NFS掛載嵌入式Linux根文件系統

   之前轉載過一篇《nfs掛載android根文件系統》，但是自己一直都沒做成功過，之前因爲掛載普通嵌入式Linux根文件系統總是在內核剛啓動時，開發板就不向串口打印信息了，而是直接打印到開發板lcd屏上，我想這肯定是uboot的啓動參數沒有設置正確。但是由於找工作的原因一直都沒有去解決。

    今天由於必須用nfs掛載android根文件系統，又重新回到這樣一個問題中來，沒有設置正確的uboot啓動參數，經過多次嘗試，終於能讓開發板向串口打印信息了。具體設置的uboot的啓動參數如下：

>setenv ipaddr 192.168.3.189

>setenv getway 192.168.3.254

>setenv serverip 192.168.3.201

>setenv bootargs root=/dev/nfs rw nfsroot=192.168.3.201:/home/yww/nfs,proto=tcp,nfsvers=3,nolock ip=192.168.3.189:192.168.3.201:192.168.3.254:255.255.255.0:YWW:eth0:off console=ttySAC0,115200 init=/linuxrc

需要說明一點的是，在啓動參數中，設置了nfsroot=192.168.3.201:/home/yww/nfs,proto=tcp,nfsvers=3,nolock ，後面這三個參數是在出現了

