"fake mount"

[James Muir]

Hello! I'm following the procedures described in the LFS 6.0 book and 
have a few questions I'd like answered before I proceed to build my 
system. I'm working through the sections in Chapter 6 in the presecribed 
order but because of time constraints I will have to shutdown and reboot 
frequently. The text says (on page 101) "Additional file systems will 
soon be mounted from within the chroot environment. To keep the host up 
to date, perform a "fake mount" for each of these now:

mount -f -t ramfs ramfs $LFS/dev
mount -f -t tmpfs tmpfs $LFS/dev/shm
mount -f -t devpts -o gid=4,mode=620 devpts $LFS/dev/pts
"
Why are the "fake mounts" needed? Do I need to perform these each time I 
boot my system? Reading ahead, it looks like the "real mounts" get done 
just before we start building the glibc headers. Do I need to do the 
"real mounts" before continuing the build if I shutdown? I'm thinking 
the answer is "yes", but am a little unsure. Please enlighten me.
-James



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