U盘Linux是这样诞生的！

springwind426

准备U盘：(注：我的U盘是/dev/sda)
fdisk /dev/sda  
只需要分一个主分区，128M足够了，同时需要激活该分区(make bootable)

在该分区上创建文件系统
mke2fs /dev/sda1

在U盘创建目录结构并复制必要的文件
mount /dev/sda1 /mnt/usb
mkdir -v /mnt/usb/{bin,boot,etc,home,sbin,tmp,var,proc,sys,root}
mkdir -v /mnt/usb/etc/init.d
mkdir -v /mnt/usb/var/{run,log}
mkdir -v /mnu/usb/boot/grub
chmod 1777 /mnt/usb/tmp
touch /mnt/usb/var/log/{lastlog,wtmp}
chgrp -v utmp /mnt/usb/var/log/{lastlog,wtmp}
chmod -v 664 /mnt/usb/var/log/lastlog

cp /boot/grub/{stage1,stage2,e2fs_stage1_5} /mnt/usb/boot/grub/
echo "(hd0)   /dev/sda" > /mnt/usb/boot/grub/device.map
cat > /mnt/usb/boot/grub/menu.lst <<EOF
default 1
timeout         5
color cyan/blue white/blue

title           USB kernel 2.6.21
root            (hd0,0)
kernel          /boot/vmlinux root=/dev/sda1 rw rootdelay=10 vga=794

EOF

说明：
root=/dev/sda1 rw 表示根分区是/dev/sda1 可读写
rootdelay=10 这个参数很重要，表示在挂载根分区之前先等待10秒，因为U盘的初始化是比较慢的
vga=794 控制台分辨率是1280x1024x16 (791=>1024x768x16 788=>800x600x16)

将内核复制到U盘上
cp /usr/src/linux-2.6.21/arch/i386/boot/bzImage /mnt/usb/boot/vmlinux

[color="Red"]
真不好意思，居然忘了重要的一步：（没有复制必要的可执行文件）
(注：我是在/usr/local/src/目录下编译busybox的)
cp -a /usr/local/src/busybox-1.5.1/_install/* /mnt/usb/
chown -R 0.0 /mnt/usb/{bin,sbin,linuxrc}


在宿主机上运行grub以安装grub到U盘的MBR，使得U盘能够启动并加载启动管理器(注：我的系统有两个IDE硬盘，因此这时U盘是hd2)
grub> root (hd2,0)
grub> setup (hd2)

准备必要的文件：
mknod -m 600 /mnt/usb/dev/console c 5 1

cat > /mnt/usb/etc/fstab <<EOF
proc  /proc      proc    defaults     0      0
sysfs /sys      sysfs   defaults        0       0

EOF

cat > /mnt/usb/etc/passwd <<EOF
root:x:0:0:root:/root:/bin/sh
bin:x:2:2:bin:/bin:/bin/sh
sys:x:3:3:sys:/dev:/bin/sh
nobody:x:65534:65534:nobody:/nonexistent:/bin/sh
EOF

cat > /mnt/usb/etc/group <<EOF
root:x:0:
bin:x:2:
sys:x:3:
adm:x:4:
tty:x:5:
disk:x:6:
utmp:x:43:
users:x:100:
nogroup:x:65534:
EOF

cat > /mnt/usb/etc/shadow <<EOF
root::12886:0:99999:7:::
bin:*:12886:0:99999:7:::
sys:*:12886:0:99999:7:::
nobody:*:12886:0:99999:7:::
EOF

echo "USB" > /mnt/usb/etc/hostname

cat > /mnt/usb/etc/inittab <<EOF
# /etc/inittab init(8) configuration for BusyBox
#
::sysinit:/etc/init.d/rcS
tty1::respawn:/sbin/getty 38400 tty1
tty2::respawn:/sbin/getty 38400 tty2
tty3::respawn:/sbin/getty 38400 tty3
tty4::respawn:/sbin/getty 38400 tty4
tty5::respawn:/sbin/getty 38400 tty5
tty6::respawn:/sbin/getty 38400 tty6
#
::restart:/sbin/init
#
::ctrlaltdel:/sbin/reboot
::shutdown:/bin/umount -a -r
::shutdown:/sbin/swapoff -a

