On 12.11.2010 13:34, Christophe Aeschlimann wrote:
Hi,
I'm working on a custom arm embedded system and I would like to
implement a "live" system update. The system is running from NAND flash
and has two mtd partitions one to store the kernel and another one to
store the filesystem (jffs2/mtd). To be able to gracefully update the
file-system from a running state I would like to:
- kill all the running processes
- remount file system as read only
- create a small rootfs in /var/tmp/update/ (in ram) with the required
tools (mainly erase/write flash and reboot)
- copy the updated filesystem (fs.jffs2) to /var/tmp/update/
- chroot in my small rootfs and execute
o flash_eraseall /dev/mtdX
o nandwrite -p /dev/mtdX fs.jffs2
o reboot
The problem I have is with recreating the /dev inside my mini rootfs.
I'm using udev and I don't know how to instruct udev to mirror the
content of /dev in /var/tmp/update/dev/.
Or maybe I can just create the devices (mtdX) I need using mknod ?
Would that work (I'll be trying) ?
Maybe I'll answer myself here but would just copying the devices
from /dev/ to /var/tmp/update/dev/ work ?
(I'll keep you informed if that worked)
Thanks !
Best regards,
--
Christophe Aeschlimann
Embedded Software Engineer
Advanced Communications Networks S.A.
Rue du Puits-Godet 8a
2000 Neuchâtel, Switzerland
Tél. +41 32 724 74 31
[email protected]
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