[SOLVED] Can\'t install Windows 7 on UEFI Class 3

Win-Raid Forum (Drivers - Firmware - Modding) � OS related Topics � Windows 7/Vista/Server 2008 � [SOLVED] Can\'t install Windows 7 on UEFI Class 3

Topic settings

Print view

Jump to forum

General & Forum related Topics News / Announcements Forum-related Questions & Suggestions Off Topic Important Drivers (AHCI/RAID, NVMe, USB etc.) General: Storage Drivers (AHCI/RAID, NVMe and USB) Specific: Intel AHCI/RAID Drivers Specific: NVIDIA nForce Chipset Drivers (incl. AHCI/RAID) Specific: NVMe Drivers Other Drivers System Performance RAID Performance AHCI/NVMe Performance Solid State Drives BIOS Modding BIOS Modding Guides and Problems BIOS modules (PCI ROM, EFI and others) BIOS Modding Requests Reports: BIOS Modding Results Offers: Already modded special BIOSes Special Topics Intel Management Engine CPU Microcodes NVMe Support for old Systems Other Tools (not BIOS modding related) Interesting PC Hardware & Software OS related Topics Windows 11 Windows 8-10/Server 2012-2019 Windows 7/Vista/Server 2008 Windows XP/2000/Server 2003 DOS/Windows 3.X/9X/ME - Retro Gaming Other Operating Systems

#1 | [SOLVED] Can't install Windows 7 on UEFI Class 3 datum

Wed Feb 10, 2021 4:47 pm (Last edited: Wed Feb 10, 2021 9:50 pm)

Hey guys! I want to install Windows 7 on my Mac Pro 5,1 but the install just wont boot. I am using OpenCore bootloader as a boot menu to have a boot screen on macOS or load GRUB. The graphics card I have built is an RX 580. I have tried using a guide on youtube (look up install windows 7 dism method) to install Windows 7 and make my own installer ISO using Integrate7 but none of these methods worked. Is there a way I could end up with a working windows 7 install?

reply

#2 | RE: Can't install Windows 7 on UEFI Class 3 datum

Wed Feb 10, 2021 4:57 pm

@formerlychucks

you need this - https://github.com/manatails/uefiseven

reply

#3 | RE: Can't install Windows 7 on UEFI Class 3 datum

Wed Feb 10, 2021 5:23 pm

Ok, I will try that method. I'll get back to you if it works.

reply

#4 | RE: Can't install Windows 7 on UEFI Class 3 datum

Wed Feb 10, 2021 5:34 pm

won't work, stuck at starting windows @infuscomus

reply

#5 | RE: Can't install Windows 7 on UEFI Class 3 datum

Wed Feb 10, 2021 5:35 pm

@formerlychucks

contact the developer on github, they should be able to help you.

reply

#6 | RE: Can't install Windows 7 on UEFI Class 3 datum

Wed Feb 10, 2021 6:05 pm (Last edited: Wed Feb 10, 2021 6:08 pm)

found out why it doesn't work, it fails to unlock the C0000:CFFFF address space. the issue lies in the graphics card vbios.

EDIT: doesnt necessarily have to be the vbios

reply

#7 | RE: Can't install Windows 7 on UEFI Class 3 datum

Wed Feb 10, 2021 6:30 pm

hmm, I could just patch the vga address in the source code.

reply

#8 | RE: Can't install Windows 7 on UEFI Class 3 datum

Wed Feb 10, 2021 9:46 pm (Last edited: Wed Feb 10, 2021 9:50 pm)

does anyone know where the vga rom address space is located? I tried 0x80000 but it did not work

EDIT: successfully patched the uefiseven driver, thx for showing me that tool :D

reply

#9 | RE: Can't install Windows 7 on UEFI Class 3 datum

Mon Feb 22, 2021 6:55 am

Hi @formerlychucks
Thanks or the post and letting others know that this is fixed. However it looks like the fix is a customized one. May I request you to please add what you did? Where did you patch or hardcode the address and how you rebuilt the module? This may help others facing similar issues in future.
Thanks

reply

#10 | RE: Can't install Windows 7 on UEFI Class 3 datum

Thu Aug 12, 2021 12:28 pm (Last edited: Thu Aug 12, 2021 12:34 pm)

@formerlychucks How you patched the UefiSeven in order to successfully boot Windows 7, Vista and Server 2008 (R2) in UEFI w/o CSM?

reply

Installing Windows Server 2008 x86 on Dell PowerEdge R630 � � [Problem] Win7 Installation onto MEDION AKOYA S15449

Please enter a reason for warning.