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.
Guys I’m having a weird behaviour on my OpenCore instance. The wire keyboard is non responsive when I’m in the stock boot menu (text). I can’t get it to go into any of the items. This happened on the subsequent boot ups post OC installation, not the first. Very weird. I’ve tried it with Windows and Mac (vintage) wired keyboards to no avail. Kind of stuck...
 
Last edited:
Does Open Core have to be installed on your Boot Disk/Drive??
Can it be installed on a non-boot volume attached to your Boot Disk?
 
What is the Cpuid1Data compared to Cpuid1Mask? It appears that Cpuid1Mask is what is used to toggle the feature on and off for updates, but I'm not clear on what the Cpuid1Data field is for....
 
What is the Cpuid1Data compared to Cpuid1Mask? It appears that Cpuid1Mask is what is used to toggle the feature on and off for updates, but I'm not clear on what the Cpuid1Data field is for....

When we turn on the VMM flag, we want to change one bit in the CPU ID and leave everything else the same. So Cpuid1Mask is the "masking tape" and Cpuid1Data is the "paint."
 
When we turn on the VMM flag, we want to change one bit in the CPU ID and leave everything else the same. So Cpuid1Mask is the "masking tape" and Cpuid1Data is the "paint."

Hmm, the analogy makes sense, however with that info, I'm now curious as to why I was told to (on a MacPro5,1) run with the following on normal operation (and with Mask with the 8 in place for VMM):
Cpuid1Data: 00000000 00000000 00000080 00000000
Cpuid1Mask: 00000000 00000000 00000000 00000000

It seems as though both should be all 0s for normal operation, no?
 
Hmm, the analogy makes sense, however with that info, I'm now curious as to why I was told to (on a MacPro5,1) run with the following on normal operation (and with Mask with the 8 in place for VMM):
Cpuid1Data: 00000000 00000000 00000080 00000000
Cpuid1Mask: 00000000 00000000 00000000 00000000

It seems as though both should be all 0s for normal operation, no?
I personally will treat that as

1) keep the Cpuid1Data modified, so that VMM flag is ready to be toggled.

2) Use Cpuid1Mask as the true switch to turn this function on/off.

As long as the switch is off, it doesn't matter what's behind it.
 
How can I remove OpenCore completely? I've decided that for my purposes that DosDude's patch, plus a boot screen via MVC flashed card is sufficient. I have no need for video acceleration, etc.

Thanks.
 
How can I remove OpenCore completely? I've decided that for my purposes that DosDude's patch, plus a boot screen via MVC flashed card is sufficient. I have no need for video acceleration, etc.

Thanks.

See Part 3 of the wiki.
 
Hello On my CMP 4,1 flashed to a 5,1. When I install the 30 inch Cinema Display on the dvi port on my rx 580 the Resolutions are normal can go up to 2560x1600 when I plug in to the the disport or hdmi port using adaptor to dvi I can only go up to can go up 1280x800 resolution on my 30 inch Cinema Display and the card has been flashed by macvideo cards
 
Has anyone tried the 10.15.7 update?

Yes - I did the day after it's release. I had to toggle on VMM in OpenCore 0.6.1 and as my Catalina was initially installed via dosdude1's patcher I set SecureBootModel to "Disabled".
 
anyone is having problems updating big sur from public beta 3 to public beta 4? I mean if I go to check for updates It tells me that I am already up to date. I have already tried to unenroll and re enroll but it’s the same.
I have also clearly Enable VMM flag.
I am on OC 0.6.1 updated by starting from the “clean” config plist on first page and re-applied the suggested various fixes section for HWA, NVME Orange icons fix.
Last thing if can help... in Catalina I have just updated to 10.15.7 with the same OC config without problems.
I’ll attach my actual config in a while.
Thank you by now for anyone who can help me.
Cheers
 

Attachments

  • config.plist.zip
    3.2 KB · Views: 184
anyone is having problems updating big sur from public beta 3 to public beta 4? I mean if I go to check for updates It tells me that I am already up to date. I have already tried to unenroll and re enroll but it’s the same.
I have also clearly Enable VMM flag.
I am on OC 0.6.1 updated by starting from the “clean” config plist on first page and re-applied the suggested various fixes section for HWA, NVME Orange icons fix.
Last thing if can help... in Catalina I have just updated to 10.15.7 with the same OC config without problems.
I’ll attach my actual config in a while.
Thank you by now for anyone who can help me.
Cheers
For Big Sur installation / update, so far, the most reliable way is to completely spoof the cMP into an iMac Pro. The code is in post #7.

