RE: [Devel] ACPI: Also allow ACPI table adding via initrd not only overriding

[Moore, Robert]

Maybe not exactly "running", but at the very least, ACPICA must be initialized.

All of this of course depends on how early the table needs to be loaded.


> -----Original Message-----
> From: Thomas Renninger [mailto:trenn@xxxxxxx]
> Sent: Tuesday, February 18, 2014 10:53 AM
> To: Moore, Robert
> Cc: x86@xxxxxxxxxx; ck@xxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> mingo@xxxxxxxxxx; hpa@xxxxxxxxx; tglx@xxxxxxxxxxxxx; devel@xxxxxxxxxx
> Subject: Re: [Devel] ACPI: Also allow ACPI table adding via initrd not
> only overriding
> 
> On Tuesday, February 18, 2014 06:38:45 PM Moore, Robert wrote:
> > acpi_load_table won't work?
> 
> I guess not, there is:
>         /* Must acquire the interpreter lock during this operation */
>         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
> 
> So the interpreter must be running already?
> That would mean the adding can only happen much later.
> This probably would eleminate most use cases for adding arbitrary ACPI
> tables. Most tables (beside DSDT and SSDT) are needed really early,
> otherwise the info could have been added as AML as well.
> 
>     Thomas
> 
> > > -----Original Message-----
> > > From: Devel [mailto:devel-bounces@xxxxxxxxxx] On Behalf Of Thomas
> > > Renninger
> > > Sent: Tuesday, February 18, 2014 10:23 AM
> > > Cc: x86@xxxxxxxxxx; ck@xxxxxxxxxxxxxxxxxx;
> > > linux-kernel@xxxxxxxxxxxxxxx; mingo@xxxxxxxxxx; hpa@xxxxxxxxx;
> > > tglx@xxxxxxxxxxxxx; devel@xxxxxxxxxx
> > > Subject: [Devel] ACPI: Also allow ACPI table adding via initrd not
> > > only overriding
> > >
> > > The ACPICA patches have to go into separate acpica repository first.
> > > It should also be checked in acpica whether the table signature the
> > > OS likes to add already exists (from BIOS). In this case the table
> > > must not be added.
> > >
> > > Worked here by trying to override a DSDT and addind a BGRT table.
> > >
> > >      Thomas
> > >
> > > _______________________________________________
> > > Devel mailing list
> > > Devel@xxxxxxxxxx
> > > https://lists.acpica.org/mailman/listinfo/devel

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