AM 1808: Kernel panic - not syncing: VFS: Unable to mount root fs

Dear all,

I'm working on the AM1808 eXperimenter Kit.

During booting the kernel, it seems that mounting file system via NFS failed. i got the following message: "Kernel panic - not syncing: VFS: Unable to mount root".

I'm using "DaVinci-PSP-SDK-03.20.00.14". my desktop machine is Ubuntu 11.04 - Natty Narwhal .

please advice

Nissim.

Desktop NFS configuration:

1. /etc/default/nfs-kernel-server:

# Number of servers to start up
RPCNFSDCOUNT=8

# Runtime priority of server (see nice(1))
RPCNFSDPRIORITY=0

# Options for rpc.mountd.
# If you have a port-based firewall, you might want to set up
# a fixed port here using the --port option. For more information,
# see rpc.mountd(8) or http://wiki.debian.org/?SecuringNFS
RPCMOUNTDOPTS=--manage-gids

# Do you want to start the svcgssd daemon? It is only required for Kerberos
# exports. Valid alternatives are "yes" and "no"; the default is "no".
NEED_SVCGSSD=no

# Options for rpc.svcgssd.
RPCSVCGSSDOPTS=

2. /etc/default/nfs-common

# If you do not set values for the NEED_ options, they will be attempted
# autodetected; this should be sufficient for most people. Valid alternatives
# for the NEED_ options are "yes" and "no".

# Do you want to start the statd daemon? It is not needed for NFSv4.
NEED_STATD=

# Options for rpc.statd.
#   Should rpc.statd listen on a specific port? This is especially useful
#   when you have a port-based firewall. To use a fixed port, set this
#   this variable to a statd argument like: "--port 4000 --outgoing-port 4001".
#   For more information, see rpc.statd(8) or http://wiki.debian.org/?SecuringNFS
STATDOPTS=

# Do you want to start the idmapd daemon? It is only needed for NFSv4.
NEED_IDMAPD=yes

# Do you want to start the gssd daemon? It is required for Kerberos mounts.
NEED_GSSD=no

3. /etc/exports

/home/nissim/Projects/TI_AM1808/workdir/filesys 192.168.1.2/24 (rw,fsid=0,insecure,no_subtree_check,async)

Target printenv:

bootdelay=3
baudrate=115200
ethaddr=00:08:EE:03:DD:12
ipaddr=192.168.1.1
netmask=255.255.255.0
serverip=192.168.1.2
nfshost=192.168.1.2
bootfile=uImage
bootcmd=tftp;bootm
rootpath=/home/nissim/Projects/TI_AM1808/workdir/filesys
bootargs=console=ttyS2,115200n8 noinitrd rw ip=192.168.1.1 root=/dev/nfs nfsroot=192.168.1.2:/home/nissim/Projects/TI_AM1808/workdir/filesys,nolock mem=32M
stdin=serial
stdout=serial
stderr=serial
ver=U-Boot 2009.11 (Nov 09 2010 - 18:48:43)

Environment size: 476/65532 bytes

Target log output:

Booting with TI UBL
Device OPP (300MHz, 1.2V)

U-Boot 2009.11 (Nov 09 2010 - 18:48:43)

I2C:   ready
DRAM:  64 MB
MMC:   davinci: 0
In:    serial
Out:   serial
Err:   serial
ARM Clock : 300000000 Hz
DDR Clock : 132000000 Hz
Net:   Ethernet PHY: GENERIC @ 0x00

