新安装了dvevm2.0版本，根据提供的教程“TMS320DM6446 DVEVM v2.0 Getting Started Guide，编译了一个新的uImage，因为安装后本身是没有uImage这个内核文件的。
然后Booting via TFTP Using NFS File System，检查发现TFTP以及NFS的配置没有问题。但是通过TFTP下载uImage，在uImag启动之后，挂载NFS之前，出现如下错误：
Sending DHCP requests ...... timed out!
IP-Config: Retrying forever (NFS root)...
相关信息如下：
bootdelay=3
baudrate=115200
ethaddr=00:0e:99:02:50:18
filesize=1ec848
fileaddr=8080000
ipaddr=192.168.1.188
stdin=serial
stdout=serial
stderr=serial
autostart=yes
ver=U-Boot 1.2.0 (May 11 2011 - 11:22:33)
bootcmd=dhcp;bootm
serverip=192.168.1.132
bootfile=uImage
rootpath=/opt/workdir/filesys
nfshost=192.168.1.132
videostd=PAL
bootargs=video=davincifb:vid0=0,2500K:vid1=0,2500K:osd0=720x576x16,2025K davinci_enc_mngr.ch0_output=COMPOSITE davinci_enc_mngr.ch0_mode=$(videostd) console=ttyS0,115200n8 initrd rw ip=dhcp root=/dev/nfs nfsroot=$(nfshost):$(rootpath),nolock mem=60M
Environment size: 802/131068 bytes
-----------------------------------------------------------------------------------
SEED_DVS6446_v1.2 # tftp 0x80800000 uImage
TFTP from server 192.168.1.132; our IP address is 192.168.1.188
Filename 'uImage'.
Load address: 0x80800000
Loading: #################################################################
#################################################################
########
done
Bytes transferred = 2017344 (1ec840 hex)
Automatic boot of image at addr 0x80800000 ...
## Booting image at 80800000 ...
Image Name: Linux-2.6.18_pro500-davinci_evm-
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2017280 Bytes = 1.9 MB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
OK
Starting kernel ...
Uncompressing Linux..................................................................................................................................... done, booting the kernel.
Linux version 2.6.18_pro500-davinci_evm-arm_v5t_le (root@localhost.localdomain) (gcc version 4.2.0 (MontaVista 4.2.0-16.0.32.0801914 2008-08-30)) #1 PREEMPT Fri Nov 15 15:16:05 CST 2013
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
Machine: DaVinci EVM
Memory policy: ECC disabled, Data cache writeback
DaVinci DM6443 variant 0x1
CPU0: D VIVT write-back cache
CPU0: I cache: 16384 bytes, associativity 4, 32 byte lines, 128 sets
CPU0: D cache: 8192 bytes, associativity 4, 32 byte lines, 64 sets
Built 1 zonelists. Total pages: 15360
Kernel command line: video=davincifb:vid0=0,2500K:vid1=0,2500K:osd0=720x576x16,2025K davinci_enc_mngr.ch0_output=COMPOSITE davinci_enc_mngr.ch0_mode=$(videostd) console=ttyS0,115200n8 initrd rw ip=dhcp root=/dev/nfs nfsroot=$(nfshost):$(rootpath),nolock mem=60M
PID hash table entries: 256 (order: 8, 1024 bytes)
Clock event device timer0_0 configured with caps set: 03
Console: colour dummy device 80x30
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 60MB = 60MB total
Memory: 56448KB available (3457K code, 689K data, 172K init)
Security Framework v1.0.0 initialized
Capability LSM initialized
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
DaVinci: 71 gpio irqs
WARNING: both IDE and NOR flash are enabled, but share pins.
Disable IDE for NOR support.
ch0 default output "COMPOSITE", mode "NTSC"
MUX: initialized LOEEN
MUX: initialized LFLDEN
VPBE Encoder Initialized
LogicPD encoder initialized
SCSI subsystem initialized
usbcore: registered new driver usbfs
usbcore: registered new driver hub
NET: Registered protocol family 2
IP route cache hash table entries: 512 (order: -1, 2048 bytes)
TCP established hash table entries: 2048 (order: 1, 8192 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 2048 bind 1024)
TCP reno registered
davinci_spi_board_init: NO spi support
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
squashfs: version 3.1 (2006/08/19) Phillip Lougher
JFFS2 version 2.2. (NAND) (C) 2001-2006 Red Hat, Inc.
yaffs Nov 15 2013 15:10:02 Installing.
