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From: "H. Peter Anvin" <hpa@zytor.com>
To: Thomas Renninger <trenn@suse.de>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org, devel@acpica.org,
	mingo@redhat.com, ck@conrad-kostecki.de, tglx@linutronix.de,
	rjw@rjwysocki.net
Subject: Re: [PATCH 1/4] ACPI: Provide support for ACPI table adding via OS
Date: Tue, 18 Feb 2014 12:51:07 -0800	[thread overview]
Message-ID: <5303C7BB.4020803@zytor.com> (raw)
In-Reply-To: <1568883.1dLS7uNIC1@skinner>

On 02/18/2014 10:44 AM, Thomas Renninger wrote:
> 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.

Since adding SSDTs is one of the things I really can imagine one would
do, I think we need to figure out how to do that.  I would think that
overriding would be the exception case.

	-hpa


  reply	other threads:[~2014-02-18 20:53 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-14 10:23 [PATCH] x86: HPET force enable for Soekris net6501 Conrad Kostecki
2014-02-14 17:46 ` H. Peter Anvin
2014-02-14 18:06   ` AW: " Conrad Kostecki
2014-02-14 18:08     ` H. Peter Anvin
2014-02-14 18:13       ` AW: " Conrad Kostecki
2014-02-14 18:16         ` H. Peter Anvin
2014-02-14 18:21           ` Thomas Gleixner
2014-02-14 18:22             ` H. Peter Anvin
2014-02-14 18:38               ` Thomas Gleixner
2014-02-14 18:39                 ` H. Peter Anvin
2014-02-14 19:15                   ` Thomas Gleixner
2014-02-14 19:26                     ` H. Peter Anvin
2014-02-14 19:59                       ` Thomas Gleixner
2014-02-14 20:06                         ` H. Peter Anvin
2014-02-14 21:16                           ` Thomas Gleixner
2014-02-14 21:18                             ` H. Peter Anvin
2014-02-14 21:47                               ` Thomas Gleixner
2014-02-14 21:48                                 ` H. Peter Anvin
2014-02-17 16:28                             ` Thomas Renninger
2014-02-17 17:19                               ` H. Peter Anvin
2014-02-17 18:23                                 ` Thomas Renninger
2014-02-17 18:47                                   ` H. Peter Anvin
2014-02-17 19:25                                     ` Thomas Renninger
2014-02-17 19:40                                       ` H. Peter Anvin
2014-02-18 18:22                                         ` ACPI: Also allow ACPI table adding via initrd not only overriding Thomas Renninger
2014-02-18 18:22                                           ` [PATCH 1/4] ACPI: Provide support for ACPI table adding via OS Thomas Renninger
2014-02-18 18:27                                             ` H. Peter Anvin
2014-02-18 18:44                                               ` Thomas Renninger
2014-02-18 20:51                                                 ` H. Peter Anvin [this message]
2014-02-19 11:22                                                   ` Thomas Renninger
2014-02-21  7:24                                                     ` [Devel] " Zheng, Lv
2014-02-21  7:28                                                 ` Zheng, Lv
2014-02-18 18:22                                           ` [PATCH 2/4] ACPICA: Introduce new acpi_os_physical_table_add OS callback Thomas Renninger
2014-02-18 18:22                                           ` [PATCH 3/4] ACPICA: Add BGRT signature to known signatures Thomas Renninger
2014-02-18 18:22                                           ` [PATCH 4/4] ACPI: Add new table signatures that can be overridden/added Thomas Renninger
2014-02-18 18:38                                           ` [Devel] ACPI: Also allow ACPI table adding via initrd not only overriding Moore, Robert
2014-02-18 18:52                                             ` Thomas Renninger
2014-02-18 19:59                                               ` Moore, Robert
2014-02-19 11:14                                                 ` Thomas Renninger
2014-02-19 13:03                                                   ` Thomas Gleixner
2014-02-14 18:28           ` AW: AW: AW: [PATCH] x86: HPET force enable for Soekris net6501 Conrad Kostecki
2014-09-09 13:56             ` Eric Sesterhenn
2014-09-09 14:54               ` Thomas Gleixner
2014-09-09 15:26                 ` H. Peter Anvin
2014-09-09 15:41                   ` Thomas Gleixner
2014-09-12  9:41                   ` Eric Sesterhenn
2014-09-12 10:37                     ` Thomas Gleixner
2014-09-12 11:06                       ` [PATCH] x86: HPET force enable for e6xx based systems Eric Sesterhenn
2014-09-16  0:58                         ` [tip:x86/platform] " tip-bot for Peter Neubauer
     [not found] <1393608241-31037-1-git-send-email-trenn@suse.de>
2014-02-28 17:23 ` [PATCH 1/4] ACPI: Provide support for ACPI table adding via OS Thomas Renninger
2014-02-28 17:27   ` Thomas Renninger

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