linux-kernel - RE: [Devel] [PATCH 1/4] ACPI: Provide support for ACPI table adding via OS

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Message-ID: <1AE640813FDE7649BE1B193DEA596E88024B23DE@SHSMSX101.ccr.corp.intel.com>
Date:	Fri, 21 Feb 2014 07:28:02 +0000
From:	"Zheng, Lv" <lv.zheng@...el.com>
To:	Thomas Renninger <trenn@...e.de>, "H. Peter Anvin" <hpa@...or.com>
CC:	"x86@...nel.org" <x86@...nel.org>,
	"ck@...rad-kostecki.de" <ck@...rad-kostecki.de>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"devel@...ica.org" <devel@...ica.org>
Subject: RE: [Devel] [PATCH 1/4] ACPI: Provide support for ACPI table adding
	via OS

Hi, Thomas

> From: Devel [mailto:devel-bounces@...ica.org] On Behalf Of Thomas Renninger
> Sent: Wednesday, February 19, 2014 2:44 AM
> 
> On Tuesday, February 18, 2014 10:27:23 AM H. Peter Anvin wrote:
> > Why can't you add SSDTs? It would be particularly useful.
> 
> There are 2 ways how ACPI tables get added:
>    - Via pointer from a root table (XSDT or RSDT iirc)
>    - Via load statement inside of ACPI context when ACPI BIOS
>      code gets executed (iirc the physical address is passed).
> 
> The latter is only for SSDTs.
> The problem is that you if you add an SSDT early, it might
> have been intended for overriding when an SSDT gets dynamically
> loaded later when the system is up which is particular useful as
> well if you want to debug this specific BIOS table.
> 
> This could be workarounded via a boot param:
> acpi=allow_ssdt_adding
> But this is not nice. Maybe someone has a more elegant idea.
> Something could still be added if someone is really needing this.

I'm not sure if you are talking about the issue that:
If a system booted using customized DSDT embedded with SSDT, it also requires dynamic SSDT loading be prevented in ACPICA.

Thanks and best regards
-Lv

> 
>      Thomas
> _______________________________________________
> Devel mailing list
> Devel@...ica.org
> https://lists.acpica.org/mailman/listinfo/devel
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