Looking at the ITX board schematics, I see that the PC104 connectors have FlexBus signals on them, including 3 FBCS lines. I decide I want to generate FBCS3 for my LCD.

I cleaned the solder out of the PC104 holes and put a scope probe on pin C6 of J21; this is labeled "FB_CS3#". Next, I boot into dBUG, start losh, and type this:

>> losh> w 0x10000524 0x04000000
>> losh> w 0x10000528 0
>> losh> w 0x1000052c 0x00000040

This should set the processor up to generate a strobe on FBCS3 whenever I access the address 0x04000000. So next I type:

>> losh> w 0x04000000 0xff

And I get nothing -- not even a losh prompt. I also don't get a strobe on FBCS3.

(FWIW I get the same result if I write to 0x04000000 without setting up the FB registers first)


What am I missing?


I suspect there are more registers that need to be set up before I do this, but I dunno.