Hit any key to stop autoboot:  0
Using  device
TFTP from server 192.168.1.2; our IP address is 192.168.1.1
Filename 'uImage'.
Load address: 0xc0700000
Loading: #################################################################
         #################################################################
         ##############
done
Bytes transferred = 2113744 (2040d0 hex)
## Booting kernel from Legacy Image at c0700000 ...
   Image Name:   Linux-2.6.33-rc4
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2113680 Bytes =  2 MB
   Load Address: c0008000
   Entry Point:  c0008000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Linux version 2.6.33-rc4 (x0029463@psplinux051) (gcc version 4.3.3 (Sourcery G++ Lite 2009q1-203) ) #1 PREEMPT Tue Nov 9 18:59:15 IST 2010
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: DaVinci DA850/OMAP-L138/AM18xx EVM
Memory policy: ECC disabled, Data cache writeback
DaVinci da850/omap-l138 variant 0x0
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 8128
Kernel command line: console=ttyS2,115200n8 noinitrd rw ip=192.168.1.1 root=/dev/nfs nfsroot=192.168.1.2:/home/nissim/Projects/TI_AM1808/workdir/filesys,nolock mem=32M
PID hash table entries: 128 (order: -3, 512 bytes)
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 32MB = 32MB total
Memory: 27972KB available (4012K code, 315K data, 148K init, 0K highmem)
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Hierarchical RCU implementation.
NR_IRQS:245
Console: colour dummy device 80x30
Calibrating delay loop... 149.50 BogoMIPS (lpj=747520)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
DaVinci: 144 gpio irqs
regulator: core version 0.5
NET: Registered protocol family 16
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
regulator: VDCDC1: 3200 <--> 3300 mV at 3300 mV
regulator: VDCDC2: 1750 <--> 3300 mV at 3300 mV
regulator: VDCDC3: 950 <--> 1375 mV at 1200 mV
regulator: LDO1: 1800 mV
regulator: LDO2: 1150 <--> 1300 mV at 1200 mV
pca953x 1-0020: failed reading register
i2c-gpio i2c-gpio.1: using pins 20 (SDA) and 21 (SCL)
Switching to clocksource timer0_1
musb_hdrc: version 6.0, cppi4.1-dma, host, debug=0
Waiting for USB PHY clock good...
musb_hdrc: USB Host mode controller at fee00000 using DMA, IRQ 58
musb_hdrc musb_hdrc: MUSB HDRC host driver
musb_hdrc musb_hdrc: new USB bus registered, assigned bus number 1
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 1024 (order: 1, 8192 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
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.
EMAC: MII PHY configured, RMII PHY will not be functional
JFFS2 version 2.2. (NAND) �© 2001-2006 Red Hat, Inc.
msgmni has been set to 54
io scheduler noop registered (default)
da8xx_lcdc da8xx_lcdc.0: GLCD: Found Sharp_LK043T1DG01 panel
Console: switching to colour frame buffer device 60x34
Serial: 8250/16550 driver, 3 ports, IRQ sharing disabled
serial8250.0: ttyS0 at MMIO 0x1c42000 (irq = 25) is a 16550A
serial8250.0: ttyS1 at MMIO 0x1d0c000 (irq = 53) is a 16550A
serial8250.0: ttyS2 at MMIO 0x1d0d000 (irq = 61) is a 16550A
console [ttyS2] enabled
brd: module loaded
ahci ahci: forcing PORTS_IMPL to 0x1
ahci ahci: AHCI 0001.0100 32 slots 1 ports 3 Gbps 0x1 impl SATA mode
ahci ahci: flags: ncq sntf pm led clo only pmp pio slum part ccc
scsi0 : ahci
ata1: SATA max UDMA/133 irq 67
spi_davinci spi_davinci.1: DaVinci SPI driver in EDMA mode
Using RX channel = 18 , TX channel = 19 and event queue = 1
m25p80 spi1.0: m25p64 (8192 Kbytes)
Creating 4 MTD partitions on "m25p80":
0x000000000000-0x000000040000 : "U-Boot"
0x000000040000-0x000000050000 : "U-Boot Environment"
