linux-kernel - Re: [Devel] ACPI: Also allow ACPI table adding via initrd not only overriding

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Message-ID: <2779111.V9OOdv2fEJ@skinner>
Date:	Wed, 19 Feb 2014 12:14:38 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	"Moore, Robert" <robert.moore@...el.com>
Cc:	"x86@...nel.org" <x86@...nel.org>,
	"ck@...rad-kostecki.de" <ck@...rad-kostecki.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"devel@...ica.org" <devel@...ica.org>
Subject: Re: [Devel] ACPI: Also allow ACPI table adding via initrd not only overriding

On Tuesday, February 18, 2014 07:59:17 PM Moore, Robert wrote:
> 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.

I'd say as early as possible.
Not sure about Thomas' use case.
I expect most of the extra tables are needed before ACPICA gets
initialized otherwise it could have been specified to put the info
into DSDT/SSDT via ASL.
Sooner or later people will hit the "I need it earlier" limit and
patch:
ACPICA: Introduce new acpi_os_physical_table_add OS callback
shows that it can be done early and that it integrates nicely
with only some additional lines.

   Thomas
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