EOF

cat > /mnt/usb/etc/init.d/rcS <<EOF
#! /bin/sh
PATH=/bin:/sbin

mount -a
mount -t tmpfs mdev /dev
mkdir /dev/pts
mount -t devpts devpts /dev/pts

mknod -m 600 /dev/console c 5 1
mknod -m 777 /dev/null c 1 3
mknod -m 666 /dev/zero c 1 5
mknod -m 666 /dev/tty c 5 0

for i in 0 1 2 3 4 5 6 7 8 9 10 11 12
do
  mknod -m 600 /dev/tty$i c 4 $i
done

echo /sbin/mdev > /proc/sys/kernel/hotplug
mdev -s

hostname -F /etc/hostname

syslogd
klogd

EOF

说明：
mount -a 将挂载 /etc/fstab中的文件系统
mount -t tmpfs mdev /dev /dev目录挂载在内存中
创建 /dev/tty?这样的设备，是因为用mdev创建设备的时候不自动创建这样的设备，因此启动的时候会僵死(我也不知道为什么，怎么解决，所以只好在这儿手动创建了)
mdev -s 使用mdev(busybox的组件)自动在/dev目录下创建设备节点

至此，U盘已经准备完毕，剩下的就是用U盘启动系统了
注：
需要在CMOS中设置启动顺序，将U盘排到前面，如果U盘被系统认为硬盘，那么得将U盘的位置排放到硬盘的前面，否则启动可能有问题(这个比较关键)
如果系统中是SATA硬盘，那么在启动的时候，U盘是排在SATA硬盘的后面的，因此，在那种情况下U盘的设备名就不是sda了。

启动后，当出现登录界面的时候，输入root直接回车就进入系统了。


-----------------------------
内核配置：(2.6.21)