0x000000050000-0x0000007f0000 : "Linux"
0x0000007f0000-0x000000800000 : "MAC Address"
Read MAC addr from EEPROM: ff:ff:ff:ff:ff:ff
spi_davinci spi_davinci.1: Controller at 0xfef0e000
console [netcon0] enabled
netconsole: network logging started
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
ohci ohci.0: DA8xx OHCI
ohci ohci.0: new USB bus registered, assigned bus number 2
ohci ohci.0: irq 59, io mem 0x01e25000
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
input: TPS6507x Touchscreen as /devices/platform/i2c-gpio.1/i2c-1/1-0048/input/input0
omap_rtc omap_rtc: rtc core: registered omap_rtc as rtc0
omap_rtc: RTC power up reset detected
i2c /dev entries driver
Linux video capture interface: v2.00
usbcore: registered new interface driver uvcvideo
USB Video Class driver (v0.1.0)
watchdog watchdog: heartbeat 60 sec
cpuidle: using governor ladder
cpuidle: using governor menu
davinci_mmc davinci_mmc.0: Using DMA, 4-bit mode
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
Advanced Linux Sound Architecture Driver Version 1.0.21.
usbcore: registered new interface driver snd-usb-audio
No device for DAI tlv320aic3x
asoc: tlv320aic3x <-> davinci-i2s mapping ok
ALSA device list:
  #0: DA850/OMAP-L138 EVM (tlv320aic3x)
TCP cubic registered
NET: Registered protocol family 17
Clocks: disable unused emac
Clocks: disable unused aemif
Clocks: disable unused spi0
ata1: SATA link down (SStatus 0 SControl 300)
regulator_init_complete: incomplete constraints, leaving LDO2 on
regulator_init_complete: incomplete constraints, leaving LDO1 on
regulator_init_complete: incomplete constraints, leaving VDCDC3 on
regulator_init_complete: incomplete constraints, leaving VDCDC2 on
regulator_init_complete: incomplete constraints, leaving VDCDC1 on
davinci_emac_probe: using random MAC addr: 4a:d0:1c:17:62:01
emac-mii: probed
omap_rtc omap_rtc: setting system clock to 2000-01-01 00:00:00 UTC (946684800)
eth0: attached PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=1:00, id=7c0f1)
IP-Config: Guessing netmask 255.255.255.0
IP-Config: Complete:
     device=eth0, addr=192.168.1.1, mask=255.255.255.0, gw=255.255.255.255,
     host=192.168.1.1, domain=, nis-domain=(none),
     bootserver=255.255.255.255, rootserver=192.168.1.2, rootpath=
Looking up port of RPC 100003/2 on 192.168.1.2
PHY: 1:00 - Link is Up - 100/Full
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 192.168.1.2
Root-NFS: Unable to get mountd port number from server, using default
Root-NFS: Server returned error -110 while mounting /home/nissim/Projects/TI_AM1808/workdir/filesys
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              64 mtdblock1 (driver?)
1f02            7808 mtdblock2 (driver?)
1f03              64 mtdblock3 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Backtrace:
[<c0031730>] (dump_backtrace+0x0/0x114) from [<c0320420>] (dump_stack+0x18/0x1c)
 r7:00008000 r6:c1c13000 r5:c0025a08 r4:c0446f38
[<c0320408>] (dump_stack+0x0/0x1c) from [<c0320488>] (panic+0x64/0x13c)
[<c0320424>] (panic+0x0/0x13c) from [<c0008fec>] (mount_block_root+0x1e0/0x220)
 r3:00000001 r2:00000001 r1:c1c23f60 r0:c03b5856
[<c0008e0c>] (mount_block_root+0x0/0x220) from [<c00090f0>] (mount_root+0xc4/0xfc)
 r8:00000000 r7:00000000 r6:00000000 r5:00000000 r4:00200000
[<c000902c>] (mount_root+0x0/0xfc) from [<c0009298>] (prepare_namespace+0x170/0x1c8)
 r5:c0025a08 r4:c0446a20
[<c0009128>] (prepare_namespace+0x0/0x1c8) from [<c00084c8>] (kernel_init+0xf0/0x12c)
 r5:00000000 r4:c04467e0
[<c00083d8>] (kernel_init+0x0/0x12c) from [<c0045424>] (do_exit+0x0/0x6b4)
 r5:00000000 r4:00000000