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

I would guess that your NFS came up faster than your network. The usual thing to try is adding rootdelay=5 to your bootargs. I see you have a U-boot rootdelay env variable but it has to be part of the bootargs variable.

One more problem I am seeing in the bootargs, netmask is not appending properly.

"Kernel command line: console=ttyO0,115200n8 root=/dev/nfs nfsroot=10.162.100.125:/opt/dm814x,nolock rw mem=256M ip=10.162.100.143:10.162.100.125:255.255.255f"

Regards

AnilKumar

Please mark this Forum post as answered via the Verify Answer button below if it helps answer your question.  Thanks!

It must be the linewrap error before:

This time I changed it to a private subnet and tried nfsboot, still the same problem:

TI8148_EVM#ping 192.168.0.10
link up on port 0, speed 1000, full duplex
Using cpsw device
host 192.168.0.10 is alive
TI8148_EVM#printenv
bootdelay=3
verify=yes
ramdisk_file=ramdisk.gz
loadaddr=0x81000000
script_addr=0x80900000
loadbootscript=fatload mmc 1 ${script_addr} boot.scr
bootscript= echo Running bootscript from MMC/SD to set the ENV...; source ${script_addr}
ethact=cpsw
filesize=29B
netdev=eth0
consoledev=ttyO0
baudrate=115200
ethaddr=90:d7:eb:c6:3d:66
bootfile=uImage
autoload=no
bootcmd=run addip; tftp 81000000 uImage;bootm
hostname=1dm8148
addip=setenv bootargs ${bootargs} ip=${ipaddr}:${nfsserver}:${netmask}:${hostname}:eth0:off
rootdelay=3
rootpath=/opt/dm814x
bootargs=console=ttyO0,115200 rootwait rw mem=256M earlyprintk notifyk.vpssm3_sva=0xBF900000 vram=50M ti814xfb.vram=0:16M,1:16M,2:6M root=/dev/nfs nfsroot=19
2.168.2.10:/opt/dm814x ip=192.168.2.15:192.168.2.10::255.255.255.0:1dm8148:eth0:off
serverip=192.168.0.10
ipaddr=192.168.0.15
nfsserver=192.168.0.10
netmask=255.255.255.0
nfsargs=setenv bootargs console=$consoledev,$baudrate rootdelay=7 rw mem=256M earlyprintk notifyk.vpssm3_sva=0xBF900000 vram=50M ti814xfb.vram=0:16M,1:16M,2:
6M root=/dev/nfs nfsroot=$serverip:$rootpath ip=${ipaddr}:${nfsserver}:${netmask}:${hostname}:eth0:off
nfsboot=run nfsargs;tftp $loadaddr $bootfile;bootm $loadaddr
stdin=serial
stdout=serial
stderr=serial
gatewayip=192.168.0.10

