canonkong

@Dietmar csmwrap not have any INT13 problem. It was never the issue. I was able to boot DOS successfully on my Arrow Lake machine, also can boot XP system but meet A5/7E BSOD.

@Dietmar What about your bios setting？Security boot and fast boot must be disabled. And I recommend you only use only one disk to test it, because not all the machines will boot the NVMe or SATA or USB first, csmwrap only load the first disk it detects. Your disk must be MBR mode, I recommend you install the system use WinNTsetup in PE, after installing the system, not to reboot the machine before you delete the hole EFI folder in that system disk, and you need to build a new EFI\Boot folder and rename the csmwrap.efi to bootx64.efi into that folder. Than reboot the machine and remove the USB drive.

@Dietmar The board is Maxsun Z890-A Wi-Fi. This motherboard is a bit expensive, about €116. If the price is higher than this, it is not recommended to purchase it

@Dietmar The ARL platform will A5 BSOD with Xp sp3，when I fix A5 bsod problem，then I meet 7E BSOD.

@Dietmar If you want wo boot the system on Intel ARL platform, use csmwrap 1.2.0 version. Also need an AMD cards which its GOP version can not higher than 1.54.0.0.0, than it will be work. I used R5-240 and Radeon 520 flash mod vbios, than they work.

@Dietmar For example, I have a 256G SSD. Utilize DiskGenius to convert the format of this 256GB hard disk to MBR mode, and subsequently create two primary partitions. One of these partitions must be formatted in FAT32 with a size ranging from 100MB to 300MB. Next, establish a folder titled "EFI\BOOT" within this partition and place the file "bootx64.efi" (formerly known as "csmwrap.efi") inside the "EFI\BOOT" folder. The other primary partition can be formatted as either FAT32 or NTFS for the purpose of installing the operating system. Upon startup, the computer will automatically boot from "bootx64.efi", which will then search for and initiate the operating system from the installed hard drive. And one important thing, disable Above 4g MMIO BIOS Assignment, only gigabye intel 800 series mainboads have this setting. If you not have gigabye intel 800 series mainboads, I thing can give up. Because I tried to disable it for ASUS/MSI, but faild, even I used mod bios.

@Dietmar It only can work on MBR disk, don’t use gpt.

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