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On Thursday 24 April 2008, reader@×××××××.com wrote: |
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> So assuming I've made some mistake in grub.conf I try to boot from |
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> grub command line. |
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> |
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> root = (hd0,0) (which is /dev/sda1 in linux terms) |
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> |
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> kernel /kernel-2.6.25-r1 |
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Nope. Kernel needs a root=<device> parameter. It can't know what is your |
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root partition, that info is in fstab and fstab is on the root |
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partition.So you tell it via a parameter |
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> boot |
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> |
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> But it fails with a message saying please append a working root=?? to |
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> the boot commands. |
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expected result. see above. |
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> So reloading the install ISO I mount /mnt/gentoo/boot and edit |
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> grub.conf to say: |
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> |
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> title=kernel-2.6.25-r1 |
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> root (hd0,0) |
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> kernel /kernel-2.6.25-r1 root=/dev/sda3 |
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> |
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> That fails |
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> kernel /kernel-2.6.25-r1 root=/dev/hda3 (Thinking maybe grub |
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> does not understand sda) |
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Nothing to do with grub. It's a kernel boot parameter passed verbatim to |
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the kernel and needs valid kernel device names. |
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What's the error you get? Is (hd0,0) a separate /boot? Does it contain a |
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file called kernel-2.6.25-r1 at the top level? And you also should have |
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a "ro" kernel parameter in there |
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> That Fails |
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> |
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> kernel /kernel-2.6.25-r1 root=(hd0)/sda3 |
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> |
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> Fails |
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Won't work. (hd0) is a grub thing. You need a /dev/sda3 or similar in |
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there |
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> I've even tried: |
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> kernel /kernel-2.6.25-r1 root=(hd0,2) |
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Won't work. Same reason. |
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> And another failure... all with the same message about appending a |
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> working `root=???' |
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> |
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> I'm about out of ideas here. |
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here's a working grub.conf for illustration: |
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default 0 |
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timeout 10 |
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splashimage=(hd0,0)/grub/splash.xpm.gz |
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title Default |
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root (hd0,0) |
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kernel /vmlinuz root=/dev/sda3 ro |
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title Gentoo-2.6.25 |
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root (hd0,0) |
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kernel /vmlinuz-2.6.25-gentoo root=/dev/sda3 ro |
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Seems my setup is identical to yours: |
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/boot on /dev/sda1 aka (hd0,0) to grub |
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/ on /dev/sda3 |
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Only difference is the "ro" boot parameter, which shouldn't make a |
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difference - it's there for fsck purposes during start-up. |
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What disk driver and disks do you have? Are you 100% sure you are either |
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using the new ata driver (everything is an sd) or have scsi/sata disks? |
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If your disk is IDE with the old driver, it will be an hd and will |
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require that on the kernel line |
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-- |
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Alan McKinnon |
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alan dot mckinnon at gmail dot com |
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-- |
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gentoo-user@l.g.o mailing list |
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