用tftp烧写内核和文件系统能正常起来，通过nfs挂载出现问题，虚拟机nfs没问题，挂载文件系统到 /mnt 能成功，虚拟机和板子之间可以拼通，串口信息如下
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
Linux version 2.6.37_DM385_IPNC_3.50.00 (root@ubuntu) (gcc version 4.5.3 20110311 (prerelease) (GCC) ) #1 Mon Jul 28 14:19:24 CST 2014
CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7f
CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: dm385ipnc
vram size = 4194304 at 0x0
ti81xx_reserve: ### Reserved DDR region @84f00000
reserved size = 4194304 at 0x0
FB: Reserving 4194304 bytes SDRAM for VRAM
Memory policy: ECC disabled, Data cache writeback
OMAP chip is DM385 1.0
SRAM: Mapped pa 0x402f1000 to va 0xfe400000 size: 0xf000
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 19040
Kernel command line: console=ttyO0,115200n8 root=/dev/nfs rw mem=80M vram=4M nfsroot=192.168.1.148:/opt/dm385/Source/ipnc_rdk/target/filesys,nolock eth=$(ethaddr) ip=192.168.1.168 rootdelay=10
cpsw: kernel boot params Ethernet address: $(ethaddr)
PID hash table entries: 512 (order: -1, 2048 bytes)
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 74MB 1MB = 75MB total
Memory: 70676k/70676k available, 11244k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
vmalloc : 0xc5800000 - 0xf8000000 ( 808 MB)
lowmem : 0xc0000000 - 0xc5000000 ( 80 MB)
pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
.init : 0xc0008000 - 0xc003e000 ( 216 kB)
.text : 0xc003e000 - 0xc04ba000 (4592 kB)
.data : 0xc04ba000 - 0xc04fabc0 ( 259 kB)
SLUB: Genslabs=11, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS:375
IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts
Total of 128 interrupts on 1 active controller
GPMC revision 6.0
Trying to install interrupt handler for IRQ368
Trying to install interrupt handler for IRQ369
Trying to install interrupt handler for IRQ370
Trying to install interrupt handler for IRQ371
Trying to install interrupt handler for IRQ372
Trying to install interrupt handler for IRQ373
Trying to install interrupt handler for IRQ374
Trying to install type control for IRQ375
Trying to set irq flags for IRQ375
OMAP clockevent source: GPTIMER1 at 20000000 Hz
Console: colour dummy device 80x30
Calibrating delay loop... 599.65 BogoMIPS (lpj=2998272)
pid_max: default: 32768 minimum: 301
Security Framework initialized
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
devtmpfs: initialized
TI81XX: Map 0x84f00000 to 0xfe500000 for dram barrier
TI81XX: Map 0x40300000 to 0xfe600000 for sram barrier
omap_voltage_early_init: voltage driver support not added
regulator: core version 0.5
regulator: dummy:
NET: Registered protocol family 16
omap_voltage_domain_lookup: Voltage driver init not yet happened.Faulting!
omap_voltage_add_dev: VDD specified does not exist!
OMAP GPIO hardware version 0.1
OMAP GPIO hardware version 0.1
OMAP GPIO hardware version 0.1
OMAP GPIO hardware version 0.1
omap_mux_init: Add partition: #1: core, flags: 4
Cannot clk_get ck_32
Debugfs: Only enabling/disabling deep sleep and wakeup timer is supported now
registered ti81xx_vpss device
registered ti81xx_vidout device
registered ti81xx on-chip HDMI device
registered ti81xx_fb device
PWM0 init success.
PWM1 init success.
bio: create slab <bio-0> at 0
SCSI subsystem initialized
omap2_mcspi: probe of omap2_mcspi.3 failed with error -2
omap2_mcspi: probe of omap2_mcspi.4 failed with error -2
USBSS revision 4ea2080b
registerd cppi-dma Intr @ IRQ 17
Cppi41 Init Done
omap_i2c omap_i2c.1: bus 1 rev4.0 at 100 kHz
omap_i2c omap_i2c.1: controller timed out
tps65910 1-002d: read from reg 3f failed
omap_i2c omap_i2c.1: controller timed out
tps65910 1-002d: read from reg 1e failed
set_machine_constraints: failed to enable VRTC
tps65910 1-002d: failed to register tps65910-pmic regulator
tps65910-pmic: probe of tps65910-pmic failed with error -110
tps65911-rtc tps65911-rtc: rtc core: registered tps65911-rtc as rtc0
tps65910 1-002d: No interrupt support, no core IRQ
Advanced Linux Sound Architecture Driver Version 1.0.23.