CONFIG_X86_32=y
CONFIG_GENERIC_TIME=y
CONFIG_CLOCKSOURCE_WATCHDOG=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_SEMAPHORE_SLEEPERS=y
CONFIG_X86=y
CONFIG_MMU=y
CONFIG_ZONE_DMA=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_GENERIC_IOMAP=y
CONFIG_GENERIC_BUG=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
CONFIG_DMI=y
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
CONFIG_LOCK_KERNEL=y
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_LOCALVERSION=""
CONFIG_SWAP=y
CONFIG_BSD_PROCESS_ACCT=y
CONFIG_SYSCTL=y
CONFIG_UID16=y
CONFIG_SYSCTL_SYSCALL=y
CONFIG_KALLSYMS=y
CONFIG_HOTPLUG=y
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_SHMEM=y
CONFIG_SLAB=y
CONFIG_VM_EVENT_COUNTERS=y
CONFIG_RT_MUTEXES=y
CONFIG_BASE_SMALL=0
CONFIG_BLOCK=y
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_AS=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
CONFIG_DEFAULT_CFQ=y
CONFIG_DEFAULT_IOSCHED="cfq"
CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ=y
CONFIG_SMP=y
CONFIG_X86_PC=y
CONFIG_MPENTIUM4=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_L1_CACHE_SHIFT=7
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_CMPXCHG64=y
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_TSC=y
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
CONFIG_NR_CPUS=8
CONFIG_PREEMPT_VOLUNTARY=y
CONFIG_PREEMPT_BKL=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_MCE=y
CONFIG_VM86=y
CONFIG_EDD=y
CONFIG_HIGHMEM4G=y
CONFIG_PAGE_OFFSET=0xC0000000
CONFIG_HIGHMEM=y
CONFIG_ARCH_POPULATES_NODE_MAP=y
CONFIG_FLATMEM=y
CONFIG_FLAT_NODE_MEM_MAP=y
CONFIG_SPLIT_PTLOCK_CPUS=4
CONFIG_ZONE_DMA_FLAG=1
CONFIG_MTRR=y
CONFIG_SECCOMP=y
CONFIG_HZ_1000=y
CONFIG_HZ=1000
CONFIG_PHYSICAL_START=0x100000
CONFIG_PHYSICAL_ALIGN=0x100000
CONFIG_COMPAT_VDSO=y
CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
CONFIG_PCI=y
CONFIG_PCI_GOANY=y
CONFIG_PCI_BIOS=y
CONFIG_PCI_DIRECT=y
CONFIG_PCIEPORTBUS=y
CONFIG_HT_IRQ=y
CONFIG_ISA_DMA_API=y
CONFIG_BINFMT_ELF=y
CONFIG_BINFMT_MISC=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_PACKET_MMAP=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_FIB_HASH=y
CONFIG_SYN_COOKIES=y
CONFIG_INET_DIAG=y
CONFIG_INET_TCP_DIAG=y
CONFIG_TCP_CONG_CUBIC=y
CONFIG_DEFAULT_TCP_CONG="cubic"
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_FW_LOADER=y
CONFIG_CONNECTOR=y
CONFIG_PROC_EVENTS=y
CONFIG_BLK_DEV_FD=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_CRYPTOLOOP=y
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_COUNT=16
CONFIG_BLK_DEV_RAM_SIZE=8192
CONFIG_BLK_DEV_RAM_BLOCKSIZE=1024
CONFIG_IDE=y  
CONFIG_BLK_DEV_IDE=y
CONFIG_BLK_DEV_IDEDISK=y
CONFIG_BLK_DEV_IDECD=y
CONFIG_BLK_DEV_IDEFLOPPY=y
CONFIG_IDE_GENERIC=y
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_IDEPCI_SHARE_IRQ=y
CONFIG_BLK_DEV_GENERIC=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_SCSI=y        
CONFIG_SCSI_PROC_FS=y
CONFIG_BLK_DEV_SD=y  
CONFIG_BLK_DEV_SR=y
CONFIG_SCSI_ISCSI_ATTRS=y
CONFIG_ATA=y
CONFIG_ATA_GENERIC=y
CONFIG_NETDEVICES=y
CONFIG_TUN=y
CONFIG_NET_ETHERNET=y
CONFIG_MII=y
CONFIG_NET_VENDOR_3COM=y
CONFIG_VORTEX=y
CONFIG_TYPHOON=y
CONFIG_NET_PCI=y
CONFIG_EEPRO100=y
CONFIG_E100=y
CONFIG_8139TOO=y
