Files:

/linuxrc
/sbin/vgchange
/sbin/vgscan
/sbin/raidstart
/lib/modules/xor.o
/lib/modules/raid5.o
/lib/modules/md.o
/lib/modules/lvm-mod.o
/lib/modules/aic7xxx.o
/lib/modules/sd_mod.o
/lib/modules/scsi_mod.o
/lib/modules/loop.o
/lib/liblvm-10.so.1
/lib/libc.so.6
/lib/ld-linux.so.2
/lib/liblvm-10.so
/lib/liblvm-10.so.1.0
/bin/sh
/bin/busybox
/etc/raidtab

Empty directories:

/tmp
/proc		(mountpoint for procfs)
/mnt		(a convenient place to mount filesystems)
/sysroot	(this is where the real root filesystem gets mounted)

Devices:

/dev/console
/dev/fd0
/dev/null
/dev/ram
/dev/systty
/dev/zero

You'll also want device nodes for any storage devices (e.g.,
/dev/hd*, /dev/sd*, /dev/md*, etc).