可以在宿主機上用ping命令ping一下開發板ip，此時終於能夠ping通了~~哈哈~~成功不遠了~~

     雖然能夠向串口打印信息，這樣一來，就能看到了到底有沒有成功掛載，能夠看到出現什麼問題了，不出所料啊~~新問題就出來了：

+------------------------------------------------+ | Uboot 1.1.6 For TX-2440A With USB Downloader | +------------------------------------------------+ Press Space key to Download Mode ! Booting Linux ... Copy linux kernel from 0x00120000 to 0x30008000, size = 0x00400000 ... Copy Kernel to SDRAM done,NOW, Booting Linux...... Uncompressing Linux.......................................................................................................................................... done, booting the kernel. Linux version 2.6.31 ([e-mail]) (gcc version 4.1.2) #17 Mon Oct 18 21:16:12 CST 2010 CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177 CPU: VIVT data cache, VIVT instruction cache Machine: SMDK2440 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 400.000 MHz, memory 100.000 MHz, peripheral 50.000 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: root=/dev/nfs rw rootfstype=nfs rsize=1024,wsize=1024 nfsroot=192.168.3.201:/home/yww/nfs,proto=tcp,nfsvers=3,nolock ip=192.168.3.189:192.168.3.201:192.168.3.254:255.255.255.0:YWW:eth0:off console=ttySAC0,115200 init=/linuxrc PID hash table entries: 256 (order: 8, 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: 60396KB available (3796K code, 332K data, 204K init, 0K highmem) NR_IRQS:85 irq: clearing pending ext status 000c0800 irq: clearing subpending status 00000002 Console: colour dummy device 80x30 console [ttySAC0] enabled Calibrating delay loop... 199.47 BogoMIPS (lpj=498688) Mount-cache hash table entries: 512 CPU: Testing write buffer coherency: ok NET: Registered protocol family 16 S3C Power Management, Copyright 2004 Simtec Electronics 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 <bio-0> 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 97 KHz s3c-i2c s3c2440-i2c: i2c-0: S3C I2C adapter 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 NetWinder Floating Point Emulator V0.97 (extended precision) yaffs Sep 16 2010 19:21:37 Installing. msgmni has been set to 118 alg: No test for stdrng (krng) io scheduler noop registered io scheduler anticipatory registered (default) io scheduler deadline registered io scheduler cfq registered Console: switching to colour frame buffer device 40x30 fb0: s3c2410fb frame buffer device adc initialized lp: driver loaded but no devices found ppdev: user-space parallel port driver Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled 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 brd: module loaded loop: module loaded nbd: registered device at major 43 Uniform Multi-Platform E-IDE driver ide-gd driver 1.18 ide-cd driver 5.00 dm9000 Ethernet Driver, V1.31 Now use the default MAC address: 08:90:90:90:90:90 eth0: dm9000e at c4814000,c4818004 IRQ 62 MAC: 08:90:90:90:90:90 (www.yww.com) S3C24XX NAND Driver, (c) 2004 Simtec Electronics s3c24xx-nand s3c2440-nand: Tacls=1, 10ns Twrph0=3 30ns, Twrph1=1 10ns s3c24xx-nand s3c2440-nand: NAND hardware ECC NAND device: Manufacturer ID: 0xec, Chip ID: 0xda (Samsung NAND 256MiB 3,3V 8-bit) Scanning device for bad blocks Bad eraseblock 97 at 0x000000c20000 Bad eraseblock 743 at 0x000005ce0000 Bad eraseblock 917 at 0x0000072a0000 Bad eraseblock 954 at 0x000007740000 Bad eraseblock 1195 at 0x000009560000 Bad eraseblock 1346 at 0x00000a840000 Bad eraseblock 1821 at 0x00000e3a0000 Creating 3 MTD partitions on "NAND 256MiB 3,3V 8-bit": 0x000000000000-0x000000100000 : "YWW_BOOT" 0x000000120000-0x000000520000 : "YWW_KERNEL" 0x000000520000-0x000010000000 : "YWW_YAFFS2" usbmon: debugfs is not available 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: 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 usbserial USB Serial support registered for generic usbcore: registered new interface driver usbserial_generic usbserial: USB Serial Driver core 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 pl2303 usbcore: registered new interface driver pl2303 pl2303: Prolific PL2303 USB to serial adaptor driver usbcore: registered new interface driver usbsevseg mice: PS/2 mouse device common for all mice s3c2410 TouchScreen successfully loaded input: s3c2410 TouchScreen as /class/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 Linux video capture interface: v2.00 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 usbcore: registered new interface driver hiddev usbcore: registered new interface driver usbhid usbhid: v2.6:USB HID core driver Advanced Linux Sound Architecture Driver Version 1.0.20. ALSA device list: No soundcards found. TCP cubic registered NET: Registered protocol family 17 RPC: Registered udp transport module. RPC: Registered tcp transport module. s3c2410-rtc s3c2410-rtc: setting system clock to 2011-01-17 16:04:28 UTC (1295280268) usb 1-1: new full speed USB device using s3c2410-ohci and address 2 usb 1-1: configuration #1 chosen from 1 choice hub 1-1:1.0: USB hub found hub 1-1:1.0: 4 ports detected dm9000 dm9000.0: WARNING: no IRQ resource flags set. eth0: link down IP-Config: Complete: device=eth0, addr=192.168.3.189, mask=255.255.255.0, gw=192.168.3.254, host=YWW, domain=, nis-domain=(none), bootserver=192.168.3.201, rootserver=192.168.3.201, rootpath= Looking up port of RPC 100003/3 on 192.168.3.201 eth0: link up, 100Mbps, full-duplex, lpa 0x4DE1 Looking up port of RPC 100005/3 on 192.168.3.201 Root-NFS: Unable to get mountd port number from server, using default Root-NFS: Server returned error -5 while mounting /home/yww/nfs VFS: Unable to mount root fs via NFS, trying floppy. List of all partitions: 1f00 1024 mtdblock0 (driver?) 1f01 4096 mtdblock1 (driver?) 1f02 256896 mtdblock2 (driver?) No filesystem could mount root, tried: nfs Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0) [<c00417f8>] (unwind_backtrace+0x0/0xd4) from [<c005b610>] (panic+0x40/0x124) [<c005b610>] (panic+0x40/0x124) from [<c0009080>] (mount_block_root+0x1c4/0x20c) [<c0009080>] (mount_block_root+0x1c4/0x20c) from [<c0009334>] (prepare_namespace+0x168/0x1cc) [<c0009334>] (prepare_namespace+0x168/0x1cc) from [<c00088d4>] (kernel_init+0xc8/0xfc) [<c00088d4>] (kernel_init+0xc8/0xfc) from [<c003cd6c>] (kernel_thread_exit+0x0/0x8)

 

可以看到出現的新問題：

Root-NFS: Unable to get mountd port number from server, using default

Root-NFS: Server returned error -5 while mounting /home/yww/nfs

我們在主機上ping 192.168.3.189

64 bytes from 192.168.3.189: icmp_seq=99 ttl=64 time=1.02 ms
64 bytes from 192.168.3.189: icmp_seq=100 ttl=64 time=1.34 ms
64 bytes from 192.168.3.189: icmp_seq=101 ttl=64 time=0.993 ms

--- 192.168.3.189 ping statistics ---
101 packets transmitted, 101 received, 0% packet loss, time 100011ms
rtt min/avg/max/mdev = 0.777/1.187/6.680/0.894 ms
看上去好像沒有丟包啊~~可是爲什麼掛載不了呢~~~？？？？？

還不是很清楚啊~~會不會是我將我的開發板與主機之間用路由器相連的緣故，明天拿交叉網線直接將開發板與主機連上試試看~~相信會成功的~~哈哈~~大家等等哦~~呵呵~~

 

nfs: server 192.168.3.201 not responding, still trying問題之後加上去的。問題的原因是nfs默認使用的UDP協議，這協議丟包比較嚴重，所以用上述三個參數將nfs設置爲：tcp協議。