CONFIG_8139TOO_PIO=y
CONFIG_8139TOO_TUNE_TWISTER=y
CONFIG_E1000=y
CONFIG_R8169=y
CONFIG_TIGON3=y
CONFIG_IXGB=y
CONFIG_WAN=y
CONFIG_LANMEDIA=y
CONFIG_HDLC=y
CONFIG_HDLC_RAW=y
CONFIG_HDLC_RAW_ETH=y
CONFIG_HDLC_CISCO=y
CONFIG_HDLC_FR=y
CONFIG_HDLC_PPP=y
CONFIG_PCI200SYN=y
CONFIG_WANXL=y
CONFIG_PC300=y
CONFIG_FARSYNC=y
CONFIG_DLCI=y
CONFIG_DLCI_MAX=8
CONFIG_SBNI=y
CONFIG_INPUT=y
CONFIG_INPUT_MOUSEDEV=y
CONFIG_INPUT_MOUSEDEV_PSAUX=y
CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768
CONFIG_INPUT_KEYBOARD=y
CONFIG_KEYBOARD_ATKBD=y
CONFIG_KEYBOARD_SUNKBD=y
CONFIG_KEYBOARD_LKKBD=y
CONFIG_KEYBOARD_XTKBD=y
CONFIG_KEYBOARD_NEWTON=y
CONFIG_INPUT_MOUSE=y
CONFIG_MOUSE_PS2=y
CONFIG_SERIO=y
CONFIG_SERIO_I8042=y
CONFIG_SERIO_LIBPS2=y
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
CONFIG_UNIX98_PTYS=y
CONFIG_LEGACY_PTYS=y
CONFIG_LEGACY_PTY_COUNT=256
CONFIG_NVRAM=y
CONFIG_RTC=y
CONFIG_AGP=y
CONFIG_FB=y  
CONFIG_FB_CFB_FILLRECT=y
CONFIG_FB_CFB_COPYAREA=y
CONFIG_FB_CFB_IMAGEBLIT=y
CONFIG_FB_VESA=y
CONFIG_VGA_CONSOLE=y
CONFIG_VIDEO_SELECT=y
CONFIG_DUMMY_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y
CONFIG_FONTS=y
CONFIG_FONT_8x8=y
CONFIG_FONT_8x16=y
CONFIG_HID=y
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB_ARCH_HAS_OHCI=y
CONFIG_USB_ARCH_HAS_EHCI=y
CONFIG_USB=y
CONFIG_USB_DEVICEFS=y
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_OHCI_HCD=y
CONFIG_USB_OHCI_LITTLE_ENDIAN=y
CONFIG_USB_UHCI_HCD=y
CONFIG_USB_STORAGE=y
CONFIG_USB_HID=y
CONFIG_EXT2_FS=y
CONFIG_EXT2_FS_XATTR=y
CONFIG_EXT2_FS_POSIX_ACL=y
CONFIG_EXT2_FS_SECURITY=y
CONFIG_EXT3_FS=y
CONFIG_EXT3_FS_XATTR=y
CONFIG_EXT3_FS_POSIX_ACL=y
CONFIG_EXT3_FS_SECURITY=y
CONFIG_JBD=y
CONFIG_FS_MBCACHE=y
CONFIG_REISERFS_FS=y
CONFIG_REISERFS_PROC_INFO=y
CONFIG_REISERFS_FS_XATTR=y
CONFIG_REISERFS_FS_POSIX_ACL=y
CONFIG_REISERFS_FS_SECURITY=y
CONFIG_FS_POSIX_ACL=y
CONFIG_ROMFS_FS=y
CONFIG_INOTIFY=y
CONFIG_INOTIFY_USER=y
CONFIG_DNOTIFY=y
CONFIG_FUSE_FS=y
CONFIG_ISO9660_FS=y
CONFIG_JOLIET=y
CONFIG_ZISOFS=y
CONFIG_UDF_FS=y
CONFIG_UDF_NLS=y
CONFIG_FAT_FS=y
CONFIG_MSDOS_FS=y
CONFIG_VFAT_FS=y
CONFIG_FAT_DEFAULT_CODEPAGE=437
CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
CONFIG_NTFS_FS=y
CONFIG_PROC_FS=y
CONFIG_PROC_SYSCTL=y
CONFIG_SYSFS=y
CONFIG_TMPFS=y
CONFIG_RAMFS=y
CONFIG_MSDOS_PARTITION=y
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1"
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_CODEPAGE_936=y
CONFIG_NLS_CODEPAGE_950=y
CONFIG_NLS_ASCII=y
CONFIG_NLS_ISO8859_1=y
CONFIG_NLS_ISO8859_15=y
CONFIG_NLS_UTF8=y
CONFIG_TRACE_IRQFLAGS_SUPPORT=y
CONFIG_LOG_BUF_SHIFT=15
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_EARLY_PRINTK=y
CONFIG_X86_FIND_SMP_CONFIG=y
CONFIG_X86_MPPARSE=y
CONFIG_DOUBLEFAULT=y
CONFIG_CRYPTO=y
CONFIG_CRYPTO_ALGAPI=y
CONFIG_CRYPTO_BLKCIPHER=y
CONFIG_CRYPTO_MANAGER=y
CONFIG_CRYPTO_CBC=y
CONFIG_BITREVERSE=y
CONFIG_CRC32=y
CONFIG_ZLIB_INFLATE=y
CONFIG_PLIST=y
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT=y
CONFIG_GENERIC_HARDIRQS=y
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_GENERIC_PENDING_IRQ=y
CONFIG_X86_SMP=y
CONFIG_X86_HT=y
CONFIG_X86_BIOS_REBOOT=y
CONFIG_X86_TRAMPOLINE=y
CONFIG_KTIME_SCALAR=y

