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NVRAM not working (i3-4030, HP Prodesk 260 G1, OpenCore 0.6.2, macOS 10.15.7)


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Hi all,
I have Catalina running very well on an HP Prodesk 260 G1. Specs:

  • CPU: i3-4030u
  • GPU: HD 4400
  • SSD: Adata SU800 256GB
  • 8GB DDR3
  • OpenCore 0.6.2
  • BIOS: 2.30 (latest version available), it's an American Megatrends BIOS with very few options
  • macOS 10.15.7

For some reason, "native" NVRAM is not working. When I write a test variable into NVRAM via Terminal, it is lost after rebooting. On the Dortania Emulated NVRAM page it states that usually the problem chipsets are the X99 and X299 chipsets (or B360, B365, H310, H370, Z390 w/out the SSDT-PMC).
My computer doesn't have one of these chipsets (in CPU-Z in Windows, it reads "Haswell-ULT" under chipset). Thus, I am wondering if my configuration is the problem, instead of an incompatibility. I've followed the steps in the Haswell guide, but I am not sure if there are particular values that I should change that might get NVRAM working. My config is attached should you have any specific ideas you want to check.

Just for fun, I used SSDTTime to create an SSDT-PMC for this machine. I didn't expect this to work (and it didn't)... however is it possible that a similar method could be applied to get NVRAM working on this machine? If it is relevant, I dumped the DSDT using SSDTTime in Windows and placed it in the root of my config for your viewing pleasure.

If you have any suggestions or speculation regarding NVRAM on this machine please let me know.

prodesk 260.zip

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