kernel panic -not syncing: VFS unable to mount root fs on unknown -block(0,0)

```

hi all, i am booting android ics in beagle board xm, after running the script
file
partions in sdcard has been made and when i put the sdcard in beaglexm and
connected the xm to the host pc and observed the booting process in the
hyperterminal...during booting it says

kernel panic ...not syncing..

Wednesday 19 December 2012
[11:01:05 AM] * rs sent file beagle booting.docx.
[11:52:05 AM] rs:

2745172 bytes read

***** Kernel: /dev/mmcblk0p1/uImage *****

***** RootFS: /dev/mmcblk0p2 *****

## Booting kernel from Legacy Image at 82000000 ...

Image Name: Linux-2.6.37-g06ebbba

Image Type: ARM Linux Kernel Image (uncompressed)

Data Size: 2745108 Bytes = 2.6 MiB

Load Address: 80008000

Entry Point: 80008000

Verifying ... OK

Loading Kernel Image ... OK

OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.

Linux version 2.6.37-g06ebbba (a0131746@swubn01) (gcc version 4.4.3 (GCC) ) #1 F

ri Jul 8 04:28:11 IST 2011

CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7f

CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache

Machine: OMAP3 Beagle Board

Reserving 8388608 bytes SDRAM for VRAM

Memory policy: ECC disabled, Data cache writeback

OMAP3630 ES1.2 (l2cache iva sgx neon isp 192mhz_clk )

SRAM: Mapped pa 0x40200000 to va 0xfe400000 size: 0x10000

Built 1 zonelists in Zone order, mobility grouping on. Total pages: 62976

Kernel command line: console=ttyO2,115200n8 androidboot.console=ttyO2 mem=256M r

oot=/dev/mmcblk0p2 rw rootfstype=ext3 rootdelay=1 init=/init ip=off omap_vout.vi

d1_static_vrfb_alloc=y vram=8M omapfb.vram=0:8M omapdss.def_disp=dvi omapfb.mode

=dvi:1024x768-16

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: 248MB = 248MB total

Memory: 245300k/245300k available, 16844k 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)

modules : 0xbf000000 - 0xc0000000 ( 16 MB)

.init : 0xc0008000 - 0xc003b000 ( 204 kB)

.text : 0xc003b000 - 0xc052f000 (5072 kB)

.data : 0xc0530000 - 0xc0574940 ( 275 kB)

NR_IRQS:409

Clocking rate (Crystal/Core/MPU): 26.0/400/600 MHz

Reprogramming SDRC clock to 400000000 Hz

dpll3_m2_clk rate change failed: -22

IRQ: Found an INTC at 0xfa200000 (revision 4.0) with 96 interrupts

Total of 96 interrupts on 1 active controller

GPMC revision 5.0

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 interrupt handler for IRQ407

Trying to install interrupt handler for IRQ408

Trying to install type control for IRQ409

Trying to set irq flags for IRQ409

OMAP clockevent source: GPTIMER1 at 32768 Hz

Console: colour dummy device 80x30

Calibrating delay loop... 597.64 BogoMIPS (lpj=2334720)

pid_max: default: 32768 minimum: 301

Security Framework initialized

Mount-cache hash table entries: 512

CPU: Testing write buffer coherency: ok

regulator: core version 0.5

regulator: dummy:

NET: Registered protocol family 16

OMAP GPIO hardware version 2.5

OMAP GPIO hardware version 2.5

OMAP GPIO hardware version 2.5

OMAP GPIO hardware version 2.5

OMAP GPIO hardware version 2.5

OMAP GPIO hardware version 2.5

omap_mux_init: Add partition: #1: core, flags: 0

OMAP3 Beagle Rev: xM C

Found NAND on CS0

Registering NAND on CS0

Unable to get DVI reset GPIO

hw-breakpoint: debug architecture 0x4 unsupported.

OMAP DMA hardware revision 5.0

bio: create slab at 0

SCSI subsystem initialized

usbcore: registered new interface driver usbfs

usbcore: registered new interface driver hub

usbcore: registered new device driver usb

omap_device: omap_i2c.1: new worst case activate latency 0: 30517

omap_i2c omap_i2c.1: bus 1 rev4.0 at 2600 kHz

twl4030: PIH (irq 7) chaining IRQs 368..375

twl4030: power (irq 373) chaining IRQs 376..383

twl4030: gpio (irq 368) chaining IRQs 384..401

regulator: VUSB1V5: 1500 mV normal standby

regulator: VUSB1V8: 1800 mV normal standby

regulator: VUSB3V1: 3100 mV normal standby

twl4030_usb twl4030_usb: Initialized TWL4030 USB module

regulator: VMMC1: 1850 <--> 3150 mV at 3000 mV normal standby

regulator: VDAC: 1800 mV normal standby

regulator: VDVI: 1800 mV normal standby

regulator: VSIM: 1800 <--> 3000 mV at 1800 mV normal standby

regulator: VAUX3: 1800 mV normal standby

regulator: VAUX4: 1800 mV normal standby

omap_device: omap_i2c.1: new worst case deactivate latency 0: 30517