make

－－－－－－－－－－－－－－－－－－－
busybox的配置文件(1.5.1)

CONFIG_HAVE_DOT_CONFIG=y
CONFIG_SHOW_USAGE=y
CONFIG_FEATURE_VERBOSE_USAGE=y
CONFIG_FEATURE_COMPRESS_USAGE=y
CONFIG_GETOPT_LONG=y
CONFIG_FEATURE_SUID=y
CONFIG_FEATURE_SYSLOG=y
CONFIG_BUSYBOX_EXEC_PATH="/bin/busybox"
CONFIG_STATIC=y
CONFIG_LFS=y
CONFIG_INSTALL_NO_USR=y
CONFIG_INSTALL_APPLET_SYMLINKS=y
CONFIG_PREFIX="./_install"
CONFIG_PASSWORD_MINLEN=6
CONFIG_MD5_SIZE_VS_SPEED=2
CONFIG_FEATURE_EDITING=y
CONFIG_FEATURE_EDITING_HISTORY=15
CONFIG_FEATURE_TAB_COMPLETION=y
CONFIG_FEATURE_EDITING_FANCY_PROMPT=y
CONFIG_AR=y
CONFIG_FEATURE_AR_LONG_FILENAMES=y
CONFIG_BUNZIP2=y
CONFIG_CPIO=y
CONFIG_DPKG=y
CONFIG_DPKG_DEB=y
CONFIG_GUNZIP=y
CONFIG_FEATURE_GUNZIP_UNCOMPRESS=y
CONFIG_GZIP=y
CONFIG_TAR=y
CONFIG_FEATURE_TAR_CREATE=y
CONFIG_FEATURE_TAR_BZIP2=y
CONFIG_FEATURE_TAR_GZIP=y
CONFIG_FEATURE_TAR_GNU_EXTENSIONS=y
CONFIG_FEATURE_TAR_LONG_OPTIONS=y
CONFIG_UNLZMA=y
CONFIG_UNZIP=y
CONFIG_FEATURE_DEB_TAR_GZ=y
CONFIG_FEATURE_DEB_TAR_BZ2=y
CONFIG_BASENAME=y
CONFIG_CAT=y
CONFIG_CHGRP=y
CONFIG_CHMOD=y
CONFIG_CHOWN=y
CONFIG_CHROOT=y
CONFIG_CKSUM=y
CONFIG_CP=y
CONFIG_DATE=y
CONFIG_FEATURE_DATE_ISOFMT=y
CONFIG_DD=y
CONFIG_FEATURE_DD_SIGNAL_HANDLING=y
CONFIG_DF=y
CONFIG_DIRNAME=y
CONFIG_DU=y
CONFIG_FEATURE_DU_DEFAULT_BLOCKSIZE_1K=y
CONFIG_ECHO=y
CONFIG_FEATURE_FANCY_ECHO=y
CONFIG_ENV=y
CONFIG_FEATURE_ENV_LONG_OPTIONS=y
CONFIG_EXPR=y
CONFIG_FALSE=y
CONFIG_HEAD=y
CONFIG_FEATURE_FANCY_HEAD=y
CONFIG_HOSTID=y
CONFIG_ID=y
CONFIG_LN=y
CONFIG_LS=y
CONFIG_FEATURE_LS_FILETYPES=y
CONFIG_FEATURE_LS_FOLLOWLINKS=y
CONFIG_FEATURE_LS_RECURSIVE=y
CONFIG_FEATURE_LS_SORTFILES=y
CONFIG_FEATURE_LS_TIMESTAMPS=y
CONFIG_FEATURE_LS_USERNAME=y
CONFIG_FEATURE_LS_color=y
CONFIG_FEATURE_LS_COLOR_IS_DEFAULT=y
CONFIG_MD5SUM=y
CONFIG_MKDIR=y
CONFIG_FEATURE_MKDIR_LONG_OPTIONS=y
CONFIG_MKNOD=y
CONFIG_MV=y
CONFIG_FEATURE_MV_LONG_OPTIONS=y
CONFIG_NOHUP=y
CONFIG_PWD=y
CONFIG_REALPATH=y
CONFIG_RM=y
CONFIG_RMDIR=y
CONFIG_SEQ=y
CONFIG_SHA1SUM=y
CONFIG_SLEEP=y
CONFIG_SORT=y
CONFIG_FEATURE_SORT_BIG=y
CONFIG_STAT=y
CONFIG_FEATURE_STAT_FORMAT=y
CONFIG_SYNC=y
CONFIG_TAIL=y
CONFIG_FEATURE_FANCY_TAIL=y
CONFIG_TEST=y
CONFIG_TOUCH=y
CONFIG_TRUE=y
CONFIG_TTY=y
CONFIG_UNAME=y
CONFIG_UNIQ=y
CONFIG_WC=y
CONFIG_FEATURE_WC_LARGE=y
CONFIG_WHO=y
CONFIG_WHOAMI=y
CONFIG_YES=y
