AMD GPU firmware editor, load a rom file and change clock speeds, voltages, fan control, read hidden details, replace sections and much more! - Andybf/AtomBiosEditor
You would probably be better served if you have an edited or updated vBios that just requires flashing to the HD7770, rather than editing the vBios yourself. The link below contains a list of all the vBios's that have been uploaded to TechPowerUp for the HD7770. You might want to check to see which vBios yours uses, and whether a newer version is available. Then see what the newer vBios offers.
I’m not really the guy to run on unlimited supply of patience, so this will be more a mix of tutorial, tool to do the job for you, assistance (“as long as you don’t insist with unlimited/unrelated questions” kind) and ABSOLUTELY NO GUARANTEES. Users should read this again, I am not offering any...
Extract your VBIOS using GPU-Z and run it through the utility. Then flash it using the link Edhawk shared for AMD Flashing. As you're essentially flashing back the same VBIOS just updated there shouldn't be any issues. Just keep a backup just in case.
Good to hear you have the card up and running in Sonoma. It is difficult to tell what patches and edits have been enabled, as you are using OCLP and an edited vBIOS.
With this Haswell system running a non-natively supported version of macOS, I am assuming you have disabled the IGPU in the BIOS. As you are using an SMBIOS for an Apple system that lacks an IGPU. That you are only using the HD7770 for graphics processing. Is that correct?
If you have used OCLP to enable both the IGPU and HD 7770, then you may be the architect of your own downfall regarding DRM, especially as you are using the iMacPro1,1 SMBIOS.
Are you using the top two boot arguments shown below? With the alternative vBios you may not need radpg=15, depends on what was changed in the vBios you are using.
If yes, then you probably don't need the bottom boot argument.
What level of metal support is being shown for the HD 7770 in the System Information > Graphics/Displays report. The screenshot below shows the Graphics/Display report for my AMD X570 system, as an example.
For the time being I am using just radpg=15 (this is needed for the initialization of the HD7770) and amfi_get_out_of_my_way=1 (as OCPL could not patch the needed gpu kexts back to S/L/E without first disabling AMFI).
OCLP was only used for patching back the necessary GPU kexts. (I just ran the post boot patches for GCN cards).
There is no setting in my BIOS to disable the iGPU this is why I used the iMacPro1,1 smbios.
I will check tomorrow about the version of metal support but I think it just said metal support : yes.
I will also try to add -radcodec and will let you know.
What I tried was to add the -radcodec argument and also add the unfairgva to device properties.
The card is metal supported but the decoder fails...
Please see the screenshots.
I will try tomorrow to also add the -wegnoigpu argument.
Unfortunately I do not know how to create an SSDT for disabling the iGpu.
Post a copy of the files you can generate from Hackintool > PCIe devices tab (bottom right icon), I may be able to create an SSDT that will disable the IGPU.
Hackintool > PCIe tab 'Export' icon highlighted
This will generate 4 x files, add them to a folder, zip and attach a copy of the folder.
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