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    SubjectRe: [RFC] x86 ELF bootable kernels/Linux booting Linux/LinuxBIOS
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    Andrew Morton <akpm@zip.com.au> writes:

    > On uniprocessor, you can type `sudo monte /boot/bzImage'
    > and get to `decompressing linux' in two seconds flat. (Having
    > journalling filesystems rather helps with this trick). It's
    > lovely.

    Hmm. That sounds a little slow to me. That is about what I get
    with LinuxBIOS from when I flip the power switch, and network boot..
    But that is enough enjoyment of speed.

    > > The biggest issue I have had is
    > > with the kernel not properly shutting down devices.
    >
    > Monte just disables all busmastering on the PCI devices...

    That might be a useful addition, as it will probably work for most
    devices. However it doesn't handle non-PCI devices. And it doesn't
    handle strange devices that need a different shutdown.

    With module_exit() I am quiet certain the linux driver can find the
    device and set it up again, because otherwise you couldn't insert,
    remove, and reinsert the code as a module.

    > module_exit() routines for statically-linked drivers often
    > don't exist - they're in .text.exit. I guess you can just
    > move .text.exit out of the /DISCARD/ section in vmlinux.lds.
    > Also, take a look at user-mode-linux's do_exitcalls()
    > implementation - there's no clear reason why that shouldn't
    > be mainstreamed.

    I like the other suggestion of extending the Hot-plug infrastructure.
    In that case I just need to figure out how to logically Hot-unplug all
    the devices in the system. That may be better than a
    do_exitcalls()... As it automatically gets the discrimination right.

    > It would be convenient to be able to directly boot a bzImage,
    > but I guess elf is workable.

    Well that is directly booting vmlinux, and it doesn't lock you into
    booting the linux kernel which is very important to me.

    > Great work, and thanks! I look forward to 2-second SMP
    > reboots.

    I'll love to hear how it goes.

    Eric
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