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Re: Loading DSDT table using 'acpi' or some memory write command?

From: Nando Eva
Subject: Re: Loading DSDT table using 'acpi' or some memory write command?
Date: Mon, 27 Feb 2017 15:13:13 +0000 (UTC)

Andrei Borzenkov wrote:
>> That's more or less what grub tries to do. We cannot really overwrite >> ACPI tables because they may be located in read-only memory, but it >> attempts to create EBDA and place new RSDP there and update EBDA >> address as well as update RSDP pointer in EFI system table. I would >> suggest trying to load something else (like Linux) and check whether >> it sees new or old table.

This user had 'acpi' also fail to replace the FACS ACPI table on Linux:

The DSDT I require is for Win10. Win10 has a registry override method to replace a DSDT but requires test signing mode to do it, along with some app restrictions/incompatibilities.

I require a pre-boot DSDT override method to overcome Win10 test signing mode AND have my required DSDT table loaded. Just need an in-memory DSDT subsitution tool to do it.

I have been able to accomplish this using MBR boot because the tools exist. For the more popular UEFI,I have yet to find a load-file-into-memory-location tool to make it possible. Only things are the multiboot file encapsulation, hexedit and write_dword. All not the right fit.

Any chance the grub-devel team can help out here with either a load-file-to-memory-location module/tool (where I need to find the address) or specifically one that does a in-memory DSDT override by overwriting the existing table? Of course, ppl with read-only memory can't use it just like I imagine would be the case with the current 'acpi' method.

Thank you,

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