Kernel panic not syncing VFS: Unable to mount root fs on unknown-block(3,1)

Could you attach the bootup log and u-boot boot parameters here.

I presume that you are trying to boot DM6446 EVM through hard disk.
If that's the case, you can't use YAFFS2 filesystem since it is dedicated for flash devices like NAND,NOR etc.,

Are you trying to boot EVM board with YAFFS2 mode ?

If not, share your u-boot boot parameters.

thank you for reply,
it was working for several days but now i get this error

U-Boot 1.1.3 (Jun 16 2009 - 11:14:39)

U-Boot code: 81080000 -> 810975E0 BSS: -> 8109FFD0
RAM Configuration:
Bank #0: 80000000 256 MB
MY AMD Flash: 16 MB
In: serial
Out: serial
Err: serial
ARM Clock :- 297MHz
DDR Clock :- 162MHz
*****************************************************
*TECHSHINE*
*****************************************************
Hit any key to stop autoboot: 0
## Booting image at 02060000 ...
Image Name: Linux-2.6.10_mvl401-davinci_evm
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1297860 Bytes = 1.2 MB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
OK

Starting kernel ...

Uncompressing Lin...............................................................
....................... done, booting t Linux version 2.6.10_mvl401-davinci_evm
(root@localhost.localdomain) (gcc version 3.4.3 (MontaVista 3.4.3-25.0.30.050113
1 2005-07-23)) #42 Fri Sep 19 20:02:52 CST 2008
CPU: ARM926EJ-Sid(wb) [41069265] revision 5 (ARMv5TEJ)
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
Machine: DaVinci EVM
Memory policy: ECC disabled, Data cache writeback
Built 1 zonelists
Kernel command line: mem=120M console=ttyS0,57600n8 video=dm64xxfb:interface=com
posite:mode=ntsc:output=ntsc root=/dev/hda1 rw eth=00:0E:FF:FF:FF:85 ip=192.168.
1.2::192.168.1.3 nfsroot=192.168.1.3:/home/filesys,nolock
TI DaVinci EMAC: Kernel Boot params Eth address: 00:0E:FF:FF:FF:85
PID hash table entries: 512 (order: 9, 8192 bytes)
Console: colour dummy device 80x30
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 120MB = 120MB total
Memory: 118912KB available (2226K code, 473K data, 132K init)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
CPU: Testing write buffer coherency: ok
spawn_desched_task(00000000)
desched cpu_callback 3/00000000
ksoftirqd started up.
desched cpu_callback 2/00000000
desched thread 0 started up.
NET: Registered protocol family 16
Registering platform device 'nor_davinci.0'. Parent at platform
Registering platform device 'nand_davinci.0'. Parent at platform
DaVinci I2C DEBUG: 19:57:22 Sep 19 2008
Registering platform device 'i2c'. Parent at platform
JFFS2 version 2.2. (NAND) (C) 2001-2003 Red Hat, Inc.
yaffs Aug 6 2008 09:46:39 Installing.
Registering platform device 'davincifb.0'. Parent at platform
Console: switching to colour frame buffer device 90x30
Registering platform device 'davinci_resizer.2'. Parent at platform
Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled
Registering platform device 'serial8250'. Parent at platform
ttyS0 at MMIO 0x1c20000 (irq = 40) is a 16550A
io scheduler noop registered
io scheduler anticipatory registered
RAMDISK driver initialized: 1 RAM disks of 32768K size 1024 blocksize
Registering platform device 'ti_davinci_emac'. Parent at platform
DaVinci EMAC: Unable to read MAC from EEPROM, no i2c support in kernel.
TI DaVinci EMAC: MAC address is 00:0E:FF:FF:FF:85
TI DaVinci EMAC Linux version updated 4.0
TI DaVinci EMAC: Installed 1 instances.
netconsole: not configured, aborting
i2c /dev entries driver
Linux video capture interface: v1.00
Registering platform device 'vpfe.1'. Parent at platform
DaVinci v4l2 capture driver V1.0 loaded
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
hda: SAMSUNG HM061GC, ATA DISK drive
elevator: using anticipatory as default io scheduler
ide0 at 0xe10661f0-0xe10661f7,0xe10663f6 on irq 22
hda: max request size: 1024KiB
hda: 117231408 sectors (60022 MB) w/8192KiB Cache, CHS=16383/255/63
hda: hda1
ide0: BM-DMA at 0xe1066000-0xe1066007, BIOS settings: hda:pio, hdb:pio
mice: PS/2 mouse device common for all mice
Registering platform device 'davinci-audio.0'. Parent at platform
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 8192 bind 16384)
NET: Registered protocol family 1
NET: Registered protocol family 17
IP-Config: Guessing netmask 255.255.255.0
IP-Config: Complete:
device=eth0, addr=192.168.1.2, mask=255.255.255.0, gw=192.168.1.3,
host=192.168.1.2, domain=, nis-domain=(none),
bootserver=255.255.255.255, rootserver=192.168.1.3, rootpath=
yaffs: dev is 3145729 name is "hda1"
yaffs: Attempting MTD mount on 3.1, "hda1"
yaffs: dev is 3145729 name is "hda1"
yaffs: Attempting MTD mount on 3.1, "hda1"
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(3,1)