Caution: you better sign out your Apple ID before you do that. I am sure quite a few cMP users use that code to install Big Sur already without changing the serial number. Even though there is no user report any issue yet. You still better avoid your Apple ID has any relationship to that "popular serial number". Of course, you can use something like Clover configurator to generate an unique serial number for self use.
 
For Big Sur installation / update, so far, the most reliable way is to completely spoof the cMP into an iMac Pro. The code is in post #7.

Caution: you better sign out your Apple ID before you do that. I am sure quite a few cMP users use that code to install Big Sur already without changing the serial number. Even though there is no user report any issue yet. You still better avoid your Apple ID has any relationship to that "popular serial number". Of course, you can use something like Clover configurator to generate an unique serial number for self use.
I have just followed what you said, I have modified the smbios part according to your post #7 and let cloverconfigurator create a “unique random” serial for an iMac Pro 1.1. The update appeared immediately. The only downside is that I had to connect an hdmi cable to the monitor instead of the DP connector at first boot after the config mods to correctly boot and seen the desktop.
After the update I’ll copy my previous config.plist backup.
EDIT: your posts and helps are always clear and helpful. Thank you
 
Last edited:
  • Like
Reactions: h9826790
I have just followed what you said, I have modified the smbios part according to your post #7 and let cloverconfigurator create a “unique random” serial for an iMac Pro 1.1. The update appeared immediately. The only downside is that I had to connect an hdmi cable to the monitor instead of the DP connector at first boot after the config mods to correctly boot and seen the desktop.
After the update I’ll copy my previous config.plist backup.
EDIT: your posts and helps are always clear and helpful. Thank you

Ok, just installed beta 8 update... now... I have read on previous posts that on beta 7-8 something is changed and we have two (three?) roads for Big Sur to correctly boot:

A: set VMM always ON (like I'm doing in this moment)
B: completely spoofing iMac Pro 1,1 SMBIOS
C: set Secureboot to "Default" on unmodified installation.

now (always if I understood correctly) if I goes to route:

A: we lost something about performance and ACPM.
B: In my case I can't use DP port connections for display but only HDMI
C: i have tried to set Default entry since I don't have used any Big Sur modified installation script but it doesn't boot (maybe I don't understand what "unmodified installation" means).

At this point... what is the best thing to do? I clearly know that attempting to install Big Sur on our 5.1 machines is a risk... is this problem due to apple brick something in the latest build or is to be expected this behaviour since we are "near" to GM?

thank you
 
Hi there,
I install OC/Catalina on my MP 5,1 , just want the BOOT SCREEN with my GTX Titan Black.
I completed the installation with my old 5770 GPU(basic bootpicker/graphic bootpicker works fine)
after that I change to GTX Titan Black GPU, it work just like no OC installed (wont show bootpicker, just black screen -> Catalina login), but i check install again, OC installed. any idea why bootpicker dont show up?
 
Hi there,
I install OC/Catalina on my MP 5,1 , just want the BOOT SCREEN with my GTX Titan Black.
I completed the installation with my old 5770 GPU(basic bootpicker/graphic bootpicker works fine)
after that I change to GTX Titan Black GPU, it work just like no OC installed (wont show bootpicker, just black screen -> Catalina login), but i check install again, OC installed. any idea why bootpicker dont show up?
It kind of does not work for NVIDIA. Can you please use the debug version for logging?
File Swaps
To start, make sure you're using either the DEBUG or NOOPT versions of OpenCore. This will provide much more info than the RELEASE version, the specific files that need to be swapped:

  • EFI/BOOT/
    • BOOTx64.efi
  • EFI/OC/Bootstrap/
    • Bootstrap.efi
  • EFI/OC/Drivers/
    • OpenRuntime.efi
    • OpenCanopy.efi(if you're using it)
  • EFI/OC/
    • OpenCore.efi
1601341363874.png


Misc
Here we'll want to enable the following:

  • AppleDebug: YES
    • Provides much more debugging information, specifically relating to boot.efi and will also store the log to disk.
  • ApplePanic: YES
    • This will allow kernel panics to be stored to disk, highly recommend keeping keepsyms=1 in boot-args to preserve as much info as possible.
  • DisableWatchdog: YES
    • Disables the UEFI watchdog, used for when OpenCore is stalling on something non-critical.
  • Target: 65 (disregard 67 in the picture below)
  • DisplayLevel: 2147483714


1601341030154.png
 
Last edited:
  • Like
Reactions: 6DecadesLater
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.