之前按照开发板用户指南想把pc作为NFS服务器，使根文件系统在pc就行，而不用在目标板上了。
但是怎么试 都不行，出来的提示如下：
Supervivi> param set linux_cmd_line "console=ttySAC0 root=/dev/nfs nfsroot=192.168.1.101:/opt/Friend
lyARM/mini2440/root_qtopia ip=192.168.1.110:192.168.1.101:192.168.1.1:255.255.255.0:sbc2440.arm9.net
:eth0:off"
Change linux command line to "console=ttySAC0 root=/dev/nfs nfsroot=192.168.1.101:/opt/FriendlyARM/m
ini2440/root_qtopia ip=192.168.1.110:192.168.1.101:192.168.1.1:255.255.255.0:sbc2440.arm9.net:eth0:o
ff"
Supervivi> boot
Copy linux kernel from 0x00060000 to 0x30008000, size = 0x00500000 ... done
zImage magic = 0x016f2818
Setup linux parameters at 0x30000100
linux command line is: "console=ttySAC0 root=/dev/nfs nfsroot=192.168.1.101:/opt/FriendlyARM/mini244
0/root_qtopia ip=192.168.1.110:192.168.1.101:192.168.1.1:255.255.255.0:sbc2440.arm9.net:eth0:off"
MACH_TYPE = 1999
NOW, Booting Linux......
Uncompressing Linux.................................................................................
.................................................................................. done, booting the
kernel.
Linux version 2.6.32.2-FriendlyARM (root@tom) (gcc version 4.3.2 (Sourcery G++ Lite 2008q3-72) ) #1
Fri Jan 8 12:53:23 CST 2010
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
CPU: VIVT data cache, VIVT instruction cache
Machine: FriendlyARM Mini2440 development board
ATAG_INITRD is deprecated; please update your bootloader.
Memory policy: ECC disabled, Data cache writeback
CPU S3C2440A (id 0x32440001)
S3C24XX Clocks, (c) 2004 Simtec Electronics
S3C244X: core 405.000 MHz, memory 101.250 MHz, peripheral 50.625 MHz
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
Kernel command line: console=ttySAC0 root=/dev/nfs nfsroot=192.168.1.101:/opt/FriendlyARM/mini2440/r
oot_qtopia ip=192.168.1.110:192.168.1.101:192.168.1.1:255.255.255.0:sbc2440.arm9.net:eth0:off
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 59560KB available (4676K code, 469K data, 160K init, 0K highmem)
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Hierarchical RCU implementation.
NR_IRQS:85
irq: clearing subpending status 00000003
irq: clearing subpending status 00000002
Console: colour dummy device 80x30
console [ttySAC0] enabled
Calibrating delay loop... 201.93 BogoMIPS (lpj=504832)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
S3C2440: Initialising architecture
S3C2440: IRQ Support
S3C24XX DMA Driver, (c) 2003-2004,2006 Simtec Electronics
DMA channel 0 at c4808000, irq 33
DMA channel 1 at c4808040, irq 34
DMA channel 2 at c4808080, irq 35
DMA channel 3 at c48080c0, irq 36
S3C244X: Clock Support, DVS off
bio: create slab
at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
s3c-i2c s3c2440-i2c: slave address 0x10
s3c-i2c s3c2440-i2c: bus frequency set to 98 KHz
s3c-i2c s3c2440-i2c: i2c-0: S3C I2C adapter
cfg80211: Calling CRDA to update world regulatory domain
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
NET: Registered protocol family 1
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
NetWinder Floating Point Emulator V0.97 (double precision)
yaffs Jan 8 2010 12:48:07 Installing.
