I can understand why you prefer native bootscreen support. But did you ever try OpenCore? Its UEFI GOP boot picker works very well for Radeon VII actually.
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MP 1,1-5,1 Experience with MacVidCards Europe RX 6600 XT - no bootscreen
- Thread starter jsts
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Ja, not the intention I was going for unlikely. I need a native boot screen as i have to be able to switch between different os.
So far..after long testing (16h up to now), it worked for me to get the bootscreen working.
NVram reset did not work. I disconnected it from power and also unplugged the mainboard battery for 15 min. Everything back in i started catalina and installed everything new, with both cards inside only working on the old 4870 with cinema connected. The rx6600 is connected hdmi to the Acer display and stucks/always showing the bootscreen with picking devices.
The other monitor runs normal os Catalina. I did exactly the instructions from macvidcards for installing Monterey (it only works with Monterey installer version 17.2.03 -> osx12.2.1).
I tried different ones all failed except this one.
After making the 2 bootable usb sticks with opencore and the other with micropatcher, i restarted the machine with opencore stick in it. Still having both cards in the Mac Pro. Bootscreen appeared and I have choosen the efi opencore like described in the instructions resulting in a black install screen with Apple logo but the progress bar keeps being unfilled..no progress at all.
I decided to only let the new card in, connected to the Acer via hdmi and rebooted. It worked having choosen the efi boot opencore again and then Monterey installer.
What should I say..it works finally.
It showed boot screen with device picker and it also started installation with progressbar filling up. 20 minutes to go.
Hopefully…
So far..after long testing (16h up to now), it worked for me to get the bootscreen working.
NVram reset did not work. I disconnected it from power and also unplugged the mainboard battery for 15 min. Everything back in i started catalina and installed everything new, with both cards inside only working on the old 4870 with cinema connected. The rx6600 is connected hdmi to the Acer display and stucks/always showing the bootscreen with picking devices.
The other monitor runs normal os Catalina. I did exactly the instructions from macvidcards for installing Monterey (it only works with Monterey installer version 17.2.03 -> osx12.2.1).
I tried different ones all failed except this one.
After making the 2 bootable usb sticks with opencore and the other with micropatcher, i restarted the machine with opencore stick in it. Still having both cards in the Mac Pro. Bootscreen appeared and I have choosen the efi opencore like described in the instructions resulting in a black install screen with Apple logo but the progress bar keeps being unfilled..no progress at all.
I decided to only let the new card in, connected to the Acer via hdmi and rebooted. It worked having choosen the efi boot opencore again and then Monterey installer.
What should I say..it works finally.
It showed boot screen with device picker and it also started installation with progressbar filling up. 20 minutes to go.
Hopefully…
I thought about it, really.
I have converted my Radeon VII with waterblock in my x86 amd Gaming station and it works like a charm.
For putting it pack to the Mac i would have to do the conversion back to normal which will result in the loudest graphics card i have ever heared. Fast but very loud.
So I preferred the described way above as i will use the Mac Pro mainly for Homeoffice use. So no Manor graphics hungry applications that will beat the rest out of him.
May the plan works now.
Jsts what version did you exactly install or try to install?
Br
Chris
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Also cinema works fine.
Switching to windows is a little bit confusing as the screen stays black at boot and then suddenly the windows logo appears. But all works fine for me now.
Hope this helps anyone.
Just stay absolutely exactly to what’s described on macvidcards and maybe you do the nvramreset with battery.
This worked out for me and Monterey 12.2.1
@h9826790
You are absolutely right. Opencore would have been the solution then if this would not have been working for me. It is the only way you can use the Radeon VII in Mac Pro 5.1 originally.
Thx for that.
BR
Chris
Switching to windows is a little bit confusing as the screen stays black at boot and then suddenly the windows logo appears. But all works fine for me now.
Hope this helps anyone.
Just stay absolutely exactly to what’s described on macvidcards and maybe you do the nvramreset with battery.
This worked out for me and Monterey 12.2.1
@h9826790
You are absolutely right. Opencore would have been the solution then if this would not have been working for me. It is the only way you can use the Radeon VII in Mac Pro 5.1 originally.
Thx for that.
BR
Chris
Attachments
I have noticed from RefindPlus logs from various users that while Mode 0 is usually that with the highest resolution indeed, it is not always the case. In such cases, whatever happens to be the highest mode number has the max resolution. As said though, Mode 0 is indeed usually that with the max rez.
Sorry, but I still don't understand what exactly you did to make the white Bootscreen appear.
No. I think it's useless. I have decided to sell the MacVidCards RX6600. I took the RX6600 out and put the Nvidia GTX 680 back in and am contemplating switching to the new Apple Silicon MacPro as soon as it becomes available.
I thank everyone for their support and help.
Don’t sell it yet you can try the OC GOP boot screen patch to the original card vbios.