Environment size: 1257/8188 bytes
TI8148_EVM#run nfsboot
link up on port 0, speed 1000, full duplex
Using cpsw device
TFTP from server 192.168.0.10; our IP address is 192.168.0.15
Filename 'uImage'.
Load address: 0x81000000
Loading: T #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         ################################################
done
Bytes transferred = 2571428 (273ca4 hex)
## Booting kernel from Legacy Image at 81000000 ...
   Image Name:   Arago/2.6.37-psp04.01.00.06/dm81
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2571364 Bytes = 2.5 MiB
   Load Address: 80008000
   Entry Point:  80008000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Linux version 2.6.37 (x0029463@swubn01) (gcc version 4.3.3 (Sourcery G++ Lite 2009q1-203) ) #1 Fri Dec 9 17:17:52 IST 2011
CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7f
CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: ti8148evm
bootconsole [earlycon0] enabled
vram size = 52428800 at 0x0
reserved size = 52428800 at 0x0
FB: Reserving 52428800 bytes SDRAM for VRAM
Memory policy: ECC disabled, Data cache writeback
OMAP chip is TI8148 2.0
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 52224
Kernel command line: console=ttyO0,115200 rootdelay=7 rw mem=256M earlyprintk notifyk.vpssm3_sva=0xBF900000 vram=50M ti814xfb.vram=0:16M,1:16M,2:6M root=/dev
/nfs nfsroot=192.168.0.10:/opt/dm814x ip=192.168.0.15:192.168.0.10:255.255.255.0:1dm8148:eth0:off
PID hash table entries: 1024 (order: 0, 4096 bytes)
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 206MB = 206MB total
Memory: 203140k/203140k available, 59004k reserved, 0K highmem
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    DMA     : 0xffc00000 - 0xffe00000   (   2 MB)
    vmalloc : 0xd0800000 - 0xf8000000   ( 632 MB)
    lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
    pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
    modules : 0xbf000000 - 0xbfe00000   (  14 MB)
      .init : 0xc0008000 - 0xc003a000   ( 200 kB)
      .text : 0xc003a000 - 0xc04df000   (4756 kB)
      .data : 0xc04e0000 - 0xc0528640   ( 290 kB)
SLUB: Genslabs=11, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS:407
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 IRQ400
Trying to install interrupt handler for IRQ401
Trying to install interrupt handler for IRQ402
Trying to install interrupt handler for IRQ403
Trying to install interrupt handler for IRQ404
Trying to install interrupt handler for IRQ405
Trying to install interrupt handler for IRQ406
Trying to install type control for IRQ407
Trying to set irq flags for IRQ407
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
omap_voltage_early_init: voltage driver support not added
regulator: core version 0.5
regulator: dummy:
NET: Registered protocol family 16
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
registered ti814x_vpss device
registered TI814x on-chip HDMI device
NOR: Can't request GPMC CS
registered ti81xx_vidout device
Debugfs: Only enabling/disabling deep sleep and wakeup timer is supported now
ti81xx_pcie: Invoking PCI BIOS...
ti81xx_pcie: Setting up Host Controller...
ti81xx_pcie: Register base mapped @0xd0820000
ti81xx_pcie: Starting PCI scan...
PCI: bus0: Fast back to back transfers enabled
bio: create slab <bio-0> at 0
vgaarb: loaded
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
registerd cppi-dma Intr @ IRQ 17
Cppi41 Init Done
omap_i2c omap_i2c.1: bus 1 rev4.0 at 100 kHz
pcf857x: probe of 1-0021 failed with error -121
omap_i2c omap_i2c.3: bus 3 rev4.0 at 100 kHz
Advanced Linux Sound Architecture Driver Version 1.0.23.
Switching to clocksource gp timer
musb-hdrc: version 6.0, host, debug=0
musb-hdrc musb-hdrc.0: dma type: dma-cppi41
musb-hdrc musb-hdrc.0: MUSB HDRC host driver
musb-hdrc musb-hdrc.0: new USB bus registered, assigned bus number 1
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: MUSB HDRC host driver
usb usb1: Manufacturer: Linux 2.6.37 musb-hcd
usb usb1: SerialNumber: musb-hdrc.0
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
musb-hdrc musb-hdrc.0: USB Host mode controller at d081e000 using DMA, IRQ 18
musb-hdrc musb-hdrc.1: dma type: dma-cppi41
musb-hdrc musb-hdrc.1: MUSB HDRC host driver
musb-hdrc musb-hdrc.1: new USB bus registered, assigned bus number 2
usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb2: Product: MUSB HDRC host driver
usb usb2: Manufacturer: Linux 2.6.37 musb-hcd
usb usb2: SerialNumber: musb-hdrc.1
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
musb-hdrc musb-hdrc.1: USB Host mode controller at d0826800 using DMA, IRQ 19
NET: Registered protocol family 2
IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
TCP established hash table entries: 8192 (order: 4, 65536 bytes)
TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
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 396
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
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, bootconsole disabled
console [ttyO0] enabled, bootconsole disabled
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
omap_uart.3: ttyO3 at MMIO 0x481a6000 (irq = 44) is a OMAP UART3
omap_uart.4: ttyO4 at MMIO 0x481a8000 (irq = 45) is a OMAP UART4
omap_uart.5: ttyO5 at MMIO 0x481aa000 (irq = 46) is a OMAP UART5
brd: module loaded
loop: module loaded
ahci ahci.0: forcing PORTS_IMPL to 0x1
ahci ahci.0: AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1 impl platform mode
ahci ahci.0: flags: ncq sntf pm led clo only pmp pio slum part ccc apst
scsi0 : ahci_platform
ata1: SATA max UDMA/133 mmio [mem 0x4a140000-0x4a150fff] port 0x100 irq 16
omap2-nand driver initializing
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xca (Micron )
Creating 6 MTD partitions on "omap2-nand.0":
0x000000000000-0x000000020000 : "U-Boot-min"
0x000000020000-0x000000260000 : "U-Boot"
0x000000260000-0x000000280000 : "U-Boot Env"
0x000000280000-0x0000006c0000 : "Kernel"
0x0000006c0000-0x00000cee0000 : "File System"
0x00000cee0000-0x000010000000 : "Reserved"
davinci_mdio davinci_mdio.0: davinci mdio revision 1.6
davinci_mdio davinci_mdio.0: detected phy mask fffffffc
davinci_mdio.0: probed
davinci_mdio davinci_mdio.0: phy[0]: device 0:00, driver unknown
davinci_mdio davinci_mdio.0: phy[1]: device 0:01, driver unknown
usbcore: registered new interface driver cdc_ether
usbcore: registered new interface driver dm9601
usbcore: registered new interface driver cdc_acm
cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and ISDN adapters
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
mice: PS/2 mouse device common for all mice
qt602240_ts 1-004a: __qt602240_read_reg: i2c transfer failed
qt602240_ts: probe of 1-004a failed with error -5
omap_rtc omap_rtc: rtc core: registered omap_rtc as rtc0
i2c /dev entries driver
Linux video capture interface: v2.00
usbcore: registered new interface driver uvcvideo
USB Video Class driver (v1.0.0)
OMAP Watchdog Timer Rev 0x00: initial timeout 60 sec
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
notify_init : notify drivercreated  for  remote proc id 2 at physical Address 0xbf900000
usbcore: registered new interface driver snd-usb-audio
asoc: tlv320aic3x-hifi <-> davinci-mcasp.2 mapping ok
ALSA device list:
  #0: TI81XX EVM
TCP cubic registered
NET: Registered protocol family 17
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=90:d7:eb:c6:3d:66
omap_rtc omap_rtc: setting system clock to 2000-01-01 00:00:01 UTC (946684801)
ata1: SATA link down (SStatus 0 SControl 300)
mmc0: new SDHC card at address e624
mmcblk0: mmc0:e624 SD08G 7.40 GiB
 mmcblk0: p1 p2
Waiting 7sec before mounting root device...
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          204928 mtdblock4  (driver?)
1f05           50304 mtdblock5  (driver?)
b300         7761920 mmcblk0  driver: mmcblk
  b301           40131 mmcblk0p1 00000000-0000-0000-0000-000000000mmcblk0p1
  b302         7719232 mmcblk0p2 00000000-0000-0000-0000-000000000mmcblk0p2
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
Backtrace:
[<c0048b70>] (dump_backtrace+0x0/0x110) from [<c039dd84>] (dump_stack+0x18/0x1c)
 r7:ccb30000 r6:00000000 r5:c002da3c r4:c0528dd0
[<c039dd6c>] (dump_stack+0x0/0x1c) from [<c039dde8>] (panic+0x60/0x17c)
[<c039dd88>] (panic+0x0/0x17c) from [<c0009258>] (mount_block_root+0x1e0/0x220)
 r3:00000000 r2:00000000 r1:cc82bf58 r0:c0461acc
[<c0009078>] (mount_block_root+0x0/0x220) from [<c0009344>] (mount_root+0xac/0xcc)
[<c0009298>] (mount_root+0x0/0xcc) from [<c00094d4>] (prepare_namespace+0x170/0x1d4)
 r4:c05286a4
[<c0009364>] (prepare_namespace+0x0/0x1d4) from [<c0008784>] (kernel_init+0x114/0x154)
 r5:c0008670 r4:c0528640
[<c0008670>] (kernel_init+0x0/0x154) from [<c006e9bc>] (do_exit+0x0/0x5e4)
 r5:c0008670 r4:00000000

