Not working on Memphis2-S

[whatdahopper]

System

• Motherboard: Memphis2-S (HP Pavilion 550-153w)
• BIOS Version: A0.17
• GPU: NVIDIA GTX 1050 Ti 4GB (yes, I'm well aware my GPU is not officially ReBar supported.)
• CSM is turned off
• 4G decoding is enabled
• UEFIPatch is applied (see Using UEFIPatch for more information). On some motherboards DSDT Patching is also needed
• I have read Common issues (and fixes)

Description

I did everything correctly, enabled 4G decoding, etc. But attempting to turn on the ReBar DXE via ReBarStatus does not work (returns GetLastError: 5). Checking the wiki says I need the NVRAM whitelist patch, but the problem is that none of those whitelist patches work on my system, so I attempted to make my own NVRAM whitelist by patching VarNotInEfiGlobalVarList to return false. Unfortunately, this still did not work. Any ideas?

I have attached the patch I created (may or may not work), but I doubt it's correct.

# NvramSmi NVRAM whitelist unlock for Memphis2-S and potentially other motherboards (patches VarNotInEfiGlobalVarList, by @kaitlyndotmoe)
842A454A-75E5-408B-8B1C-36420E4E3F21 10 P:48895C240848896C24104889742418574155:48895C240848896C2410488974241830C0C3

[xCuri0]

@kaitlyndotmoe The NVRAM patches are the only ones I didn't develop or assist with so I'm not sure how they work. But you can try replacing one of the entries in the whitelist that are non-critical with name ReBarState GUID a3c5b77a-c88f-4a93-bf1c-4a92a32c65ce. To find the GUID you could look in the NVRAM variables list from dump opened in UEFITool NE or Linux efivars

[whatdahopper]

@kaitlyndotmoe The NVRAM patches are the only ones I didn't develop or assist with so I'm not sure how they work. But you can try replacing one of the entries in the whitelist that are non-critical with name ReBarState GUID a3c5b77a-c88f-4a93-bf1c-4a92a32c65ce. To find the GUID you could look in the NVRAM variables list from dump opened in UEFITool NE or Linux efivars

So, I actually took a Z97-PRO ASUS BIOS and patched that (as it's NVRAM whitelist can be patched) and took it's NvramSmi and replaced my NvramSmi with that one, and sure enough, it worked!

But now there is another problem, ReBar isn't detected by GPU-Z. I'm starting to think this BIOS lacks proper 4G decoding despite the option being enabled?

[xCuri0]

@kaitlyndotmoe it's not going to be detected without a rebar capable gpu

[whatdahopper]

@kaitlyndotmoe it's not going to be detected without a rebar capable gpu

Understood, thanks then!

[xCuri0]

Have you confirmed that nvram write works and they stay across power cycles ?

[whatdahopper]

Have you confirmed that nvram write works and they stay across power cycles ?

As far as I'm aware, it works perfectly fine. But I'll check that and report back if it doesn't.

[whatdahopper]

Have you confirmed that nvram write works and they stay across power cycles ?

Update: it seems to persist and stay across power cycles.

[MaxAbarcaC]

@kaitlyndotmoe The NVRAM patches are the only ones I didn't develop or assist with so I'm not sure how they work. But you can try replacing one of the entries in the whitelist that are non-critical with name ReBarState GUID a3c5b77a-c88f-4a93-bf1c-4a92a32c65ce. To find the GUID you could look in the NVRAM variables list from dump opened in UEFITool NE or Linux efivars

So, I actually took a Z97-PRO ASUS BIOS and patched that (as it's NVRAM whitelist can be patched) and took it's NvramSmi and replaced my NvramSmi with that one, and sure enough, it worked!

But now there is another problem, ReBar isn't detected by GPU-Z. I'm starting to think this BIOS lacks proper 4G decoding despite the option being enabled?

Hi, @kaitlyndotmoe, can you tell me what was the BIOS version you took? I'm afraid I'm facing the same issue than you with an ASUS Z97-AR 3503

[Icedrow]

Can you please add more details? I have the same shitty hp motherboard and what you did is remarkable