SGI XFS with no debug enabled
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered (default)
LTT : ltt-facilities init
LTT : ltt-facility-core init in kernel
davincifb davincifb: dm_osd0_fb: Initial window configuration is invalid.
davincifb davincifb: dm_osd0_fb: 720x576x16@0,0 with framebuffer size 2025KB
davincifb davincifb: dm_vid0_fb: 0x0x16@0,0 with framebuffer size 2500KB
davincifb davincifb: dm_osd1_fb: 720x480x4@0,0 with framebuffer size 675KB
davincifb davincifb: dm_vid1_fb: 0x0x16@0,0 with framebuffer size 2500KB
davincifb davincifb.0: dm_osd0_fb: Failed to obtain ownership of OSD window.
DAVINCI-WDT: DaVinci Watchdog Timer: heartbeat 60 sec
Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled
serial8250.0: ttyS0 at MMIO map 0x1c20000 mem 0xfec20000 (irq = 40) is a 16550A
RAMDISK driver initialized: 1 RAM disks of 32768K size 1024 blocksize
netconsole: not configured, aborting
TI DaVinci EMAC: MAC address is 4e:c0:48:bd:4e:c0
TI DaVinci EMAC Linux version updated 4.0
TI DaVinci EMAC: Installed 1 instances.
Linux video capture interface: v2.00
vpfe vpfe.1: DaVinci v4l2 capture driver V1.0 loaded
Trying to register davinci display video device.
layer=c05d5600,layer->video_dev=c05d5760
Trying to register davinci display video device.
layer=c05d5400,layer->video_dev=c05d5560
davinci_init:DaVinci V4L2 Display Driver V1.0 loaded
Davici AEW Driver cannot be loaded
VIDEO PORT is not enabledData Flow path from CCDC is disabled
Davinci AF driver cannot be loaded
VIDEO PORT is not enabled
CCDC needs to be configured<6>i2c /dev entries driver
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
MUX: initialized HDIREN
MUX: initialized ATAEN
ide0: MMIO-DMA , BIOS settings: hda:pio, hdb:pio
Palm Chip BK3710 IDE Register Fail
Initializing USB Mass Storage driver...
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.6:USB HID core driver
musb_hdrc: version 6.0, cppi-dma, host, debug=0
musb_hdrc musb_hdrc: No DMA interrupt line
musb_hdrc: USB Host mode controller at c405e000 using DMA, IRQ 12
musb_hdrc musb_hdrc: MUSB HDRC host driver
musb_hdrc musb_hdrc: new USB bus registered, assigned bus number 1
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
mice: PS/2 mouse device common for all mice
rtc_davinci_evm rtc_davinci_evm: rtc intf: proc
rtc_davinci_evm rtc_davinci_evm: rtc intf: dev (254:0)
rtc_davinci_evm rtc_davinci_evm: rtc core: registered rtc_davinci_evm as rtc0
rtc0: hours 12-23 are misreported as duplicate hours 00-11
davinci-mmc davinci-mmc.0: Supporting 4-bit mode
davinci-mmc davinci-mmc.0: Using DMA mode
Advanced Linux Sound Architecture Driver Version 1.0.12rc1 (Thu Jun 22 13:55:50 2006 UTC).
ASoC version 0.13.1
MUX: initialized MCBSP
AIC3X Audio Codec 0.1
ALSA device list:
No soundcards found.
IPv4 over IPv4 tunneling driver
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
Time: timer0_1 clocksource has been installed.
Clock event device timer0_0 configured with caps set: 08
Switched to high resolution mode on CPU 0
rtc_davinci_evm rtc_davinci_evm: hctosys: invalid date/time
Sending DHCP requests ...... timed out!
IP-Config: Retrying forever (NFS root)...
TI的专家们，麻烦你们抽空看看这是什么原因导致的呢，u-boot并没有改动的，只是uImage是编译的新的，并放在了/tftp的根目录下，但是我将原来的那个uImage，采用同上面的方式下载并启动nfs，是可以的。但一换成这个新的uImage，就出现了上述错误。
还有，上面的板子的ip采用的是dhcp动态配置。有一个非常疑惑的问题，即使我将setenv bootargs中的ip=dhcp换成静态配置（其参数的格式为 ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>），仍然不行，还是会出现Sending DHCP requests ...... timed out!的错误，很奇怪，明明已经设置成静态的了，为什么还会出现dhcp为板子配置ip呢？
望大家帮我看看吧，谢谢~