iMac19,1 (2019 27") without T2 is fully supported for Big Sur. That might be your path forward for opening a support ticket if you can replicate with TB3 PCIe expansion or NVMe via TB3 adapter.
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MP 1,1-5,1 Mac OS 11.3 has broken support for older Mac Pros
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Going back to this. How exactly did you test? Did you replace your 5,1 version with the 6,1 version?
Seems a bit of a coincidence that an older unit patched with something somewhat related to the issue from a supported unit should be working. Might need looking at again.
I tried to install Big Sur 11.3 or 11.4 beta but doesn't work on NVME ON Highpoint 7101 while Big Sur 11.2 is ok using open core 068 Martin Lo
Why is it necessary to run Big Sur on an older Mac Pro? So you can use a Navi GPU? Mojave supports Vega 20 so you should be able to run anything up to a Radeon Pro VII. That should be more than enough juice to handle most anything. If you need more then you need to get a 7,1 Mac Pro. If you need Big Sur for certain apps, but don't need 7,1 level hardware then a 6,1 Mac Pro would be a good choice. I love mine.
I don't understand your question.
This is how 3,1 is patched "an older unit patched with something from a supported unit should be working"
This looks to me more like a sales advise rather than a constructive post. Sorry, what is the reason for this post?
3,1 is older than 5,1 but it works when it is patched with nvme ffs from the supported 6,1 while the 5,1 does not wprk. The issue is *somewhat* related to nvme. It might not be that this is why it works but suggesting this needs to be properly considered as is quite coincidental.
Think about this though. Most of the users here are using the original NVMe.ffs in the cMP5,1 with the same results.
It's a legitimate question. I'm asking what are people's specific reasons. It seems unnecessary to me.
You do realise you don't have to post when you have nothing useful to contribute ... don't you?
Is the original exactly the same as that from the 6,1?
EDIT 1: I get you now. The version used for the patching is from the 5,1. Got confused by some post earlier that said it was from the 6,1. Done it but couldn't recollect which it was. Guess that rules that angle out indeed.
EDIT 2: It might indeed be from the 6,1 in which case this angle needs to be properly considered.
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Fair enough. Although not relevant I can answer for myself. First of all why would someone buy now MP7,1 or even MP6,1? If I would buy something it will be M1 Mac.
No, MP6,1 firmware is a much newer EFI release and it's compiled by a compiler a decade newer with different CPU support.
I saw NVMe boot support how-to guide for the Mac Pro 3,1 / 4,1 / 5,1
"In this step you are going to make a NEW EFI rom with DXEInject using the NVMe driver Apple provides for the MacPro 6,1."
Okay, so an M1 Mac is another alternative for newer supported hardware, but it is entry-level hardware and below a Mac Pro except for single core CPU performance. If your tasks rely on that then it may be a good choice, but even 6,1 graphics are better than an M1. With a 7,1 you can enjoy up to a 6900 XT. So that makes sense if you need crazy graphics performance. My point was that a Radeon Pro VII is very capable, especially for old 5,1 hardware, so I don't see a reason to use an OS newer than Mojave. If you need more power then get a 6,1 or 7,1, or M1 Mac as you pointed out.
Well, needs a closer look if it is from the 6,1. Would at least need to be fully ruled out for the reason posted earlier.
This guide is from 2018ish and made when MP6,1 firmwares got NVMe bootable support with High Sierra EFI firmware updates a year before the MP5,1 - where the NVMe support only came with the successive Mojave EFI firmware updates.
Things changed a lot since then, even the tools that Apple uses to make the MP6,1 firmwares were updated between the old 12x.0.0.0.0 and the current 42x.0.0.0.0. MP6,1 EFI modules are not perfectly compatible with MP5,1 since the EFI version is not the same nor the tools/compilers used and the MP6,1 NVMe module are known to crash with some PCIe switched adapters from time to time. Apple released several updates for the 14x.0.0.0.0 series of EFI firmwares to address some NVMe incompatibilities when booting from PCIe switched cards. One user here was contacted by Apple after bug reports and Apple asked him submitted more detailed bug reports and to test successive EFI firmware releases with his with HPT SSD7101A-1.
We don't know if Apple ever incorporated the same corrections implemented with all the releases between 140.0.0.0.0 to 144.0.0.0.0 to the MP6,1 branch of the NVMe EFI module source code.
MP3,1 firmware is from an even older code base and no one should use a MP6,1 EFI module injected in a MP3,1 firmware nowadays.
Understand all that but people have been following that guide on 3,1 and today, it appears that these 3,1 units with their older code base are booting BS 11.3 from nvme drives without issue while the newer 5,1 has issues.
I presume that as the GarbageCan is supported by BS, it presumably would be working fine too. Problem solving logic says this angle needs looking into somehow ... Not sure how though!
I still can't recollect whether I injected 6,1 or 5,1 nvme into my 3,1 while following that guide.
If I had to stick my neck out, I'll say it was 5,1. Can't recollect dealing with 6,1 stuff.
Even if this is real, which at the moment I'm not so sure, and that the NVMe EFI module is the real culprit - which again I'm not sure, what you are suggesting is not as as easy as you think since between MP61.0120.B00 and 427.0.0.0.0 Apple released more than 30 EFI firmware updates.
First we need to know what exactly NVMe module was injected inside the working MP3,1, then test it. A BootROM dump from someone that has 11.3/11.4 booting from a NVMe drive would make this less than a shoot in the dark.
That would be a start. I suppose a basic checksum would be a start.
Unfortunately, I don't do cutting edge and not running BS myself. My interest is purely to keep the pioneers going until I am ready for it sometime next year or maybe even 2023!
Just realized @nekton1 is doing full spoofing to MP7,1:
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macOS 11 Big Sur on Unsupported Macs Thread
Have you first run the dosdude1 rom upgrade for APFS and NVMe support? Then rebuild a new USB installer using OCLP 0.0.22 or later using the correct MP gestalt and parameter setiings. Install and if successful, finally copy correct EFI folder files from USB installer to NVMe SSD EFI folder on...
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