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How To: EFI GFX+Audio Introduction & Tutorial
http://forum.netkas.org/index.php/topic,104.0.html
PC EFI "Pluggable Strings" Currently, PC EFI v8.0 supports what is called "pluggable strings". This can be used to add or plug data (properties) into the device tree during boot using an arbitrary "string" provided by the user.
How To: EFI GFX+Audio Introduction & Tutorial
http://forum.netkas.org/index.php?topic=104.105
Here it is.. 8800GTS 320MB from my 10.5.3, I excluded my audio (alc889a) and network strings so you can have your working GFX string to start from. Please do not forget to replace device_path PciRoot (0x0)/Pci (0x2,0x0)/Pci (0x0,0x0) with your own. Find it with: Code: ./gfxutil -f display.
How To: EFI GFX+Audio Introduction & Tutorial
http://forum.netkas.org/index.php?topic=104.30
how to check the efi version ( i have one running, but simply dont know which)? the theory of string appendices i got, but whats the effort ? will the graphic errors, that appear randomly in preview be gone ( or is it a beta drivers fact)?
11. UEFI | OpenCore 简体中文参考手册(非官方)
https://oc.skk.moe/11-uefi.html
Audio. Type: plist dict Failsafe: None Description: 配置音频后端支持，具体配置如下文所述。 音频支持为上游协议提供了一种与所选硬件和音频资源交互的方式。所有音频资源应该保存在 \EFI\OC\Resources\Audio 目录。目前支持的音频文件格式为 MP3 和 WAVE PCM。
No Audio/Sound and integrated Intel HD 40 ... - Apple
https://discussions.apple.com/thread/7745276
The Audio devices are exposed by the CSM-BIOS layer which is supported on EFI systems. If EFI is used, the BIOS layer is never invoked, hence the missing devices. Instead of hacking/modifications, why not use the available method. This is …
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