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read only root file system

Hi friends,
Any one has any Idea on , how to create root file system "/" as Read-only .
what are all needed...for that..

what i have triend yet now..is
"
"

Quote:

/home/ups -- Moved and made Softlink -- /mnt/hda5/ups (moved to second partition hda2)
/var -- Moved and made Softlink -- /mnt/hda5/var (moved to second partition hda2)
/etc -- Moved and made Softlink -- /mnt/hda5/etc (moved to second partition hda2)
/tmp -- Moved and made Softlink -- /mnt/hda5/tmp (moved to second partition hda2)
/root -- Moved and made Softlink -- /mnt/hda5/etc (moved to second partition hda2)

/mnt/hda5/ this one i mounted before it self..in "mountfs" script...

I can able to login but i cant able to communicate with /dev/ttyS0 devices...and TCPIP programming also failing...
any inputs from you guys and girls,

thanks in advance,
santhosh kumar.B

I think it is not possible because /dev needed to be writable. Every time you plug a usb device, change the partition table for any disk, new entries are created in /dev by hal, hotplug, kudzu, whatever.

What are you trying to accomplish ?

I want to communicate with with /dev/ttyS0 and sockets..and my root file system as read only..
so...provide inputs from u
Santhosh