File system boot strategy
gary at mlbassoc.com
Sat Nov 15 00:40:06 EST 2003
On Fri, 2003-11-14 at 05:57, Gérard Guével wrote:
> I have a custom 8260 board with a 2.4.18 Kernel.
> I want to mount multiple file systems from a CFI compliant flash.
> The directories are distributed like this :
> / /bin /home /lib /root /sbin /usr -> cramfs to have a protected Linux
> /etc /tftpboot -> jffs2 to allow modifying services and files to
> /dev /proc /tmp /var -> ramfs to store data which can be lost.
> I want to boot with the cramfs as root file system but the UNTAR wants all
> the directories /dev /proc /tmp in the cramfs.
> Can I use multiple file systems like this ?
> Must I start with a ramfs and then mount cramfs ?
> I find many docs to mount each file system individually and to add others
> file systems mounted on /mnt
> but no example to break a standard filesystem into multiple sub file
There is nothing special about /mnt - it's just a directory (or set of
directories like /mnt/floppy, /mnt/cdrom, etc). Also, the main names
(like /etc) could be symbolic links. Here's how I might solve this:
== cramfs contents
/JFFS2 (just a mount point)
/etc => /JFFS2/etc
/tftpboot => /JFFS2/tmp
/RAMDISK (another mount point)
/tmp => /RAMDISK/tmp
/var => /RAMDISK/var
/dev and /proc are special. If you enable "devfs" and "procfs" in the
kernel they get populated automatically, all you need do is mount them.
Gary Thomas <gary at mlbassoc.com>
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