Mailinglist Archive: opensuse-kernel (65 mails)

[Jeff Mahoney <jeffm@xxxxxxxx>]

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On 01/11/2010 08:24 PM, mail ignored wrote:
> On Mon, Jan 11, 2010 at 5:08 PM, Jan Engelhardt <jengelh@xxxxxxxxxx> wrote:
> > arch            type            name
> > x86-*           compressed      bzImage
> > x86-xen         compressed      vmlinuz
>
> Is it possible to *convert* a vmlinuz (gzip compressed) to a bzImage?
> I believe I could rebuild the kernel, specifying a different image
> type ... looking for a simpler step to test.  My goal is to 'feed' a
> -xen bzImage to the Dom0's PVGRUB bootloader (hosted, so I can't get
> to it), and see if it stops complaining ...
>
> Some very recent PVGRUB patches seem to address problems with
> LZMA/BZIP2 decompression; I've found nothing, yet, re: GZIP itself,
> though.
>
> Given your info above, the fact that the -xen vmlinuz *is* provided as
> gzip compressed, and checking,
>
> /usr/src/linux-2.6.31.8-0.1/arch/x86  > egrep "LZMA|GZIP|BZIP" Kconfig
>         select HAVE_KERNEL_GZIP
>         select HAVE_KERNEL_BZIP2 if !XEN
>         select HAVE_KERNEL_LZMA if !XEN
>
> it seems that BZIP & LZMA compression are neither available nor turned
> on for XEN case.

It's possible, but not without building most of the kernel again to get
setup.bin and the decompression helper. Then it's some manual hackery. I
don't really think that's the best place to start though. I'm not sure
which order pvgrub tries kernel types, but it may be that it's  decided
that it's not a compressed vmlinux already.

- -Jeff

- -- 
Jeff Mahoney
SuSE Labs
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