HP Z440 Above 4G Decoding about rebaruefi HOT 20 CLOSED

@wilsoniain yes

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Can you help me, I got this

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1, I think it can also be called MMIO, 64-bit, etc

2. You need to edit DSDT and in some cases on HEDT systems modify the IOH registers before OS loads using an EFI program. This method only works on Linux unless you can resize and assign the GPU before Windows loads using an EFI program

https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/core-i7-lga2011-3-datasheet-vol-2.pdf page 233.

It's the same registers as X79 so you can use the program made for X79 to check these registers from here #48 (comment)

Btw this method has even worked on legacy BIOS X58 system

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Any thoughts on this parameter for enabling above 4G?

0xF3D 		One Of: PCI 64-Bit Resource Allocation, VarStoreInfo (VarOffset/VarName): 0x54, VarStore: 0x1, QuestionId: 0x10, Size: 1, Min: 0x0, Max 0x1, Step: 0x0 {05 91 1C 16 1D 16 10 00 01 00 54 00 10 10 00 01 00}
0xF4E 			One Of Option: Disable, Value (8 bit): 0x0 (default) {09 07 70 08 30 00 00}
0xF55 			One Of Option: Enable, Value (8 bit): 0x1 {09 07 6F 08 00 00 01}

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Issue with setting variable value.

**grub>setup_var 0x54**
Looking for Setup variable.....
var name: Setup, var size: 12, var guid: ec87d643-eba4-4bb5 - a1-e5....etc

--> GUID does not match expected GUID, taking it nevertheless...
expected a different size of the Setup variable (got 5063 (0x13c7) bytes). Continue with care...
successfully obtained "Setup" variable from VSS (got 5063 (0x13c7) bytes).
offset 0x54 is: 0x00

var name: Setup, var size: 12, var guid: 492d16ab-4969-49ac - a1-f7....etc
expected a different size of the Setup variable (got 5063 (0x14ca) bytes). Continue with care...
successfully obtained "Setup" variable from VSS (got 5063 (0x14ca) bytes).
offset 0x54 is: 0x00

**grub>setup_var 0x54 0x1**
Looking for Setup variable.....
var name: Setup, var size: 12, var guid: ec87d643-eba4-4bb5 - a1-e5....etc

--> GUID does not match expected GUID, taking it nevertheless...
expected a different size of the Setup variable (got 5063 (0x13c7) bytes). Continue with care...
successfully obtained "Setup" variable from VSS (got 5063 (0x13c7) bytes).
offset 0x54 is: 0x00
setting offset 0x54 to 0x01
error: can't set variable using efi (error: 0x80000000000000f)

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Is this an issue with locked EFI?

Can the default value be updated in the BIOS to 0x1 along with adding FFS module? i.e. no need for setup_var method?

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@wilsoniain Is there no option like that in the regular BIOS menu ?

datasone/grub-mod-setup_var#4 seems like it's some kind of BIOS lock.

Can the default value be updated in the BIOS to 0x1 along with adding FFS module? i.e. no need for setup_var method?

I think some people know how to do this like the user Sweet_Kitten on win-raid forum, try asking there. It would be better to just expose the menu though since 4G decoding needs CSM off first.

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@xCuri0 Cant see it in the BIOS. Guess this would be the header in the BIOS?

Form: Miscellaneous Configuration, FormId: 0x9 {01 86 09 00 1A 16}

But can't see any 'Suppress' text around that form. Would that be expected to hide the menu option?

Ok, thanks for the pointer. Will try and post in win-raid about the next step.

Attached the IFRextract in case anyone wanted to look.

4G_Z440.txt

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@wilsoniain what about "BIOS Lock" under "Security Configuration" do you have that in the menu ?

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@xCuri0 Can't see BIOS lock.

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@xCuri0 .....really sorry. Just found it under performance. Not sure how I missed before.

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@wilsoniain did you manage to flash a modified BIOS to the Z440 motherboard? I also want to use ReBAR but I'm not sure about all the other changes in the HP BIOS.

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@wilsoniain Also interested if you were able to get this working, I have the same system and was hoping to get an A770 at some point.

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@wilsoniain Also interested if you were able to get this working, I have the same system and was hoping to get an A770 at some point.

Same here does anybody have any info out there?.

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Sadly, no one able to turn rez bar or overclock hp z440.

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To add more info. Using xCuri0 method to modify the bios will not work. When you use the UEFItool to open the Bios some parts will confuse the app and not read properly. When you save those parts will not save either (seen in screenshot.) Regardless I have tried and HPZ will reject the bios and not install. I believe the contents have something to do with the bios Digital signature. the only way I think will work is if you use a different Bios mod tool specifically for the HPZ series, I just don't know where to find something like that.

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@lquinones89 what about MMTool ?

And there are several others too you can try. Go to UEFITool GitHub page it lists alternatives at the bottom

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Unfortunately not. I tried MMtool then went to the super user forums to see what could be done and the end result is you would need a custom bios modder to edit it.

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