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

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Date:	Mon, 17 Feb 2014 09:19:03 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Thomas Renninger <trenn@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	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

What I gather is that they want to add tables where there are none, and that the ACPI code doesn't play along because there is no RSDP nor any RSDT/XSDT.

On February 17, 2014 8:28:05 AM PST, Thomas Renninger <trenn@...e.de> wrote:
>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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