From: Thomas Renninger <trenn@suse.de>
To: "Moore, Robert" <robert.moore@intel.com>
Cc: "x86@kernel.org" <x86@kernel.org>,
        "ck@conrad-kostecki.de" <ck@conrad-kostecki.de>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "mingo@redhat.com" <mingo@redhat.com>, "hpa@zytor.com" <hpa@zytor.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "devel@acpica.org" <devel@acpica.org>
Subject: Re: [Devel] ACPI: Also allow ACPI table adding via initrd not only overriding
Date: Wed, 19 Feb 2014 12:14:38 +0100
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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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