linux-kernel - Re: [RFC PATCH] Exporting extra tables for machines without /dev/mem

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Date:	Thu, 06 Aug 2015 01:38:17 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Al Stone <ahs3@...hat.com>, Lv Zheng <lv.zheng@...el.com>
Cc:	Graeme Gregory <graeme.gregory@...aro.org>, lenb@...nel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] Exporting extra tables for machines without /dev/mem

On Wednesday, August 05, 2015 02:25:06 PM Al Stone wrote:
> On 07/21/2015 07:31 AM, Graeme Gregory wrote:
> > Hi,
> > 
> > I thought I would send this patch as an RFC. It is something I did when
> > another linaro engineer was modifying acpica-tools to not require /dev/mem.
> > 
> > It exports the 3 tables that are not currenly exported in sysfs.
> > 
> > Currently I do not think there is any user of this because acpica-tools can
> > can recover the information in the other tables without these three being
> > exported, fwts also works fine without the patch so the only use case I have
> > is the vague "might be useful for debug"
> 
> Right -- and I personally would like to have that debug use case.  AFAICT,
> the RSDP and RSDT/XSDT are recreated by acpidump; i.e., based on knowledge
> of the mapped tables, acpidump builds what it believes these tables should
> look like.  But, the /dev/mem mappings would give me what ACPI is actually
> using (what was directly passed to the kernel).  Should there be a bug in
> table mapping or ACPI startup, this info might help.

If my memory serves me right, Lv has been doing something in that area.  Lv?

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