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[PATCH] documentation: Documentation/initrd.txt
I spent a long time the other day trying to examine an initrd image on a fedora core 5 system because the initrd.txt file is apparently obsolete. Here is a patch which I hope will reduce future confusion for others. Signed-off-by: Thomas Horsley <tom.horsley@ccur.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -72,6 +72,22 @@ initrd adds the following new options:
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initrd is mounted as root, and the normal boot procedure is followed,
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with the RAM disk still mounted as root.
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Compressed cpio images
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----------------------
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Recent kernels have support for populating a ramdisk from a compressed cpio
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archive, on such systems, the creation of a ramdisk image doesn't need to
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involve special block devices or loopbacks, you merely create a directory on
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disk with the desired initrd content, cd to that directory, and run (as an
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example):
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find . | cpio --quiet -c -o | gzip -9 -n > /boot/imagefile.img
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Examining the contents of an existing image file is just as simple:
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mkdir /tmp/imagefile
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cd /tmp/imagefile
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gzip -cd /boot/imagefile.img | cpio -imd --quiet
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Installation
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------------
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