AskDavis/Getting-Started-With-ACPI
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Mykola Grymalyuk
2020-04-30 09:40:37 -06:00
parent 37c3a68375
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Universal/vbios.md
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@@ -9,7 +9,7 @@ So this is mainly needed for GPUs that are not natively supported out of the box
* HIS
* VisionTek
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.
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.
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:
@@ -22,7 +22,6 @@ So to force a VBIOS onto the GPU, we need to find a couple things:
* ACPI Path of the GPU
* [SSDT-VBIOS]()
## Finding a suitable VBIOS
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:
@@ -30,26 +29,14 @@ To find a suitable VBIOS, we'll be using [TechPowerUps Video BIOS Collection](ht
```
Sapphire.RX560.4096.170419.rom
```
Now we have 1 small issue, our VBIOS must be padded to 65536 bytes(64KB). And our VBIOS is 262KB... *Shit*
[Insert magic software to shrink our VBIOS]
## Finding the ACPI Path of the GPU
To find the PCI path of a GPU is fairly simple, best way to find it is running Windows:
To find the PCI path of a GPU is fairly simple, best way to find it is running Windows:
* Open Device Manager
* Select Display Adapters, then right click your GPU and select Properties
@@ -59,8 +46,8 @@ To find the PCI path of a GPU is fairly simple, best way to find it is running W
![Credit to 1Revenger1 for the image](/images/Desktops/nvidia.png)
The second "ACPI" is what we care about:
```
ACPI(_SB_)#ACPI(PC02)#ACPI(BR2A)#ACPI(PEGP)#PCI(0000)#PCI(0000)
```
@@ -70,6 +57,7 @@ Now converting this to an ACPI path is quite simple, remove the `#ACPI` and `#PC
```
`_SB_.PC02.BR2A.PEGP
```
And voila! We've found our ACPI path, now that we have everything we're ready to get cooking
## Making the SSDT
@@ -80,6 +68,7 @@ To start grab our [SSDT-VBIOS]() and open it up. Here there's a couple things to
External (_SB_.PCI0, DeviceObj)
External (_SB_.PCI0.PEG0.PEGP, DeviceObj)
```
For our example, we'll change all mentions of :
* `PCI0` with `PC02`
@@ -92,14 +81,13 @@ Now that the ACPI pathing is correct, we can finally inject our VBIOS!!
So the part we want to change:
**VBIOS**:
```
"ATY,bin_image",
"ATY,bin_image",
Buffer (0x00010000)
{
// Put your VBIOS here
},
```
## [Now you're ready to compile the SSDT!](/Manual/compile.md)