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

From: Yinghai Lu
Date: Thu Apr 10 2008 - 17:15:49 EST


On Thu, Apr 10, 2008 at 1:37 PM, H. Peter Anvin <hpa@xxxxxxxxx> 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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