Subject: Re: [RFC] Include ACPI DSDT from INITRD patch into mainline
From: Arjan van de Ven <arjan@infradead.org>
Reply-To: arjan@infradead.org
To: Ben Collins <ben.collins@ubuntu.com>
Cc: Alan <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org,
       Eric Piel <eric.piel@tremplin-utc>
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Organization: Intel International BV
Date: Fri, 01 Dec 2006 22:49:06 +0100
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On Fri, 2006-12-01 at 16:01 -0500, Ben Collins wrote:
> On Fri, 2006-12-01 at 20:45 +0100, Arjan van de Ven wrote:
> > On Fri, 2006-12-01 at 14:35 -0500, Ben Collins wrote:
> > > What about the point that userspace (udev, and such) is not available
> > > when DSDT loading needs to occur? Init hasn't even started at that
> > > point.
> > 
> > that's a moot point; you need to load firmware from the initramfs ANYWAY
> > for things like qlogic and others...
> 
> I don't see how that relates. The DSDT needs to be loaded even before
> driver initialization begins. 

in fact it needs to be loaded even before the ACPI engine starts
executing, otherwise you're hot-replacing code underneath a live
system...  at which point you can do this same feature in another way :)
there already is a feature that builds a dsdt into the kernel image, all
a distro would need is a bit of objcopy magic to build the right one
into the vmlinuz...


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