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X299 Big Sur Support

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Prime X299-A II
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i9 9980XE
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HI all,

I need some help to run Big Sur on a Asus Prime X299-A, RX 580 8GB on the top slot. SMBIOS iMacPro1,1.
I was coming from Catalina and a perfectly working system but after I run Big Sur installer and after it completed the install process Big Sur doesn't boot.
It ends up after long writing text into a Kernel Panic, see image.

I tried other OC EFI I found here, like a General Asus one shared through GitHub by shinoki7 but the system doesn't boot.
Recovery boots up correctly on my EFI.

I didn't even think there would be issues running Big Sur on OpenCore for Asus X299. I was wrong.
Can anyone help me?
I've attached the EFI too.

Thanks all...
I got your same board and it works ok for me, so it's definitely a config issue. I reccommend you to follow the Dortania guide for Big Sur and OC, u'll learn everything you need. Otherwise, you should try @Loloflatsix or @djlild7hina EFIs in the repository.
 
Joined
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HI all,

I need some help to run Big Sur on a Asus Prime X299-A, RX 580 8GB on the top slot. SMBIOS iMacPro1,1.
I was coming from Catalina and a perfectly working system but after I run Big Sur installer and after it completed the install process Big Sur doesn't boot.
It ends up after long writing text into a Kernel Panic, see image.

I tried other OC EFI I found here, like a General Asus one shared through GitHub by shinoki7 but the system doesn't boot.
Recovery boots up correctly on my EFI.

I didn't even think there would be issues running Big Sur on OpenCore for Asus X299. I was wrong.
Can anyone help me?
I've attached the EFI too.

Thanks all...

Make sure you follow the config settings and update your BIOS. Most important BIOS settings are Above 4G Encoding enabled, Disable CSM, and Disable MSR lock.

It should work with my Base EFI (I've tested various boards)

All I added to this EFI compared to my Base 0.6.7 was your USB mapping SSDT and change some of the boot-args

Curious if you've tried a clean install and the same issue happened? I know someone else had issues updating to Big Sur due to some other kexts installed that wasn't compatible.
 

Attachments

  • EFI.zip
    8.4 MB · Views: 34
Last edited:
Joined
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Make sure you follow the config settings and update your BIOS. Most important BIOS settings are Above 4G Encoding enabled, Disable CSM, and Disable MSR lock.

It should work with my Base EFI (I've tested various boards)

All I added to this EFI compared to my Base 0.6.7 was your USB mapping SSDT and change some of the boot-args
I'm coming from Catalina. In Catalina everything worked.
Big Sur Recovery works.
Big Sur itself doesn't.

With your EFI Big Sur doesn't boot, Big Sur Recovery doesn't boot. I mean with the general one.
I will test tomorrow morning thanks for the new EFI!

Is it possible the issue has to do with the graphics card ACPI?
There's a troubleshooting entry in Dortania about it.

Thanks all.
 
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I'm coming from Catalina. In Catalina everything worked.
Big Sur Recovery works.
Big Sur itself doesn't.

With your EFI Big Sur doesn't boot, Big Sur Recovery doesn't boot.
Is it possible the issue has to do with the graphics card ACPI?

Thanks all.

What BIOS are you on and settings?
I don't think it's the SSDT-BRG0 that's causing the issue.

Does this also happen on a clean install?
 
Joined
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What BIOS are you on and settings?
I don't think it's the SSDT-BRG0 that's causing the issue.

Does this also happen on a clean install?
It's 2002 Bios.
Haven't tested a clean install yet.
I'm trying to have the installed one run.
Could it be corrupted?

Tomorrow I try.
 
Joined
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Messages
1,429
Motherboard
ASUS ROG Rampage VI Extreme Encore
CPU
i9-7900X
Graphics
Radeon Pro W5500
Mac
  1. MacBook Air
  2. Mac Pro
Mobile Phone
  1. iOS
It's 2002 Bios.
Haven't tested a clean install yet.
I'm trying to have the installed one run.
Could it be corrupted?

Tomorrow I try.

Ah yeah you need to update your BIOS and follow my recommended settings. If you dont want to update your BIOS you can try this EFI.

Pay attention to these BIOS Settings

CPU Configuration​

  • MSR Lock Control - [Disabled]

Boot​

  • Above 4G Decoding - [On]

CSM (Compatability Support Module)​

  • Launch CSM - [Disabled]
 

Attachments

  • EFI.zip
    8.4 MB · Views: 31
Joined
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Hello guys, Please help me with CSM Support, I'm unable to switch it to Disabled:

I was setting bios options one at a time, saving&rebooting between each one, until I hit CSM Support. As soon as I toggled it to Disabled, then Save & Reboot, upon reboot, my monitor goes into some kind of sleeping mode. I have a full description of my monitor behavior in this forum, if anyone is interested:

But in summary, I see no messages on the screen, the monitor is dark as if my computer is in a sleep mode, and the only way to resolve this is to go through CMOS_SW-reset, starting all over again.
I went ahead and set all other options as from the post#1 above, leaving only this CSM Support as enabled. Saved & Reboot - works fine.

The question is, with CSM Support being enabled, what are my limitations at this point? Why everywhere on Gigabyte bios description, they all recommend to set to disabled? And how shall I proceed? I really hope this is an optional configuration.
 
Joined
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Messages
797
Motherboard
Huawei Matebook D
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i5-8250U
Graphics
UHD 620
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Ah yeah you need to update your BIOS and follow my recommended settings. If you dont want to update your BIOS you can try this EFI.

Pay attention to these BIOS Settings

CPU Configuration​

  • MSR Lock Control - [Disabled]

Boot​

  • Above 4G Decoding - [On]

CSM (Compatability Support Module)​

  • Launch CSM - [Disabled]
All those settings are already set that way.
As I said Big Sur Recovery boots up correctly.

Why the Bios has to be updated?
 
Joined
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Motherboard
ASUS ROG Rampage VI Extreme Encore
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i9-7900X
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  1. MacBook Air
  2. Mac Pro
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  1. iOS
All those settings are already set that way.
As I said Big Sur Recovery boots up correctly.

Why the Bios has to be updated?

Did you try the EFI from my previous post? There were some changes in the BIOS related to MSR lock and AWAC that Big Sur is picky with.

Like I said earlier, if Big Sur Recovery loads fine try doing a clean install on a spare drive to see if it loads. Might be an issue with an incompatible kext or something.
 
Last edited:
Joined
Dec 31, 2013
Messages
797
Motherboard
Huawei Matebook D
CPU
i5-8250U
Graphics
UHD 620
Mobile Phone
  1. iOS
Did you try the EFI from my previous post? There were some changes in the BIOS related to MSR lock and AWAC that Big Sur is picky with.

Like I said earlier, if Big Sur Recovery loads fine try doing a clean install on a spare drive to see if it loads. Might be an issue with an incompatible kext or something.
Thanks a lot!
I will do and report.
 
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