Hi Sisia,

Kernel command line: mem=120M console=ttyS0,57600n8 video=dm64xxfb:interface=com
posite:mode=ntsc:output=ntsc root=/dev/hda1 rw eth=00:0E:FF:FF:FF:85 ip=192.168.
1.2::192.168.1.3 nfsroot=192.168.1.3:/home/filesys,nolock
TI DaVinci EMAC: Kernel Boot params Eth address: 00:0E:FF:FF:FF:85

The u-boot parameter seems to be wrong that you are trying to boot the through NFS but using "/dev/hda" drive.
Try the following either bootargs.

1) setenv bootargs 'mem=120M console=ttyS0,57600n8 video=dm64xxfb:interface=composite:mode=ntsc:output=ntsc root=/dev/nfs rw eth=00:0E:FF:FF:FF:85 ip=192.168.1.2::192.168.1.3 nfsroot=192.168.1.3:/home/filesys,nolock'

2) setenv bootargs 'mem=120M console=ttyS0,57600n8 video=dm64xxfb:interface=composite:mode=ntsc:output=ntsc root=/dev/hda1 rw eth=00:0E:FF:FF:FF:85 ip=192.168.1.2::192.168.1.3'

hi Titusrathinaraj, 

i've tried these command and when i try to boot i get this message : Unkonwn command 'mem=120M' -try help 

for help: 

autoscr - run script from memory

base    - print or set address offset

bdinfo  - print Board Info structure

boot    - boot default, i.e., run 'bootcmd'

bootd   - boot default, i.e., run 'bootcmd'

bootm   - boot application image from memory

bootp   - boot image via network using BootP/TFTP protocol

cmp     - memory compare

coninfo - print console devices and information

cp      - memory copy

crc32   - checksum calculation

dhcp    - invoke DHCP client to obtain IP/boot params

echo    - echo args to console

erase   - erase FLASH memory

flinfo  - print FLASH memory information

go      - start application at address 'addr'

help    - print online help

iminfo  - print header information for application image

imls    - list all images found in flash

itest   - return true/false on integer compare

loadb   - load binary file over serial line (kermit mode)

loads   - load S-Record file over serial line

loop    - infinite loop on address range

md      - memory display

mm      - memory modify (auto-incrementing)

mtest   - simple RAM test

mw      - memory write (fill)

nfs     - boot image via network using NFS protocol

nm      - memory modify (constant address)

ping    - send ICMP ECHO_REQUEST to network host

printenv- print environment variables

protect - enable or disable FLASH write protection

rarpboot- boot image via network using RARP/TFTP protocol

reset   - Perform RESET of the CPU

run     - run commands in an environment variable

saveenv - save environment variables to persistent storage

setenv  - set environment variables

sleep   - delay execution for some time

tftpboot- boot image via network using TFTP protocol

version - print monitor version

hope you help me for solving this problem

best regards 

Hi,

Apologize, some type here.
Try now.

1) setenv bootargs 'mem=120M console=ttyS0,57600n8 video=dm64xxfb:interface=composite:mode=ntsc:output=ntsc root=/dev/nfs rw eth=00:0E:FF:FF:FF:85 ip=192.168.1.2::192.168.1.3 nfsroot=192.168.1.3:/home/filesys,nolock'

2) setenv bootargs 'mem=120M console=ttyS0,57600n8 video=dm64xxfb:interface=composite:mode=ntsc:output=ntsc root=/dev/hda1 rw eth=00:0E:FF:FF:FF:85 ip=192.168.1.2::192.168.1.3'

hi TituS, i still have that probem when i put the first command i get this error :

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

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

and for the second command i get the same error that i have for the first time! i'm new in linux i saw this link  

e2e.ti.com/.../110353

but i'm still confused about how to solve this problem

best regards