u盘引导bootonly.iso安装FreeBSD

blueskyghost_cu

用grub做吧，一样好用，下面是我做的grub配置文件menu.lst：
default 2
timeout 300

splashimage /boot/grub/openbsd.xpm.gz

title -----Live USB-----
root

title Austrumi-1.9.5
kernel /austrumi/bzImage dousb lang_en
initrd /austrumi/initrd.gz

title DeepinPE-2.0
kernel /boot/kernel/ldntldr.bin
initrd /ntldr

title FreeNAS-0.7.1
kernel /boot/kernel/memdisk.gz
initrd /boot/image/freenas071.fs

title m0n0wall-1.32
kernel /boot/kernel/memdisk.gz
initrd /boot/image/m0n0132.fs

title macpup-511
kernel /macpup/vmlinuz pmedia=cd toram
initrd /macpup/initrd.gz

title Pmagic-5.7
kernel /pmagic/bzImage
initrd /pmagic/initramfs edd=off noapic load_ramdisk=1 prompt_ramdisk=0 rw vga=788 loglevel=0 max_loop=256 keymap=us zh_CN

title Puppy-4.2.1
kernel /puppy/vmlinuz pmedia=cd toram
initrd /puppy/initrd.gz

title slitaz-3.0
kernel /slitaz/bzImage
initrd /slitaz/rootfs.gz rw root=/dev/null vga=normal autologin

title tinycore-3.0
kernel /tinycore/bzImage
initrd /tinycore/tinycore.gz quiet

title -----Linux SYSTEMS-----
root
  
title CentOS-4.8-installer
kernel /boot/kernel/centos48 toram
initrd /boot/image/centos48.img

title CentOS-5.5-installer
kernel /boot/kernel/centos55 toram
initrd /boot/image/centos55.img

title Debian-5.0.5-installer
kernel /boot/kernel/debian505 toram
initrd /boot/image/debian505.gz

title Ubuntu-10.10-installer
kernel /boot/kernel/ubuntu1010 toram
initrd /boot/image/ubuntu1010.gz

title -----BSD SYSTEMS-----
root

title FreeBSD-7.3-installer
kernel /boot/kernel/memdisk.gz
initrd /boot/image/freebsd73.fs

title FreeBSD-8.1-installer
kernel /boot/kernel/memdisk.gz
initrd /boot/image/freebsd81.fs

title NetBSD-5.0.2-installer
kernel /boot/kernel/memdisk.gz
initrd /boot/image/netbsd502.fs

title OpenBSD-4.8-installer
kernel /boot/kernel/memdisk.gz
initrd /boot/image/openbsd48.fs

title -----OTHERS-----
root

title MemTest86+
kernel /boot/kernel/memtest86+.bin