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

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Message-ID: <alpine.DEB.2.02.1402191356320.4468@ionos.tec.linutronix.de>
Date:	Wed, 19 Feb 2014 14:03:00 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Thomas Renninger <trenn@...e.de>
cc:	"Moore, Robert" <robert.moore@...el.com>,
	"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>,
	"devel@...ica.org" <devel@...ica.org>
Subject: Re: [Devel] ACPI: Also allow ACPI table adding via initrd not only
 overriding

On Wed, 19 Feb 2014, Thomas Renninger wrote:

> 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.

The case is a BIOS with complete lack of ACPI tables. So we have no
data about IOAPIC, HPET and other stuff.

The current acpi_initrd_override() call is sufficient, because its
called before acpi_boot_table_init(), which is the first function
accessing any of the tables.

Thanks,

	tglx

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