linux-kernel - Re: [Fastboot] [PATCH] free initrds boot option

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Message-ID: <20070208123537.GB7304@verge.net.au>
Date:	Thu, 8 Feb 2007 21:35:39 +0900
From:	Horms <horms@...ge.net.au>
To:	Michael Neuling <mikey@...ling.org>
Cc:	Andrew Morton <akpm@...l.org>, Al Viro <viro@....linux.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>, fastboot@...ts.osdl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Fastboot] [PATCH] free initrds boot option

On Wed, Dec 13, 2006 at 10:35:08AM +0900, Horms wrote:
> On Fri, Dec 08, 2006 at 10:32:15AM +1100, Michael Neuling wrote:
> > > >Is there a kexec-tools patch too? How does second kernel know about
> > > >the location of the first kernel's initrd to be reused?
> > > >  
> > > >
> > > kexec-tools has to be modified to pass the first kernel initrd. On 
> > > powerpc, initrd locations are exported using device-tree. At present, 
> > > kexec-tool ignores the first kernel initrd property values and creates 
> > > new initrd properties if the user passes '--initrd' option to the kexec 
> > > command. So, will be an issue unless first kernel device-tree is passed 
> > > as buffer.
> > 
> > We've been using the --devicetreeblob kexec-tools option available for
> > POWERPC.  This enables you to setup the device tree (and hence, the
> > initrd points) as you like.
> > 
> > I'm happy to put together a patch for kexec-tools. 
> 
> Please do. And please cc me on a copy that applies against kexec-tools-testing.
> 
> > Unfortunately this
> > is arch specific.  A quick look through the x86, ia64, s390 and ppc64
> > code shows the --initrd option for all these just reads the specified
> > initrd file, pushes it out to memory and uses the base and size pointers
> > to setup the next boot.  We'd obviously just skip to the last stage.
> > 
> > So what's the kexec-tools option called?  --initrd-location <base> <size>?
> 
> That sounds fine to me. I think its ok to make it arch specific for
> starters and then move it out to generic code later. That said, if
> you're feeling particularly entergetic, feel free to do the generic
> stuff now and just add null stubs for the other architectures (does
> that makes sense?).

Did anything ever come of this?

-- 
Horms
  H: http://www.vergenet.net/~horms/
  W: http://www.valinux.co.jp/en/

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