omap_i2c omap_i2c.2: bus 2 rev4.0 at 400 kHz

omap_i2c omap_i2c.3: bus 3 rev4.0 at 100 kHz

Advanced Linux Sound Architecture Driver Version 1.0.23.

Switching to clocksource 32k_counter

musb-hdrc: version 6.0, otg (peripheral+host), debug=0

musb-hdrc musb-hdrc.0: dma type: dma-inventra

musb-hdrc musb-hdrc.0: USB OTG mode controller at fa0ab000 using DMA, IRQ 92

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

NetWinder Floating Point Emulator V0.97 (double precision)

omap-iommu omap-iommu.0: isp registered

AM37x/DM37x Linux PSP version 04.02.00.07 (OMAP3BEAGLE)

ashmem: initialized

VFS: Disk quotas dquot_6.5.2

Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)

JFFS2 version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.

msgmni has been set to 479

io scheduler noop registered

io scheduler deadline registered

io scheduler cfq registered (default)

OMAP DSS rev 2.0

OMAP DISPC rev 3.0

OMAP VENC rev 2

OMAP DSI rev 1.0

Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled

omap_uart.0: ttyO0 at MMIO 0x4806a000 (irq = 72) is a OMAP UART0

omap_uart.1: ttyO1 at MMIO 0x4806c000 (irq = 73) is a OMAP UART1

omap_uart.2: ttyO2 at MMIO 0x49020000 (irq = 74) is a OMAP UART2

console [ttyO2] enabled

omap_uart.3: ttyO3 at MMIO 0x49042000 (irq = 80) is a OMAP UART3

brd: module loaded

loop: module loaded

mtdoops: mtd device (mtddev=name/number) must be supplied

omap2-nand driver initializing

No NAND device found.

No NAND device found.

OneNAND driver initializing

usbcore: registered new interface driver asix

usbcore: registered new interface driver cdc_ether

usbcore: registered new interface driver smsc95xx

usbcore: registered new interface driver net1080

usbcore: registered new interface driver cdc_subset

usbcore: registered new interface driver zaurus

ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver

ehci-omap.0 supply hsusb0 not found, using dummy regulator

ehci-omap.0 supply hsusb1 not found, using dummy regulator

ehci-omap ehci-omap.0: OMAP-EHCI Host Controller

ehci-omap ehci-omap.0: new USB bus registered, assigned bus number 1

ehci-omap ehci-omap.0: irq 77, io mem 0x48064800

ehci-omap ehci-omap.0: USB 2.0 started, EHCI 1.00

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: OMAP-EHCI Host Controller

usb usb1: Manufacturer: Linux 2.6.37-g06ebbba ehci_hcd

usb usb1: SerialNumber: ehci-omap.0

hub 1-0:1.0: USB hub found

hub 1-0:1.0: 3 ports detected

Initializing USB Mass Storage driver...

usbcore: registered new interface driver usb-storage

USB Mass Storage support registered.

android init

android_probe pdata: c053ff2c

android_bind

android_usb gadget: android_usb ready

musb-hdrc musb-hdrc.0: MUSB HDRC host driver

musb-hdrc musb-hdrc.0: 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..
smsc95xx v1.0.4

smsc95xx 1-2.1:1.0: usb0: register 'smsc95xx' at usb-ehci-omap.0-2.1, smsc95xx U

SB 2.0 Ethernet, 3a:42:f6:67:41:d5

VFS: Cannot open root device "mmcblk0p2" or unknown-block(0,0)

Please append a correct "root=" boot option; here are the available partitions:

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

Backtrace:

[] (dump_backtrace+0x0/0x110) from [] (dump_stack+0x18/0x1c)

r7:c0030abc r6:00008000 r5:c05759e8 r4:c05759e8

[] (dump_stack+0x0/0x1c) from [] (panic+0x64/0x180)

[] (panic+0x0/0x180) from [] (mount_block_root+0x260/0x2b0)

r3:00000000 r2:00000000 r1:cf01bf58 r0:c04b2fbc

[] (mount_block_root+0x0/0x2b0) from [] (mount_root+0x54/0x6

8)

[] (mount_root+0x0/0x68) from [] (prepare_namespace+0x16c/0x

1c4)

r5:c0030ad1 r4:c05749a4

[] (prepare_namespace+0x0/0x1c4) from [] (kernel_init+0x114/

0x154)

r5:c0030094 r4:c0574940

[] (kernel_init+0x0/0x154) from [] (do_exit+0x0/0x638)

r5:c00083a8 r4:00000000

required an immediate help

thanks
raj
rajkumar@clitetechnologies.com
```

Original issue reported on code.google.com by `rajku...@clitetechnologies.com` on 19 Dec 2012 at 6:29

Start with the supplied boot log, especially the kernel command line, the /dev/mmcblk0p2 root setting, and the reported partitioning and boot steps. The issue does not name a repository file, test, or concrete code change, so a valid completion criterion would need to be established before implementation.

Written by the indexing model from the issue text.