updating jffs2 images

[Michael Richardson]

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I am working on an embedded box that operates as a NAS.
Since it has removeable media, it would be nice to be able to update
the system by inserting some special media (along with some jumpers
being set, naturally).

The kernel and the u-boot is no problem. They have their own flash
partitions. The / jffs image is. I don't want to do this from u-boot.

I wonder if the following might "work".
a) cp scripts, erase, dd, "reboot" to /tmp
b) mount -o ro,remount /
c) erase /dev/mtdblock/4
d) dd if=newimage of=/dev/mtdblock/4
e) /tmp/reboot

I don't see how we can pivotroot off of the flash, since /sbin/init
is loaded from it.

- --
] Michael Richardson Xelerance Corporation, Ottawa, ON | firewalls [
] mcr @ xelerance.com Now doing IPsec training, see |net architect[
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[Alan Cox]

Post by Michael Richardson
I don't see how we can pivotroot off of the flash, since /sbin/init
is loaded from it.

With advanced planning you can make it work I think.

in your init detect and mount update media
exec media/upgrade
in that pivot_root, cd, umount, dd

Since you are now running just an init off the flash media you can
umount the original root I think


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