I found details in the I/O controller specification how to set the pin I'm trying to set, however, I'm having trouble accessing any of the I/O Controller registers. The evidence of this trouble comes from my attempt to access the LED registers. When I try to turn on and off the LEDs by writing to 0x55600000, nothing happens.

Note, I have erased LOLO so the only startup code running is my own. Before I erased LOLO I was able to turn the LEDs on and off by writing to this address.

My conclusion is that the boot up code maps the CPLD to the address above.

My question based on this conclusion is what do I need to do to configure the I/O control CPLD?

lolo does not remap peripherals, all mappings are 1-1 except
the interrupt vectors. more likely you've changed the bus
settings and can't talk to the cpld, perhaps?

mt

mdobbles, could you shed some light on how you control that VPEN pin or where you found the information on the CPLD?

Posted By mdobbles on 23 Oct 2003 1:25 PM
I''m trying to program flash, but to do so, it appears I need to set the VPEN pin high on the flash part. The VPEN signal can be traced back to the CPLD.

Can you give me some information on how to control the CPLD to raise this pin.