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DatAppleGuy99

macrumors newbie
Feb 28, 2020
28
4
A few noob questions,
1; Is there a specific config file I should use for a dual cpu system?
2; Is it posible to boot to a windows 10 hdd?
3; Follow up to question 1, for the dual cpu config is it upgradeable to Catalina?
4; Can there be Catalina updates enabled for updating then disabled after updates?
 

killaninja58

macrumors newbie
May 25, 2018
17
2
A few noob questions,
1; Is there a specific config file I should use for a dual cpu system?
2; Is it posible to boot to a windows 10 hdd?
3; Follow up to question 1, for the dual cpu config is it upgradeable to Catalina?
4; Can there be Catalina updates enabled for updating then disabled after updates?
1) as far as I’m aware no... I have a dual cpu system and don’t have any issues with the normal config file.
2) I believe that for CSM windows then open core won’t work (I could be completely wrong with this) if it’s UEFI then it works a treat! If you do use CSM (legacy install) windows then I would recommend something like rEFInd. It’s a great menu screen!

3/4) I believe that if your system is nativity supported for updates on Catalina then there should be no issue. If yours isn’t nativity supported then I believe that you I’ve to set the VMM flag in the config file if you want to update. Update and then revert the VMM flag and you should be good!
 

DatAppleGuy99

macrumors newbie
Feb 28, 2020
28
4
2) I believe that for CSM windows then open core won’t work (I could be completely wrong with this) if it’s UEFI then it works a treat! If you do use CSM (legacy install) windows then I would recommend something like rEFInd. It’s a great menu screen!

How do I tell if I am using UEFI or CSM?
 

DatAppleGuy99

macrumors newbie
Feb 28, 2020
28
4
Is there a way to reinstall windows with UEFI?
[automerge]1582922918[/automerge]

[automerge]1582922944[/automerge]
I thought I read somewhere that legacy boot would work.
 

killaninja58

macrumors newbie
May 25, 2018
17
2
Is there a way to reinstall windows with UEFI?
[automerge]1582922918[/automerge]

[automerge]1582922944[/automerge]
I thought I read somewhere that legacy boot would work.
There is a way to install Windows in UEFI mode. But I personally advise that if you do, do this then use ROMTool, backup your NVRAM and check it with text editer to see if there’s any certificates from windows already in your NVRAM. If so then I wouldn’t even bother trying to install windows like this. The only reason I have is so that I can use the same m.2 ssd for both High Sierra and Windows 10. You’ll have some trouble with updates so I suggest that your find a windows 10 iso and edit it so that you don’t have any updates anymore. Otherwise this most likely will insert certificates into your NVRAM. If you check your nvram dump and there isn’t any certificates then go ahead and make sure to keep that dump safe!!! It comes in handy, trust me!!
 

handheldgames

macrumors 68000
Apr 4, 2009
1,943
1,170
Pacific NW, USA
There is a way to install Windows in UEFI mode. But I personally advise that if you do, do this then use ROMTool, backup your NVRAM and check it with text editer to see if there’s any certificates from windows already in your NVRAM. If so then I wouldn’t even bother trying to install windows like this. The only reason I have is so that I can use the same m.2 ssd for both High Sierra and Windows 10. You’ll have some trouble with updates so I suggest that your find a windows 10 iso and edit it so that you don’t have any updates anymore. Otherwise this most likely will insert certificates into your NVRAM. If you check your nvram dump and there isn’t any certificates then go ahead and make sure to keep that dump safe!!! It comes in handy, trust me!!

One could back up their ROM....
Install Windows in EFI with OC and disable the writes to VRAM for secure boot.
It's been mentioned in this thread that this leaves just one certificate in the ROM.
Boot back into macos and reflash the backed up ROM without the certificate.

Problem solved.
 
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JeDiGM

macrumors regular
Oct 20, 2018
120
23
Hey everyone. So I just started with this project. Very exciting stuff ?

Here's what I'm trying to accomplish:
-Boot screen on non-flashed card - Vega FE
-Enable FV
-Boot OC from USB

That's it for now. So far I think I've managed to boot from OC loader.

Terminal shows: "4D1FDA02-38C7-4A6A-9CC6-4BCCA8B30102: opencore-version REL-055-2020-02-03"

But i don't have the Boot-Picker screen or Boot screens :( I followed the steps in the OP and did the optional step 9, which I thought was supposed to enable boot screen, but it doesn't seem to be working. Anyone know if I'm missing an obvious step to get this going?

When I boot the USB drive flashes, waits, and then boots into Mojave after about 10 seconds and one more brief flash, which I'm assuming is the timeout time set in step 9 for Timeout.

