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    SubjectError message for invalid initramfs cpio format?
    On Mon, Jan 23, 2006 at 09:02:16PM -0500, you [Phillip Susi] wrote:
    > Ville Herva wrote:
    > >PS: Speaking of debugging failing initrd init scripts; it would be nice if
    > >the kernel gave an error message on wrong initrd format rather than
    > >silently
    > >failing... Yes, I forgot to make the cpio with the "-H newc" option :-/.
    > >
    >
    > LOL, yea, that one got me too when I was first getting back into linux a
    > few months ago and had to customize my initramfs to include dmraid to
    > recognize my hardware fakeraid raid0. Then I discovered the mkinitramfs
    > utility which makes things much nicer ;)

    Sure does, that's what I first used, too. But then I had to hack with the
    init script and it seemed quicker to

    gzip -d < /boot/initrd-2.6.15.1.img | cpio --extract --verbose --make-directories --no-absolute-filenames
    vi init
    ...
    find . | cpio -H newc --create --verbose | gzip -9 > /boot/initrd-2.6.15.1.img

    It seems do_header() in init/initramfs.c checks for the "070701" magic (that
    is specific to the newc format [1]), and populate_rootfs() should then
    panic() with "no cpio magic" error message, but I'm fairly sure I didn't see
    an error about wrong initramfs format when booting with an initrd made with
    cpio without the -H newc option.

    This is what I see:

    RAMDISK: Couldn't find valid RAM disk starting at 0.
    VFS: Cannot open root device "LABEL=/" or unknown-block(0,0)
    Please append correct "root=" boot option
    Kernel panic - not syncing: VFS: Unable to mount root fs on
    unknown-block(0,0)

    seems the "no cpio magic" message is somehow lost. It would be useful.


    -- v --

    v@iki.fi



    [1] "The new (SVR4) portable format, which supports file systems having more
    than 65536 i-nodes."
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