How many modders check the bios checksum after mods, and how many actually adjust them?? Do you think the individual modules are necessary or just the main bios file..?? I am just curious..I have my own ideas on this and have logged some results from my own experience... If you don't mind..I wouldn't mind hearing some of your opinions..
When I make a manual Award bios mod, I have a look if the 8-bit checksum is appended after each module (or the modules I've modified) and adjust them of course. There are 3 kinds of Award bioses: 8 bit checksum byte appended after EACH module. 8 bit checksum byte appended after mainmodule only. No 8 bit checksum byte appended, but FFh byte after mainbios module. THIS byte counts to the length of module, shown at cbrom /D I'm also using SLIC's which sum to zero only. At manual Phoenix mods (Lenovo way) I don't need to adjust. (prepare.exe will do the job). Also using cbrom or amimmwin / mmtool 3.19 I don't need to adjust.... At AMI SSV2 for MSI I correct the header which is 10h bytes in front of 1b module (as described at my instructions). I also add 89h to correct the entire checksum of bios after I've inserted the SLIC (as described there as well).