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

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Date:	Mon, 17 Feb 2014 17:28:05 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	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>
Subject: Re: AW: AW: [PATCH] x86: HPET force enable for Soekris net6501

On Friday, February 14, 2014 10:16:41 PM Thomas Gleixner wrote:
> On Fri, 14 Feb 2014, H. Peter Anvin wrote:
> > On 02/14/2014 11:59 AM, Thomas Gleixner wrote:
> > > On Fri, 14 Feb 2014, H. Peter Anvin wrote:
> > >> On 02/14/2014 11:15 AM, Thomas Gleixner wrote:
> > >>> I'm fine with ACPI tables if we can provide simple means for embedded
> > >>> users to load one via grub or just attach it to the kernel image.
> > >> 
> > >> That already exists, see Documentation/acpi/initrd_table_override.txt.
> > > 
> > > That requires, that you have already ACPI tables.
> > > 
> > > ACPI_SIG_RSDP cannot be overridden and that's the base table you need
> > > to get ACPI going in the first place. So we need support for that and
> > > probably for storing the tables at some non canonical place.
> > 
> > Well, the RSDP and RSDT/XSDT are nothing but pointers to other tables,
> > so if explicitly overridden I'm not sure if one actually would need
> > them.  That doesn't mean our current code will work without them, though.
> 
> I tried once to overload all of the tables, but failed miserably in
> the ACPI dungeon. RSDP was the major pain point IIRC.

What exactly do you try to achieve?
I cannot imagine a use-case where RSDP  and XSDT overriding would help you.

Have you tried the current mechanism to override tables?
What is missing and for what do you need it for?

I need more context, maybe I can help then.

   Thomas
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