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104 lines
2.8 KiB
Markdown
104 lines
2.8 KiB
Markdown
# Injecting a compatible VBIOS
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**Work in progress**
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So this is mainly needed for GPUs that are not natively supported OOB due to their odd VBIOS, most commonly:
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* XFX
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* PowerColor
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* HIS
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* VisionTek
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Instead, these GPUs need to be flashed to a model that works best in macOS which gernally being Sapphire. This is the brand that AMD uses for making their reference cards and what Apple bases a lot of their GPU logic off of.
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One small problem, flashing VBIOSes can be a bit dangerous and can even brick a card. So for us, we'll be injecting one via an SSDT that will only load in macOS. This means 2 things:
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* Much easier to recover from, as you just remove the SSDT
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* Allows you return the GPU easily incase of hardware issues
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So to force a VBIOS onto the GPU, we need to find a couple things:
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* Suitable VBIOS for the GPU
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* ACPI Path of the GPU
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* [SSDT-VBIOS]()
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## Finding a suitable VBIOS
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To find a suitable VBIOS, we'll be using [TechPowerUps Video BIOS Collection](https://www.techpowerup.com/vgabios/) which has a full database of basically all GPU VBIOSes. For this example, we'll be creating a VBIOS SSDT for the XFX RX 560 4GB. Now lets pull up the [Sapphire RX 560 4GB](https://www.techpowerup.com/vgabios/192320/sapphire-rx560-4096-170419) and download the VBIOS linked at the bottom:
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```
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Sapphire.RX560.4096.170419.rom
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```
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Now we have 1 small issue, our VBIOS must be padded to 65536 bytes(64KB). And our VBIOS is 262KB... *Shit*
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[Insert magic software to shrink our VBIOS]
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## Finding the ACPI Path of the GPU
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To find the PCI path of a GPU is fairly simple, best way to find it is running Windows:
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* Open Device Manager
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* Select Display Adapters, then right click your GPU and select Properties
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* Under the Details Tab, search for "Loaction Paths"
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The second "ACPI" is what we care about:
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```
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ACPI(_SB_)#ACPI(PC02)#ACPI(BR2A)#ACPI(PEGP)#PCI(0000)#PCI(0000)
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```
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Now converting this to an ACPI path is quite simple, remove the `#ACPI` and `#PCI(0000)`:
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```
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`_SB_.PC02.BR2A.PEGP
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```
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And voila! We've found our ACPI path, now that we have everything we're ready to get cooking
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## Making the SSDT
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To start grab our [SSDT-VBIOS]() and open it up. Here there's a couple things to change:
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```
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External (_SB_.PCI0, DeviceObj)
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External (_SB_.PCI0.PEG0.PEGP, DeviceObj)
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```
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For our example, we'll change all mentions of :
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* `PCI0` with `PC02`
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* `PEG0` with `BR2A`
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Hint: If your ACPI path is a bit shorter than the example, this is fine. Just make sure the ACPI paths are correct to your device.
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Now that the ACPI pathing is correct, we can finally inject our VBIOS!!
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So the part we want to change:
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**VBIOS**:
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```
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"ATY,bin_image",
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Buffer (0x00010000)
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{
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// Put your VBIOS here
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},
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```
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## [Now you're ready to compile the SSDT!](/Manual/compile.md)
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