CONFIG_FEATURE_PRESERVE_HARDLINKS=y
CONFIG_FEATURE_AUTOWIDTH=y
CONFIG_FEATURE_HUMAN_READABLE=y
CONFIG_FEATURE_MD5_SHA1_SUM_CHECK=y
CONFIG_CLEAR=y
CONFIG_RESET=y
CONFIG_MKTEMP=y
CONFIG_READLINK=y
CONFIG_FEATURE_READLINK_FOLLOW=y
CONFIG_WHICH=y
CONFIG_AWK=y
CONFIG_FEATURE_AWK_MATH=y
CONFIG_PATCH=y
CONFIG_SED=y
CONFIG_VI=y
CONFIG_FEATURE_VI_COLON=y
CONFIG_FEATURE_VI_YANKMARK=y
CONFIG_FEATURE_VI_SEARCH=y
CONFIG_FEATURE_VI_USE_SIGNALS=y
CONFIG_FEATURE_VI_DOT_CMD=y
CONFIG_FEATURE_VI_READONLY=y
CONFIG_FEATURE_VI_SETOPTS=y
CONFIG_FEATURE_VI_SET=y
CONFIG_FEATURE_VI_WIN_RESIZE=y
CONFIG_FEATURE_VI_OPTIMIZE_CURSOR=y
CONFIG_FEATURE_ALLOW_EXEC=y
CONFIG_FIND=y
CONFIG_FEATURE_FIND_PRINT0=y
CONFIG_FEATURE_FIND_MTIME=y
CONFIG_FEATURE_FIND_MMIN=y
CONFIG_FEATURE_FIND_PERM=y
CONFIG_FEATURE_FIND_TYPE=y
CONFIG_FEATURE_FIND_XDEV=y
CONFIG_FEATURE_FIND_NEWER=y
CONFIG_FEATURE_FIND_INUM=y
CONFIG_FEATURE_FIND_EXEC=y
CONFIG_FEATURE_FIND_USER=y
CONFIG_FEATURE_FIND_NOT=y
CONFIG_GREP=y
CONFIG_FEATURE_GREP_EGREP_ALIAS=y
CONFIG_FEATURE_GREP_FGREP_ALIAS=y
CONFIG_FEATURE_GREP_CONTEXT=y
CONFIG_XARGS=y
CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION=y
CONFIG_FEATURE_XARGS_SUPPORT_QUOTES=y
CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT=y
CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM=y
CONFIG_INIT=y
CONFIG_FEATURE_USE_INITTAB=y
CONFIG_FEATURE_INIT_SYSLOG=y
CONFIG_FEATURE_INITRD=y
CONFIG_HALT=y
CONFIG_MESG=y
CONFIG_FEATURE_SHADOWPASSWDS=y
CONFIG_USE_BB_SHADOW=y
CONFIG_USE_BB_PWD_GRP=y
CONFIG_ADDGROUP=y
CONFIG_DELGROUP=y
CONFIG_ADDUSER=y
CONFIG_DELUSER=y
CONFIG_GETTY=y
CONFIG_FEATURE_UTMP=y
CONFIG_FEATURE_WTMP=y
CONFIG_LOGIN=y
CONFIG_PASSWD=y
CONFIG_FEATURE_PASSWD_WEAK_CHECK=y
CONFIG_SU=y
CONFIG_FEATURE_SU_SYSLOG=y
CONFIG_FEATURE_SU_CHECKS_SHELLS=y
CONFIG_DMESG=y
CONFIG_FEATURE_DMESG_PRETTY=y
CONFIG_FDISK=y
CONFIG_FDISK_SUPPORT_LARGE_DISKS=y
CONFIG_FEATURE_FDISK_WRITABLE=y
CONFIG_GETOPT=y
CONFIG_MDEV=y
CONFIG_MKSWAP=y
CONFIG_MORE=y
CONFIG_FEATURE_USE_TERMIOS=y
CONFIG_MOUNT=y
CONFIG_FEATURE_MOUNT_FLAGS=y
CONFIG_FEATURE_MOUNT_FSTAB=y
CONFIG_SWAPONOFF=y
CONFIG_UMOUNT=y
CONFIG_FEATURE_UMOUNT_ALL=y
CONFIG_FEATURE_MOUNT_LOOP=y
CONFIG_LAST=y
CONFIG_LESS=y
CONFIG_FEATURE_LESS_MAXLINES=9999999
CONFIG_FEATURE_LESS_BRACKETS=y
CONFIG_FEATURE_LESS_FLAGS=y