Any input would be appreciated :)
 
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Dayo

macrumors 68020
Dec 21, 2018
2,257
1,279
Thanks. I had thought that tab only dealt with PCI slots ... How do I ID a specific volume?
Bit of a pain but managed to sort it out.
Steps are:
  • Install Shell.efi
  • Select this from bootpicker on boot.
    • Will show a map of devices but had no hints as to which was what
  • Enter "cls" to clear screen and enter "devtree"
    • Will list devices with partial paths representing path to disk
    • Note associated partial as well as position in list below this if target volume is a partition on the disk.
  • Enter "cls" to clear screen and enter "map -r"
    • Will show a map of devices again
    • Note value corresponding with position noted earlier under partial also noted earlier
  • This is the device path to the volume and can be used in config file.
So, "/Volumes/SomeDrive/Path/to/file.efi" becomes "GobblyGoop/Path/to/file.efi" in OC Config
 
Last edited:

startergo

macrumors 603
Sep 20, 2018
5,022
2,283
Bit of a pain but managed to sort it out.
Steps are:
  • Install Shell.efi
  • Select this from bootpicker on boot.
    • Will show a map of devices but had no hints as to which was what
  • Enter "cls" to clear screen and enter "devtree"
    • Will list devices with partial paths representing path to disk
    • Note associated partial as well as position in list below this if target volume is a partition on the disk.
  • Enter "cls" to clear screen and enter "map -r"
    • Will show a map of devices again
    • Note value corresponding with position noted earlier under partial also noted earlier
  • This is the device path to the volume and can be used in config file.
So, "/Volumes/SomeDrive/Path/to/file.efi" becomes "GobblyGook/Path/to/file.efi" in OC Config
If you change the directory to the OC EFI folder you can issue :
Code:
devtree -d > devtree.txt
map -r > map.txt
Later you can copy the paths from within the operating system
 
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JeDiGM

macrumors regular
Oct 20, 2018
120
23
Quick update, and fix, on the unbootable recovery -

@vit9696 Please ignore my previous bug report as the issue is with the catalina patcher usb installer, already raised with @dosdude1, and not OC.

The catalina patcher is creating unbootable recovery partitions, with a larger parition size of 708.8MB vs 523.5MB, and the only way I could repair recovery is by using Catalina Recovery HD Partition app - thank you @chris1111

Doesn't boot -

View attachment 893589

Boots

View attachment 893590

Tested with and without OC - recovery 10.15.3 now boots perfectly.

Hope this helps all those impacted by this.

Cheers

Thanks both of you. Very helpful.
 

DatAppleGuy99

macrumors newbie
Feb 28, 2020
28
4
One could back up their ROM....
Install Windows in EFI with OC and disable the writes to VRAM for secure boot.
It's been mentioned in this thread that this leaves just one certificate in the ROM.
Boot back into macos and reflash the backed up ROM without the certificate.

Problem solved.
What should I use to back up the ROM, also how do I disable the writes for secure boot?
 

JeDiGM

macrumors regular
Oct 20, 2018
120
23
Big thanks to all who contributed @cdf, @h9826790, @startergo, @w1z and especially to @vit9696

I just booted into my cMP with Radeon VII, I have bootselector via OC, bootscreen, full HW acceleration and internal disc icons on Catalina 10.15.3

My EFI is attached below.

No more need for a Mac Pro 2019 :cool:

View attachment 894152

Thanks for this. HEVC now working on my Mac Pro 5,1 and it's booting to the OS. Still no boot screen or boot picker.

Quick question. I noticed you have some Kexts in your EFI folder. Lilu and WhateverGreen are for HVEC right? But what are the other 2 for? Can i remove those? HibernationFixup and AppleMCE? From my reading, I'm guessing the Hibernation was to try and fix the sleep issues you're having?
 

JeDiGM

macrumors regular
Oct 20, 2018
120
23
Read through the manual, still no joy with boot screen and boot picker. Using Vega FE. I have 3 monitors, 1 4k and 2 2k. Suggestions would be appreciated. I get to the OS without issue. No boot screen though. I feel like i'm missing something essential and simple.
 

startergo

macrumors 603
Sep 20, 2018
5,022
2,283
Read through the manual, still no joy with boot screen and boot picker. Using Vega FE. I have 3 monitors, 1 4k and 2 2k. Suggestions would be appreciated. I get to the OS without issue. No boot screen though. I feel like i'm missing something essential and simple.
Is your power table modified or original vbios?
 

JeDiGM

macrumors regular
Oct 20, 2018
120
23
My apple logo, when it's loading the OS, is gigantic! Lol. Any way to shrink it so it looks proportionate? Tried Scale setting. Did nothing. It's like a quarter the size of the screen!
 
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