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

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Message-ID: <52FE7738.6040009@zytor.com>
Date:	Fri, 14 Feb 2014 12:06:16 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	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>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: AW: AW: [PATCH] x86: HPET force enable for Soekris net6501

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.

Thomas, Rafael, do you have any insights?

	-hpa


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