I am unable to figure out the reason for this failure and blocked on this.

Hi,

Can you go through this post?

http://e2e.ti.com/support/embedded/linux/f/354/t/160824.aspx#587146

Regards

AnilKumar

Please mark this Forum post as answered via the Verify Answer button below if it helps answer your question.  Thanks!

I did not closely enough at your bootlog. It's missing the the message about the CPSW phy and ifconfig. Something like.Your exact numbers will be different.

CPSW phy found : id is : 0x4dd074
CPSW phy found : id is : 0x4dd074
IP-Config: Complete:
     device=eth0, addr=192.168.0.15, mask=255.255.255.0, gw=,
     host=1dm8148, domain=, nis-domain=(none),
     bootserver=192.168.0.10, rootserver=192.168.0.10, rootpath=

With such a large root delay, the messages should have appeared. Double check that the network HW driver is enabled in your kernel config. I'm not familiar with the TI8148. I would guess you should look for a CPSW Phy driver.

Your "ip=" line appears to missing the gateway parameter. Linux doc has it defined as:

ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>

The U-Boot environment variables seem a bit confusing. Some places are have 192.168.2.x subnet while other places have 192.168.0.x subnet. The default bootargs has the .2. subnet and a correctly specified ip format (gateway is blank). The nfsargs has 192.168.0.x subnet and no gateway.

Hi 

I get exactly the same error as above (I don't get the phy detected messeges).
I need to use static ip (not dhcp),  
Maybe there is some problem with bootargs, which might result in linux not detecting the phy on kernel startup ? 

bootargs =  'console=ttyO0,115200n8 ip=${ipaddr}:{serverip}:255.255.255.255:ti814x:eth0:off nfsroot=${serverip}:${root_path} root=/dev/nfs rootdelay=15 rw earlyprintk notifyk.vpssm3_sva=0xBFD00000 mem=128M ddr_mem=512M vram=50M'

Thanks,

Ran

It was only a matter of wrong bootargs. strange that I did not caught it before.........

bootargs 'console=ttyO0,115200n8 root=/dev/nfs nfsroot=10.0.0.1:/mnt/DVR_NEW/DVRRDK_04.01.00.02/target/rfs_814x,nolock rw rootdelay=15 ip=10.0.0.2 earlyprintk notifyk.vpssm3_sva=0xBFD00000 mem=128M ddr_mem=512M vram=50M'

Thanks,
Ran