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* Samuli Suominen schrieb am 05.08.11 um 15:43 Uhr: |
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> On 08/05/2011 04:12 PM, Marc Schiffbauer wrote: |
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> > OTOH the initrd that Robin described would be a very static solution |
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> > with almost no dependencies, so if genkernel had a USE flag like |
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> > "dracut" it would be possible to build it without dracut |
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> > dependency and thus would allow for smaller systems. |
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> > |
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> To clarify, |
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> |
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> By dependencies in dracut you mean udev? |
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For example yes. |
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> And by smaller systems you mean |
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> systems without udev? |
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No. |
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> |
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> Then yes, such minimal initramfs should propably be covered in the |
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> embedded's documentation, but otherwise trying to avoid dracut is |
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> reinventing the wheel... |
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You may be right, but to my understanding such a minimalistic initrd |
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would really do nothing special. Possibly a small shell script run |
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in a static busybox would do the job, Given some required conditions |
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like having a "normal" boot device like /dev/sda is given this |
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thingy would just mount the rootfs, read some config,, then mount |
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other things like /usr and thats it. Not to forget pivot_root and |
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starting the real init of course. |
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Maybe something like: |
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<pseudo shell mode> |
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#!/bin/sh |
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mount -t proc proc /proc |
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rootfs=`sed 's/.*root=\([^ ]*\)/\$1` /proc/cmdline |
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mount $rootfs /newroot |
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while read device mnt fstype; do |
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mount -t $fstype $device $mnt |
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done < /newroot/etc/initramfs.mount |
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cd /newroot |
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pivot_root . /oldroot |
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exec chroot . /sbin/init |
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# END |
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-Marc |
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-- |
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