msgmni has been set to 116
alg: No test for stdrng (krng)
io scheduler noop registered (default)
Console: switching to colour frame buffer device 30x20
fb0: s3c2410fb frame buffer device
backlight initialized
leds initialized
buttons initialized
pwm initialized
adc initialized
s3c2440-uart.0: s3c2410_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2440
s3c2440-uart.1: s3c2410_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2440
s3c2440-uart.2: s3c2410_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2440
loop: module loaded
S3C24XX NAND Driver, (c) 2004 Simtec Electronics
s3c24xx-nand s3c2440-nand: Tacls=3, 29ns Twrph0=7 69ns, Twrph1=3 29ns
s3c24xx-nand s3c2440-nand: NAND soft ECC
NAND device: Manufacturer ID: 0xec, Chip ID: 0xda (Samsung NAND 256MiB 3,3V 8-bit)
Scanning device for bad blocks
Bad eraseblock 748 at 0x000005d80000
Bad eraseblock 1132 at 0x000008d80000
Bad eraseblock 1495 at 0x00000bae0000
Bad eraseblock 1820 at 0x00000e380000
Creating 5 MTD partitions on "NAND 256MiB 3,3V 8-bit":
0x000000000000-0x000000040000 : "supervivi"
0x000000040000-0x000000060000 : "param"
0x000000060000-0x000000560000 : "Kernel"
0x000000560000-0x000040560000 : "root"
mtd: partition "root" extends beyond the end of device "NAND 256MiB 3,3V 8-bit" -- size truncated to
0xfaa0000
0x000000000000-0x000040000000 : "nand"
mtd: partition "nand" extends beyond the end of device "NAND 256MiB 3,3V 8-bit" -- size truncated to
0x10000000
dm9000 Ethernet Driver, V1.31
eth0: dm9000e at c4814300,c4818304 IRQ 51 MAC: 08:90:90:90:90:90 (chip)
Atmel at76x USB Wireless LAN Driver 0.17 loading
usbcore: registered new interface driver at76c50x-usb
usbcore: registered new interface driver zd1211rw
usbcore: registered new interface driver rtl8187
usbcore: registered new interface driver zd1201
usbcore: registered new interface driver rt2500usb
usbcore: registered new interface driver rt73usb
usbcore: registered new interface driver rt2800usb
usbcore: registered new interface driver ar9170usb
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
s3c2410-ohci s3c2410-ohci: S3C24XX OHCI
s3c2410-ohci s3c2410-ohci: new USB bus registered, assigned bus number 1
s3c2410-ohci s3c2410-ohci: irq 42, io mem 0x49000000
usb usb1: New USB device found, idVendor=1d6b, idProduct=0001
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: S3C24XX OHCI
usb usb1: Manufacturer: Linux 2.6.32.2-FriendlyARM ohci_hcd
usb usb1: SerialNumber: s3c24xx
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usbcore: registered new interface driver ums-alauda
usbcore: registered new interface driver ums-cypress
usbcore: registered new interface driver ums-datafab
usbcore: registered new interface driver ums-freecom
usbcore: registered new interface driver ums-isd200
usbcore: registered new interface driver ums-jumpshot
usbcore: registered new interface driver ums-karma
usbcore: registered new interface driver ums-onetouch
usbcore: registered new interface driver ums-sddr09
usbcore: registered new interface driver ums-sddr55
usbcore: registered new interface driver ums-usbat
usbcore: registered new interface driver usbserial
USB Serial support registered for generic
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial Driver core
USB Serial support registered for aircable
usbcore: registered new interface driver aircable
USB Serial support registered for ark3116
usbcore: registered new interface driver ark3116
USB Serial support registered for Belkin / Peracom / GoHubs USB Serial Adapter
usbcore: registered new interface driver belkin
belkin_sa: v1.2:USB Belkin Serial converter driver
USB Serial support registered for ch341-uart
usbcore: registered new interface driver ch341
USB Serial support registered for cp210x
usbcore: registered new interface driver cp210x
cp210x: v0.09:Silicon Labs CP210x RS232 serial adaptor driver
USB Serial support registered for Reiner SCT Cyberjack USB card reader
usbcore: registered new interface driver cyberjack
cyberjack: v1.01 Matthias Bruestle
cyberjack: REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver
USB Serial support registered for DeLorme Earthmate USB
USB Serial support registered for HID->COM RS232 Adapter
USB Serial support registered for Nokia CA-42 V2 Adapter
usbcore: registered new interface driver cypress
cypress_m8: v1.09:Cypress USB to Serial Driver
