linux-kernel - Re: AW: AW: [PATCH] x86: HPET force enable for Soekris net6501

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Message-ID: <4233973.R9Tf84J4Ne@skinner>
Date:	Mon, 17 Feb 2014 20:25:18 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Conrad Kostecki <ck@...rad-kostecki.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, devel@...ica.org
Subject: Re: AW: AW: [PATCH] x86: HPET force enable for Soekris net6501

On Monday, February 17, 2014 10:47:50 AM H. Peter Anvin wrote:
> On 02/17/2014 10:23 AM, Thomas Renninger wrote:
> > Easiest I can think of instead of trying to modify RSDP or similar, is
> > to still pass the tables via unzipped, glued cpio which the kernel
> > can access early. The same way it is done for current ACPI table
> > overriding
> > and early microcode passing.
> 
> We shouldn't *need* an RSDP and RSDT/XSDT, though, since all they are
> are pointers to the actual tables.  Rather than hacking around it we
> should probably just fix the fundamental problem.

That is what I described.
If something similar what I wrote gets implemented, you can simply
add ACPI tables to initrd as described here:
Documentation/acpi/initrd_table_override.txt
and if BIOS already provides them they get overridden, otherwise
they get added.

     Thomas
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