I can't find anywhere BIOS-POST codes related to General Software. What mean 0x0d is? It looks like CMOS(Superio) is not running? But I check the FDC37B782, some signal looks good, OSC14M/IOW/IOR has toggled, AEN is low, rstdrv is low, NPOWERON is low, why? Have I make any mistake? Somebody knows anything? [ This message was edited by: vehicle007 on 12-04-2005 12:45 ]
From my experience with the General Software BIOS, the 0D postcode happens when the CPU can not access the Combo I/O chip. It downloads lots of stuff in it to initialize it, but it will not post any malfunction until it does the CMOS shutdown register test.
So something is wrong with the basic accesses to your Combo I/O chip. Is the base address the same as the one of the demo board?
From your drawing I meant the config address. This is the I/O address to turn the device on/off and where all the functions are configured. At power-on the device is off. You have two choices. If the one you choose is different from the one expected by the BIOS, you will get a ''0d'' post code. (doesnt mean that this is your bug, but this is one possibility)
Are you running from the demo board BIOS or are you customizing yours? If you use the BIOS form the demo board, make sure that you use the same configuration resistors as the demo baord.
if you used demondtration copy from GeneralBios (actually from whatever company..) the default setting for SIO base adress is 0x370 so the pin #115 (nrts1) should be pulled up. but your schematic shows it is floating. this is obvious mistake.
0x370 is default value for SIO access. you can modify the circuit to pull down nRTS1 pin and you can change the Base address to 0x3F0 in BIOS menu when Hardware work has been done.