USB Serial support registered for Digi 2 port USB adapter
USB Serial support registered for Digi 4 port USB adapter
usbcore: registered new interface driver digi_acceleport
digi_acceleport: v1.80.1.2:Digi AccelePort USB-2/USB-4 Serial Converter driver
USB Serial support registered for Edgeport 2 port adapter
USB Serial support registered for Edgeport 4 port adapter
USB Serial support registered for Edgeport 8 port adapter
USB Serial support registered for EPiC device
usbcore: registered new interface driver io_edgeport
io_edgeport: v2.7:Edgeport USB Serial Driver
USB Serial support registered for Edgeport TI 1 port adapter
USB Serial support registered for Edgeport TI 2 port adapter
usbcore: registered new interface driver io_ti
io_ti: v0.7mode043006:Edgeport USB Serial Driver
USB Serial support registered for empeg
usbcore: registered new interface driver empeg
empeg: v1.2:USB Empeg Mark I/II Driver
USB Serial support registered for FTDI USB Serial Device
usbcore: registered new interface driver ftdi_sio
ftdi_sio: v1.5.0:USB FTDI Serial Converters Driver
USB Serial support registered for funsoft
usbcore: registered new interface driver funsoft
USB Serial support registered for Garmin GPS usb/tty
usbcore: registered new interface driver garmin_gps
garmin_gps: v0.33:garmin gps driver
USB Serial support registered for hp4X
usbcore: registered new interface driver hp4X
hp4x: v1.00:HP4x (48/49) Generic Serial driver
USB Serial support registered for PocketPC PDA
usbcore: registered new interface driver ipaq
ipaq: v0.5:USB PocketPC PDA driver
USB Serial support registered for IPWireless converter
usbcore: registered new interface driver ipwtty
ipw: v0.3:IPWireless tty driver
USB Serial support registered for IR Dongle
usbcore: registered new interface driver ir-usb
ir_usb: v0.4:USB IR Dongle driver
USB Serial support registered for iuu_phoenix
usbcore: registered new interface driver iuu_phoenix
iuu_phoenix: v0.11:Infinity USB Unlimited Phoenix driver
USB Serial support registered for Keyspan - (without firmware)
USB Serial support registered for Keyspan 1 port adapter
USB Serial support registered for Keyspan 2 port adapter
USB Serial support registered for Keyspan 4 port adapter
usbcore: registered new interface driver keyspan
keyspan: v1.1.5:Keyspan USB to Serial Converter Driver
USB Serial support registered for Keyspan PDA
USB Serial support registered for Keyspan PDA - (prerenumeration)
USB Serial support registered for Xircom / Entregra PGS - (prerenumeration)
usbcore: registered new interface driver keyspan_pda
keyspan_pda: v1.1:USB Keyspan PDA Converter driver
USB Serial support registered for KL5KUSB105D / PalmConnect
usbcore: registered new interface driver kl5kusb105d
kl5kusb105: v0.3a:KLSI KL5KUSB105 chipset USB->Serial Converter driver
USB Serial support registered for KOBIL USB smart card terminal
usbcore: registered new interface driver kobil
kobil_sct: 21/05/2004:KOBIL USB Smart Card Terminal Driver (experimental)
USB Serial support registered for MCT U232
usbcore: registered new interface driver mct_u232
mct_u232: z2.1:Magic Control Technology USB-RS232 converter driver
USB Serial support registered for Moschip 2 port adapter
mos7720: 1.0.0.4F:Moschip USB Serial Driver
usbcore: registered new interface driver moschip7720
USB Serial support registered for Moschip 7840/7820 USB Serial Driver
mos7840: 1.3.2:Moschip 7840/7820 USB Serial Driver
usbcore: registered new interface driver mos7840
USB Serial support registered for moto-modem
usbcore: registered new interface driver moto-modem
USB Serial support registered for navman
usbcore: registered new interface driver navman
USB Serial support registered for ZyXEL - omni.net lcd plus usb
usbcore: registered new interface driver omninet
omninet: v1.1:USB ZyXEL omni.net LCD PLUS Driver
USB Serial support registered for opticon
usbcore: registered new interface driver opticon
USB Serial support registered for GSM modem (1-port)
usbcore: registered new interface driver option
option: v0.7.2:USB Driver for GSM modems
USB Serial support registered for oti6858
usbcore: registered new interface driver oti6858
USB Serial support registered for pl2303
usbcore: registered new interface driver pl2303
pl2303: Prolific PL2303 USB to serial adaptor driver
