On Mon, Feb 27, 2017, 07:13 Vladimir 'phcoder' Serbinenko <phco...@gmail.com> wrote:
> I reproduced the bug. I'm investigating > Apparently finish_boot_services rewrites acpi tables. It's possible to workaround this, possibly by using acpi table protocol. But it's certainely not for 2.02 at this point. > > On Mon, Feb 27, 2017, 05:53 Andrei Borzenkov <arvidj...@gmail.com> wrote: > > On Mon, Feb 27, 2017 at 2:29 PM, Nando Eva <nando4...@ymail.com> wrote: > > @Andrei Borzenkov, I've confirmed that any of the following do not alter > the > > Win10 DSDT table across numerous Macbooks and my Dell E6540. > > > > acpi dsdt.aml > > acpi --load-only dsdt dsdt.aml > > acpi -2 dsdt.aml > > > > Followed by: > > chainloader /efi/Microsoft/Boot/bootmgfw.efi > > > > Clover has a DSDT override function and using it works on my Dell E6540. > > However it does it by writing to the UEFI firmware volume, which for > > Macbooks, has had one test instance of bricking the system. > > > > Any chance of a simple 'load_dsdt [file]' command that acquires the > > in-memory DSDT table address, checks it's size, then overwrites it with > the > > file name specified if it's the same size or smaller? > > > > 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. > > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > https://lists.gnu.org/mailman/listinfo/grub-devel > >
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