CONFIG_FEATURE_LESS_FLAGCS=y
CONFIG_FEATURE_LESS_MARKS=y
CONFIG_FEATURE_LESS_REGEXP=y
CONFIG_HDPARM=y
CONFIG_FEATURE_HDPARM_GET_IDENTITY=y
CONFIG_MOUNTPOINT=y
CONFIG_TIME=y
CONFIG_ARP=y
CONFIG_FTPGET=y
CONFIG_FTPPUT=y
CONFIG_FEATURE_FTPGETPUT_LONG_OPTIONS=y
CONFIG_HOSTNAME=y
CONFIG_HTTPD=y
CONFIG_FEATURE_HTTPD_SETUID=y
CONFIG_FEATURE_HTTPD_BASIC_AUTH=y
CONFIG_FEATURE_HTTPD_AUTH_MD5=y
CONFIG_FEATURE_HTTPD_CGI=y
CONFIG_FEATURE_HTTPD_ENCODE_URL_STR=y
CONFIG_IFCONFIG=y
CONFIG_FEATURE_IFCONFIG_STATUS=y
CONFIG_FEATURE_IFCONFIG_SLIP=y
CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ=y
CONFIG_FEATURE_IFCONFIG_HW=y
CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS=y
CONFIG_IFUPDOWN=y
CONFIG_FEATURE_IFUPDOWN_IFCONFIG_BUILTIN=y
CONFIG_FEATURE_IFUPDOWN_IPV4=y
CONFIG_IP=y
CONFIG_FEATURE_IP_ADDRESS=y
CONFIG_FEATURE_IP_LINK=y
CONFIG_FEATURE_IP_ROUTE=y
CONFIG_FEATURE_IP_SHORT_FORMS=y
CONFIG_IPADDR=y
CONFIG_IPLINK=y
CONFIG_IPROUTE=y
CONFIG_NAMEIF=y
CONFIG_NETSTAT=y
CONFIG_NSLOOKUP=y
CONFIG_PING=y
CONFIG_FEATURE_FANCY_PING=y
CONFIG_ROUTE=y
CONFIG_TELNET=y
CONFIG_FEATURE_TELNET_TTYPE=y
CONFIG_FEATURE_TELNET_AUTOLOGIN=y
CONFIG_TELNETD=y
CONFIG_FEATURE_TELNETD_STANDALONE=y
CONFIG_TFTP=y
CONFIG_FEATURE_TFTP_GET=y
CONFIG_FEATURE_TFTP_PUT=y
CONFIG_TRACEROUTE=y
CONFIG_FEATURE_TRACEROUTE_VERBOSE=y
CONFIG_APP_UDHCPC=y
CONFIG_FEATURE_RFC3397=y
CONFIG_WGET=y
CONFIG_FEATURE_WGET_STATUSBAR=y
CONFIG_FEATURE_WGET_AUTHENTICATION=y
CONFIG_FEATURE_WGET_LONG_OPTIONS=y
CONFIG_FREE=y
CONFIG_FUSER=y
CONFIG_KILL=y
CONFIG_KILLALL=y
CONFIG_PIDOF=y
CONFIG_FEATURE_PIDOF_SINGLE=y
CONFIG_FEATURE_PIDOF_OMIT=y
CONFIG_PS=y
CONFIG_FEATURE_PS_WIDE=y
CONFIG_BB_SYSCTL=y
CONFIG_TOP=y
CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE=y
CONFIG_UPTIME=y
CONFIG_FEATURE_SH_IS_ASH=y
CONFIG_ASH=y
CONFIG_ASH_JOB_CONTROL=y
CONFIG_ASH_READ_NCHARS=y
CONFIG_ASH_READ_TIMEOUT=y
CONFIG_ASH_ALIAS=y
CONFIG_ASH_MATH_SUPPORT=y
CONFIG_ASH_GETOPTS=y
CONFIG_ASH_BUILTIN_ECHO=y
CONFIG_ASH_BUILTIN_TEST=y
CONFIG_ASH_MAIL=y
CONFIG_ASH_OPTIMIZE_FOR_SIZE=y
CONFIG_ASH_EXPAND_PRMT=y
CONFIG_SYSLOGD=y
CONFIG_FEATURE_ROTATE_LOGFILE=y
CONFIG_FEATURE_IPC_SYSLOG=y
CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE=16
CONFIG_LOGREAD=y
CONFIG_FEATURE_LOGREAD_REDUCED_LOCKING=y
CONFIG_KLOGD=y
CONFIG_LOGGER=y