USB Serial support registered for Qualcomm USB modem
usbcore: registered new interface driver qcserial
safe_serial: v0.0b:USB Safe Encapsulated Serial
USB Serial support registered for safe_serial
usbcore: registered new interface driver safe_serial
USB Serial support registered for siemens_mpi
usbcore: registered new interface driver siemens_mpi
Driver for Siemens USB/MPI adapter
Version 0.1 09/26/2005 Thomas Hergenhahn@web.de
USB Serial support registered for Sierra USB modem
usbcore: registered new interface driver sierra
sierra: v.1.3.8:USB Driver for Sierra Wireless USB modems
USB Serial support registered for SPCP8x5
usbcore: registered new interface driver spcp8x5
spcp8x5: v0.04:SPCP8x5 USB to serial adaptor driver
USB Serial support registered for symbol
usbcore: registered new interface driver symbol
USB Serial support registered for TI USB 3410 1 port adapter
USB Serial support registered for TI USB 5052 2 port adapter
usbcore: registered new interface driver ti_usb_3410_5052
ti_usb_3410_5052: v0.9:TI USB 3410/5052 Serial Driver
USB Serial support registered for Handspring Visor / Palm OS
USB Serial support registered for Sony Clie 3.5
USB Serial support registered for Sony Clie 5.0
usbcore: registered new interface driver visor
visor: USB HandSpring Visor / Palm OS driver
USB Serial support registered for Connect Tech - WhiteHEAT - (prerenumeration)
USB Serial support registered for Connect Tech - WhiteHEAT
usbcore: registered new interface driver whiteheat
whiteheat: v2.0:USB ConnectTech WhiteHEAT driver
mice: PS/2 mouse device common for all mice
s3c2410 TouchScreen successfully loaded
input: s3c2410 TouchScreen as /devices/virtual/input/input0
S3C24XX RTC, (c) 2004,2006 Simtec Electronics
s3c2410-rtc s3c2410-rtc: rtc disabled, re-enabling
s3c2410-rtc s3c2410-rtc: rtc core: registered s3c as rtc0
i2c /dev entries driver
Linux video capture interface: v2.00
gspca: main v2.7.0 registered
usbcore: registered new interface driver conex
conex: registered
usbcore: registered new interface driver etoms
etoms: registered
usbcore: registered new interface driver finepix
finepix: registered
usbcore: registered new interface driver jeilinj
jeilinj: registered
usbcore: registered new interface driver mars
mars: registered
usbcore: registered new interface driver mr97310a
mr97310a: registered
usbcore: registered new interface driver ov519
ov519: registered
usbcore: registered new interface driver ov534
ov534: registered
usbcore: registered new interface driver pac207
pac207: registered
usbcore: registered new interface driver pac7311
pac7311: registered
usbcore: registered new interface driver sn9c20x
sn9c20x: registered
usbcore: registered new interface driver sonixb
sonixb: registered
usbcore: registered new interface driver sonixj
sonixj: registered
usbcore: registered new interface driver spca500
spca500: registered
usbcore: registered new interface driver spca501
spca501: registered
usbcore: registered new interface driver spca505
spca505: registered
usbcore: registered new interface driver spca506
spca506: registered
usbcore: registered new interface driver spca508
spca508: registered
usbcore: registered new interface driver spca561
spca561: registered
usbcore: registered new interface driver sq905
sq905: registered
usbcore: registered new interface driver sq905c
sq905c: registered
usbcore: registered new interface driver sunplus
sunplus: registered
usbcore: registered new interface driver stk014
stk014: registered
usbcore: registered new interface driver t613
t613: registered
usbcore: registered new interface driver tv8532
tv8532: registered
usbcore: registered new interface driver vc032x
vc032x: registered
usbcore: registered new interface driver zc3xx
zc3xx: registered
usbcore: registered new interface driver ALi m5602
ALi m5602: registered
usbcore: registered new interface driver STV06xx
STV06xx: registered
gspca_gl860: driver startup - version 0.9d10
usbcore: registered new interface driver gspca_gl860
gspca_gl860: driver registered
usbcore: registered new interface driver uvcvideo
USB Video Class driver (v0.1.0)
initializing s3c2440 camera interface......
s3c2440 camif init done
Loading OV9650 driver.........
SCCB address 0x60, manufacture ID 0xFFFF, expect 0x7FA2
SCCB address 0x60, manufacture ID 0xFFFF, expect 0x7FA2
No OV9650 found!!!
