canonkong

It is a H810 ITX board, need to disable above 4G decoding，than use wrap seabios to load the old system. win7 can work well now. But dos/xp need to fix some bugs.

I think we are close to make dos/xp system on it. I can not post the picture here due to it limit 25Kb. Here is the test. SeaBIOS （version rel-1.15.0-0-g2dd469b-dirty-20211209_154707-nico) Press ESC for boot menu. Select boot device: AHCI/0: INTEL SSDSCZBX016T4 ATA-10 Hard-Disk (1490 GiBytes) AHCI/1: INTEL SSDSC2BX0164 ATA- 10 Hard-Disk (1490 GiBytes) 

Maybe can use this: https://github.com/sgzwiz/windows_10_shared_source_kit/tree/master/windows_10_shared_source_kit/windows_10_shared_source_kit/10_1_14354_1000/Source/minkernel/boot/environ

Maybe can use seabios: https://www.seabios.org/Build_overview

Here is a BIOS from lenovo machine, which have no csm funtion, but can work with flashbootpro and video crads work. Maybe can help us to know something. https://www.mediafire.com/file/pr22q0hnenmz77g/P3%2526M950T.7z/file

I also tried to make it work on win7，but the video cards will code12 error when I use flashbootpro.

Flash GBE can change the device ID, recommend to use (7) I219-V gbe, which can drive use official driver.

The motherboard is ASRock Z690 Steel Legend/D5. And here is the moudle I modified from the BIOS. asl file mod.7z

@Dietmar I modified the bios, it can work on xp/win7 above now. Single core boost work fine now.

Need to modify the *inf and *sys file. *inf file is easy to modify, but *.sys need to find out the device ID check and block or over it. After modify the *sys file, you need to use EV certificate to sign it to avoid 52 error code afer installing the mod driver.

Here is some souce code about Intel AMI BIOS: Foxconn: https://github.com/killvxk/LoginDemo/tree/master kabylake: https://github.com/raywu-aaeon/KabyLake_DW08 IceLake-SP: https://github.com/liuwei142536/hamburger_Bios Maybe can help us to modify the bios.

What the debug error is? BIOS often not only one error, like my B650E mainboard, need to fix 5 errors.

@Dietmar Yes, here is the file. CPU Show.7z Original BIOS ACPI table dump:https://disk.yandex.ru/d/75Fwkvp1MmTIcA MOD BIOS ACPI table dump:https://disk.yandex.ru/d/oI9KAZEtugvrWw

@Dietmar Benchmark tests results were all right. I test few B550 and B650 mainbords, all are working fine. Single core frequency and multi-core frequency turbo, standby power and fullload power consumption，CPU thread scheduling are all right.

Modify the BIOS also can solve this CPU problem. The new motherboards usually have the BIOS flashback function, can flash the mod bios very easy.