Switching to clocksource gp timer
musb-hdrc: version 6.0, peripheral, debug=0
musb-hdrc musb-hdrc.0: dma type: dma-cppi41
MUSB controller-0 revision 4ea20800
usb2phy: computed values rxcalib(15)DACs(23 15 19)
usb2phy: override computed values rxcalib(15)DACs(23 15 19)
usb2phy_config: musb(0) rxcalib done, rxcalib read value 6f6bdf9e
musb-hdrc musb-hdrc.0: USB Peripheral mode controller at c581e000 using DMA, IRQ 18
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
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)
PMU: registered new PMU device of type 0
omap-iommu omap-iommu.0: ducati registered
omap-iommu omap-iommu.1: sys registered
JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
msgmni has been set to 138
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
CMEMK module: built on Jul 28 2014 at 14:11:15
Reference Linux version 2.6.37
File /opt/dm385/Source/ti_tools/linuxutils_3_23_00_01/packages/ti/sdo/linuxutils/cmem/src/module/cmemk.c
no physical memory specified, continuing with no memory allocation capability...
cmemk initialized
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
omap_uart.0: ttyO0 at MMIO 0x48020000 (irq = 72) is a OMAP UART0
console [ttyO0] enabled
omap_uart.1: ttyO1 at MMIO 0x48022000 (irq = 73) is a OMAP UART1
omap_uart.2: ttyO2 at MMIO 0x48024000 (irq = 74) is a OMAP UART2
brd: module loaded
loop: module loaded
omap2-nand driver initializing
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xca (Micron )
Creating 8 MTD partitions on "omap2-nand.0":
0x000000000000-0x000000020000 : "U-Boot-min"
0x000000020000-0x000000260000 : "U-Boot"
0x000000260000-0x000000280000 : "U-Boot Env"
0x000000280000-0x0000006c0000 : "Kernel"
0x0000006c0000-0x000006fc0000 : "File System"
0x000006fc0000-0x000007bc0000 : "Data"
0x000007bc0000-0x00000b0c0000 : "File System2"
0x00000b0c0000-0x000010000000 : "Reserved"
davinci_mdio davinci_mdio.0: davinci mdio revision 1.6
davinci_mdio davinci_mdio.0: detected phy mask fffffffe
davinci_mdio.0: probed
davinci_mdio davinci_mdio.0: phy[0]: device 0:00, driver unknown
mice: PS/2 mouse device common for all mice
i2c /dev entries driver
Linux video capture interface: v2.00
OMAP Watchdog Timer Rev 0x00: initial timeout 60 sec
notify_shm_drv: no DSP present (MULTIPROC_INVALIDID)
cm: Module associated with clock hdmi_i2s_fck didn't enable in 100000 tries
asoc: tlv320aic3x-hifi <-> davinci-mcasp.1 mapping ok
asoc: HDMI-DAI-CODEC <-> hdmi-dai mapping ok
ALSA device list:
#0: TI81XX EVM
nf_conntrack version 0.5.0 (1104 buckets, 4416 max)
ip_tables: (C) 2000-2006 Netfilter Core Team
TCP cubic registered
NET: Registered protocol family 17
Bridge firewalling registered
lib80211: common routines for IEEE802.11 drivers
Registering the dns_resolver key type
VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
omap_voltage_late_init: Voltage driver support not added
Power Management for TI81XX.
Detected MACID=0:e0:a:dd:0:0
omap_i2c omap_i2c.1: controller timed out
tps65911-rtc tps65911-rtc: hctosys: unable to read the hardware clock
CPSW phy found : id is : 0x4dd072
PHY 0:01 not found
IP-Config: Guessing netmask 255.255.255.0
IP-Config: Complete:
device=eth0, addr=192.168.1.168, mask=255.255.255.0, gw=255.255.255.255,
host=192.168.1.168, domain=, nis-domain=(none),
bootserver=255.255.255.255, rootserver=192.168.1.148, rootpath=
Waiting 10sec before mounting root device...
PHY: 0:00 - Link is Up - 1000/Full
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 128 mtdblock0 (driver?)
1f01 2304 mtdblock1 (driver?)
1f02 128 mtdblock2 (driver?)
1f03 4352 mtdblock3 (driver?)
1f04 107520 mtdblock4 (driver?)
1f05 12288 mtdblock5 (driver?)
1f06 54272 mtdblock6 (driver?)
1f07 81152 mtdblock7 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Backtrace:
[<c004bf70>] (dump_backtrace+0x0/0x110) from [<c038acac>] (dump_stack+0x18/0x1c)
r6:00008000 r5:c4768000 r4:c04fb758 r3:60000013
[<c038ac94>] (dump_stack+0x0/0x1c) from [<c038ad0c>] (panic+0x5c/0x178)
[<c038acb0>] (panic+0x0/0x178) from [<c0009184>] (mount_block_root+0x1c4/0x204)
r3:00000000 r2:00000000 r1:c4425f58 r0:c0443225
r7:c0443289
[<c0008fc0>] (mount_block_root+0x0/0x204) from [<c0009358>] (mount_root+0xac/0xcc)
[<c00092ac>] (mount_root+0x0/0xcc) from [<c00094e4>] (prepare_namespace+0x16c/0x1cc)
r4:c04fac24
[<c0009378>] (prepare_namespace+0x0/0x1cc) from [<c0008d70>] (kernel_init+0x114/0x154)
r5:c002d260 r4:c002d260
[<c0008c5c>] (kernel_init+0x0/0x154) from [<c0073430>] (do_exit+0x0/0x5d0)
r5:c0008c5c r4:00000000
大家帮忙看看，先谢谢啦。