S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics
s3c2410-wdt s3c2410-wdt: watchdog inactive, reset disabled, irq enabled
s3c-sdi s3c2440-sdi: powered down.
s3c-sdi s3c2440-sdi: mmc0 - using pio, sw SDIO IRQ
usbcore: registered new interface driver usbhid
usbhid: v2.6:USB HID core driver
Advanced Linux Sound Architecture Driver Version 1.0.21.
No device for DAI UDA134X
No device for DAI s3c24xx-i2s
S3C24XX_UDA134X SoC Audio driver
UDA134X SoC Audio Codec
asoc: UDA134X <-> s3c24xx-i2s mapping ok
ALSA device list:
#0: S3C24XX_UDA134X (UDA134X)
TCP cubic registered
lib80211: common routines for IEEE802.11 drivers
s3c2410-rtc s3c2410-rtc: setting system clock to 2010-06-26 18:52:04 UTC (1277578324)
eth0: link down
IP-Config: Complete:
device=eth0, addr=192.168.1.110, mask=255.255.255.0, gw=192.168.1.1,
host=sbc2440, domain=, nis-domain=arm9.net,
bootserver=192.168.1.101, rootserver=192.168.1.101, rootpath=
Looking up port of RPC 100003/2 on 192.168.1.101
eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
rpcbind: server 192.168.1.101 not responding, timed out
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 192.168.1.101
rpcbind: server 192.168.1.101 not responding, timed out
Root-NFS: Unable to get mountd port number from server, using default
Root-NFS: Server returned error -5 while mounting /opt/FriendlyARM/mini2440/root_qtopia
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00 256 mtdblock0 (driver?)
1f01 128 mtdblock1 (driver?)
1f02 5120 mtdblock2 (driver?)
1f03 256640 mtdblock3 (driver?)
1f04 262144 mtdblock4 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Backtrace:
[] (dump_backtrace+0x0/0x10c) from [] (dump_stack+0x18/0x1c)
r7:c39230cb r6:c0503ed0 r5:c3923000 r4:c3823f40
[] (dump_stack+0x0/0x1c) from [] (panic+0x4c/0x134)
[] (panic+0x0/0x134) from [] (mount_block_root+0x178/0x234)
r3:00000000 r2:c386492c r1:c3823f40 r0:c0453700
[] (mount_block_root+0x0/0x234) from [] (mount_root+0xb0/0xf4)
[] (mount_root+0x0/0xf4) from [] (prepare_namespace+0xf8/0x190)
r7:c05038a0 r6:c0021808 r5:c0021808 r4:c0021818
[] (prepare_namespace+0x0/0x190) from [] (kernel_init+0xf0/0x124)
r7:00000000 r6:c00200dc r5:c00205d4 r4:c00205d4
[] (kernel_init+0x0/0x124) from [] (do_exit+0x0/0x62c)
r7:00000000 r6:00000000 r5:00000000 r4:00000000
试了很多次，因为自己用的是路由器，一度怀疑是路由器就不行了？
后来发现是几个问题搞错了。
第一，目标板的ip ，linux默认的是192.168.1.230。而我上面用错了。
第二，防火墙方面的配置。因为自己对liux的防火墙机制不熟，它分了好几个层次。所以都没往这上面去想，看了网上的文章才知道的。下面是一张鸟哥的 “網路封包進入本機的流程順序图”
具体的话，要设置 三个地方：
1.关闭防火墙lokkit，这个按照 用户手册的即可。（这个可能是下面2的 图形界面，同一个东西？？）
2.关闭ip filter。即iptables服务，这里又出现了问题。一般的linux distribution命令是 #service iptables stop。
但ubuntu没有直接关掉iptables的命令。所以只能
#iptables -P INPUT ACCEPT
#iptables -P OUTPUT ACCEPT
3.设置TCP Wrappers
打开文件 /etc/hosts.allow
如果文件是空的，加入如下几行：
portmap：192.168.1.
lockd：192.168.1.
rquotad：192.168.1.
mountd:192.168.1.
statd:192.168.1.
如此一来，就OK了。
参考了：【1】.
【2】.http://hi.baidu.com/ezrax/blog/item/113695ad16d7a90d4a36d664.html/cmtid/ef11f32c9c264deb8b1399a0
【3】http://linux.vbird.org/linux_server/0240network-secure-1.php
