^^^^OK, maybe you're correct, but my point was it appears it's impossible to install Mojave without a metal capable card. And if that's true, than I further believe that you will not be able too update firmware without a metal capable EFI card. So, while an EFI GT120 may be able to boot to an unaccelerated desktop while in Mojave, you may not be able to do anything with it.
So, again, what's the point?
Lou
IMO, the whole idea of having GT120 is just able to display without any OS driver support. This is crucial for rescue purpose.
With that EFI display ability, we able use boot manager, able to use recovery partition, able to install / enable web driver, able to use single user mode, able to run AHT / ASD, able to flash firmware...
And the GT120 will still able to perform firmware upgrade. It's Mac EFI has the ability to put the cMP into firmware flashing mode (by holding the power button during boot), this procedure happens well before the cMP start to locate the OS. Therefore, again, it's completely OS independent. And once firmware flashing mode is activated, we can update / patch / or even downgrade the firmware to whatever we want. This won't and can't be changed in 10.14, because the process is OS independent.
So far, the only restriction I can see is just may be unable to install the OS with GT120 only. However, GT120 is still a very good emergency card, because it can do all the above.
And none of us said we want to run / install 10.14 with just the GT120. That's just an emergency card to assist the primary GPU. As long as 10.14 can be installed with any Metal supported GPU, e.g. my 1080Ti, I can still install 10.14 with the GT120 + 1080Ti combo. And once 10.14 installed. Use the GT120's display ability to install and active the web driver. Practically no difference than your flashed 1080. (I assume this can be done because MVC proved he can boot 10.14 with non Metal supported GPU without acceleration).
Let's assume your are correct. In 10.14, any firmware upgrade require Metal supported GPU, otherwise, the OS simply doesn't run the firmware updater. Then my 1080Ti already meet the requirement (same as your flashed 1080). So, it is not a problem.
Then we have to power down the Mac and put it into firmware flashing mod. As discuss above, this part is completely OS independent, so that my GT120 will allow this process to complete (same as your flashed 1080).
At the moment, the biggest issue is if Apple actually has a "white list" of GPU, and only with those GPU can install and boot 10.14. However, up to this moment, this is not the case. I hope Apple won't change their strategy.
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Just when installing. I would assume after installation, a GT120 can be used in tandem with a metal compatible card if you need a boot screen.
This is exactly what I believe, and it's the most logical outcome as well, because boot screen is OS indenpendent, and Mac EFi display ability is OS independent.
In fact, I tested the GT120 in Windows 10. Even go to device manager to disable it, and remove the drivers. It can still display because the Mac EFI still there. And it works when no driver to take over.
Therefore, I expect this will be the case in 10.14. No driver for the GT120 at all, it's virtually transparent to the OS, but it will still display because the Mac EFI works since the cMP boot (before any OS start to load). As long as no driver take over, the Mac EFI will keep working and allow the GT120 to display.