make
make install

jetking

cool!!!

springwind426

如果想让你的U盘Linux能够认出大部分的SATA硬盘或者PATA硬盘，那么需要在内核配置文件中添加下面的这些设置参数：（或者直接将内核配置文件中的SATA那个部分的驱动全部选中）
CONFIG_SATA_SVW=y
CONFIG_ATA_PIIX=y
CONFIG_SATA_NV=y
CONFIG_SATA_PROMISE=y
CONFIG_SATA_SIS=y
CONFIG_SATA_VIA=y
CONFIG_SATA_VITESSE=y
CONFIG_SATA_INTEL_COMBINED=y
CONFIG_PATA_AMD=y
CONFIG_PATA_MPIIX=y
CONFIG_PATA_SIS=y
CONFIG_PATA_VIA=y
CONFIG_PATA_WINBOND=y

sunny_5252

支持下。呵呵!

huohuliaisili

有盘的时候，没找到做U盘系统的方法。

楼主的文章写完了吧？写完了，我就收下了。

springwind426

这个只是一个功能很弱的U盘启动的linux，主要是描述一个U盘启动的方法，因为使用的busybox，没有安装其他的任何的软件，因此功能是很弱的

valpa

Post by springwind426
准备U盘：(注：我的U盘是/dev/sda)
fdisk /dev/sda  
只需要分一个主分区，128M足够了，同时需要激活该分区(make bootable)
...
make
make install

32M的U盘也够了吧

还有一个问题，你只拷贝了busybox的tool和linux内核，其他工具，比如grub也是自己编译的吗？有经历过LFS的chroot等过程吗？

springwind426

安装Grub是利用宿主机上的grub来安装的
busybox和内核都是在宿主机器上编译的，busybox是静态编译的，因此没有任何的运行库，所以说它功能很弱（busybox编译进去的工具可以从配置文件中看到）

所有操作过程都是在宿主机上进行，没有任何的chroot过程

实际上占用的空间是很小的，16M的U盘也够了（如果你还有16M的U盘的话，我手头有一个16M的U盘，可惜在我的本本上，如果用它做启动盘的话开机自检就不能通过）

valpa

为什么grub安装用的是hd2， 而mount用的是sda呢

springwind426

因为安装grub的时候是在宿主机器上做的，而启动的时候是用U盘启动的，所以就是sda了