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On Tue, Mar 13, 2007 at 05:31:44PM +0000, Peter Humphrey wrote: |
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> > Not to be picky, but it's the kernel that parses that command line -- |
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> > grub just supplies it to the kernel. |
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> |
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> Are you sure? It seems to me that the "root=" parameter is to grub, to tell |
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> it where to find the kernel to which to pass the remaining arguments. |
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Yep. |
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kernel /boot/kernel-2.6.15-gentoo-r7-2006040301 root=/dev/sda2 |
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The first argument, /boot/kernel-2.6.15-gentoo-r7-2006040301, is to |
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grub, and tells it where to find the kernel. It then laods the kernel |
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(and any initrd, etc.) and passes the rest of the stuff along as the |
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command line -- it's similar to a shell command, where the shell |
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specially interprets the first component, and the rest is left to the |
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executable. |
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You can verify this by messing up your 'root=xxx' line in grub.conf and |
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rebooting. The kernel will load to the tune of lots of messages, but |
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then panic when it looks for its root fs. |
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FWIW, the same thing applies with the "magic words" used in ISOLINUX: |
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some of those are flags to the kernel, while others are interpreted by |
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the rc scripts later (the kernel makes its command line available in |
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/proc/cmdline). |
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|
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Dustin |
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-- |
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