On Mon, 30 Dec 2002, sivakumar wrote:
I am porting the northbridge 82845e for my motherboard. While coding raminit.inc file, I took the file from the 82830 chipset directory and modified as per the requirement of the 82845e chipset. Now I want to know, How to get the register value of the regsiters, like DRB DRAM ROW BOUNDARY REGISTER and etc. Do I need to read these regsiter value from the system using normal BIOS? I could not find much details about the values in the specification. Is my assumption is correct?
now it gets hard. You need to understand how to read the SPD information and program these registers from SPD. Using BIOS settings is in most cases unnecessary, except for undocumented magic bits which are occasionally there.
Check out the code on e.g. the 440gx which reads SPD and programs the north bridge from this SPD data. That will give you an idea of how to proceed.