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    SubjectRe: [PATCH] Kdump documentation update for 2.6.20
    On Tue, Jan 09, 2007 at 08:17:08PM +0530, Vivek Goyal wrote:
    > On Tue, Jan 09, 2007 at 10:18:47AM +0900, Horms wrote:
    > > > Download and build the system and dump-capture kernels
    > > > ------------------------------------------------------
    > > > +There are two possible methods of using Kdump.
    > > > +
    > > > + 1) Build a separate custom dump-capture kernel for capturing the
    > > > + kernel core dump.
    > > > +
    > > > + 2) Use system kernel itself as dump-capture kernel and there is
    > > > + no need to build a separate dump-capture kernel. (Only for
    > > > + i386 architecture kernel version 2.6.20 onwards)
    > > > +
    > > > +For i386, second method is recommended, as it takes away the need to build
    > > > +additional kernel.
    > >
    > > I think that the above description is a little misleading, and quite
    > > i386 centric. The question is not weather or not you are using the
    > > system kernel, but rather, what options are needed for the crash kernel.
    > >
    > Hi Horms,
    >
    > Thanks for going through the update. Actually I never knew that kdump
    > IA64 support is mainline now. I thought it is still in Tony's tree. And
    > we never had IA64 specific documentation in kdump.txt file and that's another
    > reason that discussion became more i386 centric when it came to relocatable
    > kernels.

    It wasn't that long ago it was merged, but its there now :)

    > > In terms of a non-relocatable kernel, then the boot and crash kernels
    > > need to be separate.
    > >
    > > But in the case of a relocatable kernel, then the boot and crash kernels
    > > may be the same, or they may be separate. Depending on just what
    > > the end-user wants in each kernel.
    > >
    > > On ia64 there is no CONFIG_RELOCATABLE option, but the kernel is always
    > > relocatable anyway. That is, you can use the same kernel before and
    > > after crash (though I am not sure that I have tested this).
    > >
    >
    > I have tried to re-arrange the documentation based on some of your
    > recommendations. I have also left couple of sections empty which are
    > ia64 specific. I don't have an IA64 machine and I don't know how exactly
    > it is used on IA64. Can you please have a quick look at the patch and
    > also fill IA64 specific details where appropriate.

    Sure, will do.

    > Hopefully, this time documentation is clearer.
    >
    >
    > Mohan, Can you please check the correctness of ppc64 specific details.
    >
    > > > + --append="root=<root-dev> init 1 irqpoll maxcpus=1"
    > > > +
    > > > +If you are using a relocatable kernel (method 2), then use
    > > > +following command.
    > > >
    > > > + kexec -p <bzImage-of-relocatable-kernel> \
    > > > + --initrd=<initrd-for-relocatable-kernel> \
    > > > + --append="root=<root-dev> init 1 irqpoll maxcpus=1"
    > >
    > > --args-linux is not needed on ia64, but its kernel is relocatable.
    > > I think the important point is that if you are using a bzImage,
    > > then you need --args-linux, and basically at this point that
    > > means an i386 (or x86_64) relocatable bzImage.
    > >
    >
    > I am hoping it --args-linux will be required while loading vmlinux on
    > IA64? Because this is ELF file specific option. And this interface should
    > be common across all the architectures.
    >
    > > Then again, I could be wrong, I'm not sure that I understand
    > > --args-linux, I just know that I'm not using it :)

    I will take a look into this.

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

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