linux-kernel - Re: [PATCH 1/2] boot: increase stack size for kernel boot loader decompressor -- payload

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Date:	Thu, 10 Apr 2008 14:15:31 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Alexander van Heukelum" <heukelum@...lshack.com>,
	"Mike Travis" <travis@....com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, heukelum@...tmail.fm
Subject: Re: [PATCH 1/2] boot: increase stack size for kernel boot loader decompressor -- payload_length

On Thu, Apr 10, 2008 at 1:37 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Yinghai Lu wrote:
>
> >
> > >
> > >  FWIIW, i've been booting allyesconfig bzImages for a long time (with
> > >  only minimal amount of drivers disabled - mostly old ISA ones that
> > >  assume the presence of the real hardware), and they boot and work fine
> > >  on both 32-bit and 64-bit typical whitebox PCs. That means huge
> bzImages
> > >  that decompresses into a ~41 MB kernel image. I'd expect that to be a
> > >  rather severe test of the decompressor.
> > >
> >
> > payload_offset and payload_length in arch/x86/boot/head.S
> > seems to be used by bootloader  to seat the bzImage.  or just use size
> > of bzImage
> >
> >
>
>  payload_offset/payload_length are used by loaders for nonstandard platform
> loaders which don't actually load a bzImage.
>
>
>
> > long term, should add one field after payload_length like
> > payload_unzip_length to make bootloader or kexec what buffer size
> > needed.
> >
>
>  You can look at the payload headers for that.
>

arch/x86/boot/compressed/head_64.S?

YH
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