Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Status
The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
It wasn't identifying as an iMac so I thought it may have been booting off my working Catalina OpenCore EFI so I removed all drives and reinserted the iMac code into the drive I am trying to make Big Sur and turned of the VMM Flag. The computer boots to 3/4 of the progress bar then kernel panics. Is it because I have a R280X that the computer can't spoof as a iMac Pro?

I checked my Config file in OpenCore Configurator and it is system identifying as a iMac Pro 1,1

try my EFI folder
 

Attachments

  • EFI.zip
    2.6 MB · Views: 121
Just did the update from 10.15.5 to 10.15.6 without VMM flag. No issues so far. Nerve-racking since its booting into a new installer. Radeon Vega card, fan spins normally.
 
Just did the update from 10.15.5 to 10.15.6 without VMM flag. No issues so far. Nerve-racking since its booting into a new installer. Radeon Vega card, fan spins normally.

How is this possible? I only installed OC last week, but my understanding is that VMM needs to be on to even see the update (I have it off, and my System Update currently shows no update on 10.15.5 for me). Did you download the update direct from the Apple website?
 
How is this possible? I only installed OC last week, but my understanding is that VMM needs to be on to even see the update (I have it off, and my System Update currently shows no update on 10.15.5 for me). Did you download the update direct from the Apple website?
SMBIOS spoofing, if he is using AMD hardware acceleration and forcing the board-id of iMac Pro, then the software updates will pass the logic test in the distribution file and will work.
 
I followed all the steps in post 1 and hardware accelerated encoding / decoding is confirmed with VideoProc. I believe I therefore have a 'hybrid' iMac Pro SMBIOS. Does this mean I can install updates that I've downloaded from Apple? Does VMM only need to be turned on if I want to use Software Update?
 
I followed all the steps in post 1 and hardware accelerated encoding / decoding is confirmed with VideoProc. I believe I therefore have a 'hybrid' iMac Pro SMBIOS. Does this mean I can install updates that I've downloaded from Apple? Does VMM only need to be turned on if I want to use Software Update?
VMM flag spoofing is the only way to update a MP5,1 that still identify itself as a MP5,1 board-id and model as MacPro5,1.

I'm not sure if the hybrid MP5,1/iMac Pro can update without VMM, someone that uses it please confirm, but the complete SMBIOS spoofing works for updates.
 
  • Like
Reactions: Hot-Mac
SMBIOS spoofing, if he is using AMD hardware acceleration and forcing the board-id of iMac Pro, then the software updates will pass the logic test in the distribution file and will work.
Yes, this is how it is. The update just showed up. It does say Mac Pro 2009 in the About this mac tho.
 
Question for you guys, could anything on the Opencore plist be preventing Windows from booting with my 1070FE installed?
 
Most likely you haven’t turn off the VMM flag after your initial Catalina installation.
Thanks, I'll give that a shot, (I've actually decided to run it with High Sierra as I want one GPU for both OS - wonder if that has a bearing).
 
Updating from 10.15.4 to 10.15.5 via combo updater with OpenCore 0.5.9 and got "This software is not supported on your system."

catalinaupgrade.jpg


What should be done to work around this?
 
Enable VMM on OpenCore config?

Oh that's right - slipped my mind. Are we supposed to enable it for updates and then disable for running regularly?

Additionally, I thought I'd run this a little differently in that I installed OpenCore on an SSD in Slot 1 with Mojave on the MacPro5,1 while I'm actually booting to Catalina on a separate PCIe SSD attached drive. I'm finding that when I boot sometimes to Catalina that it fails (presumably panics; have verbose boot enabled, but no actual visible panic) and then when I try to boot to Mojave it boots Catalina... Seems as though OpenCore has its wires crossed somehow. Any thoughts?
 
I'm finding that when I boot sometimes to Catalina that it fails (presumably panics; have verbose boot enabled, but no actual visible panic) and then when I try to boot to Mojave it boots Catalina... Seems as though OpenCore has its wires crossed somehow. Any thoughts?
I don't think OpenCore itself cause this problem (unless your config isn't following cdf's recommendation).

I can always switch between Mojave / Catalina / Big Sur with 100% success rate.
 
Can OpenCore be used to boot a Snow Leopard disk? I take it for granted it can also boot up High Sierra. Correct?
 
Last edited:
SMBIOS spoofing, if he is using AMD hardware acceleration and forcing the board-id of iMac Pro, then the software updates will pass the logic test in the distribution file and will work.
I haven't adopted OpenCore yet, as I still have some doubts. I don't particularly like the idea of fiddling with the VMM flag, as it appears you have to set it on and off (unless one is happy to take a 5% performance hit). On the other hand, if I were to permanently identify the Mac Pro 5,1 motherboard and the computer itself as an iMac Pro, wouldn't there be other problems, such as Continuity/Handoff/Airdrop functionality. Would FaceTime work. Would Messages work? Would Auto Unlock with the Apple Watch work? If one adopts an iMac Pro identity, what would the computer serial number be? The original one (i.e., that of a Mac Pro 5,1) or one befitting an iMac Pro?
 
I applied Part I of the instructions and was able to successfully install OpenCore and Catalina.
I do not however get a boot screen.

I'm running a
  • Mac Pro 4,1 (flashed to 5,1) with
  • Xeon W3670 and
  • MSI GT 710 1GD3H (Nvidia GK208).

I was expecting a basic boot screen. Am I missing something?
 
I applied Part I of the instructions and was able to successfully install OpenCore and Catalina.
I do not however get a boot screen.

I'm running a
  • Mac Pro 4,1 (flashed to 5,1) with
  • Xeon W3670 and
  • MSI GT 710 1GD3H (Nvidia GK208).

I was expecting a basic boot screen. Am I missing something?
Your GPU does NOT have the required UEFI GOP
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.