I'm trying to figure out how exactly the c3000 (normally) boots.
As far as I know, the root filesystem is on mtd2, the home is on mtd3, /etc is a symlink to /home/etc, and the original (?) etc is in /root/etc
How can the system boot if (initially) /home (and therefore, /etc) isn't mounted? How does the system (init?) know that /root/etc is to be used?
I suspect that /root isn't related to root's homedirectory (as on many linux systems) but that it's an alternative, temporary rootfilesystem, somehow. I just can't find where the switch takes place to the normal environment
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Ok, I figured it out myself eventually - here's an explanation for anyone who's interested.
Upon initial boot, /etc is a link to /home/etc. /home isn't mounted at this point, and contains a symlink /home/etc to /root/etc. So effectively, /etc is /root/etc.
In /root/etc, rc.rofilesys does the interesting stuff, such as mounting /dev/mtdblock3 as /home and, eventually, starting the pcmcia system to detect and mount the microdrive.
Once /home is mounted from /dev/mtdblock3 and rc.rofilesys is finished, execution returns to rc.sysinit, which will do the appropriate runlevel stuff in rc5.d. By now, this will be a new, 'filled' directory (because home, and therefore the new /etc, was mounted)
