KERNEL: VFS: Cannot open root device "mmcblk0p2" or unknown-block(2,0)

Hi,

VFS: Cannot open root device "mmcblk0p2" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:

This args says that need to mount filesystem on SD card,

Could you please provide your boot args which is used at u-boot.

1) Do you have filesystem on micro SD card or SD card?

Hi  Titusrathinaraj:

     Thanks very much!

    1 boot args:

            setenv bootargs 'console=tty2,115200n8 noinitrd rw root=/dev/mmcblk0p2 mem=64M

     2  I had filesystem on my Micro SD card.I make it EXT3 types. And I can mount it to Ubuntu ok.

     What's problem? 

Hi,

            setenv bootargs 'console=tty2,115200n8 noinitrd rw root=/dev/mmcblk0p2 mem=64M

Try this "setenv bootargs 'console=tty2,115200n8 noinitrd rw rootfstype=ext3 root=/dev/mmcblk0p2 rootwait mem=64M"

/dev/mmcblk0p2

I think that you have created filesystem on 2nd partition (cross check)

Have you enabled "ext3" support in kernel configuration.

make menuconfig ARCH=arm CROSS_COMPILE=arm-arago-linux-gnueabi-

File systems  --->

<*> Ext3 journalling file system support

Hi Titusrathinaraj Stalin:

     Yes. I had enable it:

    Is other to config?

    Thanks very much!

Hi,

     2  I had filesystem on my Micro SD card.I make it EXT3 types. And I can mount it to Ubuntu ok.

Do you have a filesystem on SD card's 2nd partition?

Try this "setenv bootargs 'console=tty2,115200n8 noinitrd rw rootfstype=ext3 root=/dev/mmcblk0p2 rootwait mem=64M"

What about the results?

Are you facing same issue or different now?

Please let me know the results.

Hi Titusrathinaraj:

    Thanks.

    Yes. I created 2 partitions on my SD card.

  What's wrong?

Hi,

Please refer the following thread to boot and mount filesystem from SD card.

http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/327050.aspx

I hope it helps.

Hi Titusrathinaraj :

     Thanks very much!

     But according that, the problem exist yet.

     Can you help me to do it?

     Thanks.

Hi,

Can you please share your complete bootup logs, stpes & procedures what you have followed?

Please attach the logs and not a simple text paste on the thread,

Thanks for your understanding.

Hi Titusrathinaraj:

   Thanks.

   all log is:

Loading from NAND 256MiB 3,3V 8-bit, offset 0x300000
Image Name: Linux-2.6.33-rc4
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2124584 Bytes = 2 MB
Load Address: c0008000
Entry Point: c0008000
## Booting kernel from Legacy Image at c0700000 ...
Image Name: Linux-2.6.33-rc4
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2124584 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 (root@ubuntu) (gcc version 4.4.3 (ctng-1.6.1) ) #8 PREEMPT Mon Mar 17 09:59:50 HKT 2014
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/am18xx variant 0x1
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
Kernel command line: console=tty2,115200n8 noinitrd rw root=/dev/mmcblk0p2 mem=64M
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 60420KB available (3988K code, 312K 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
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
pca953x 1-0020: failed reading register
i2c-gpio i2c-gpio.1: using pins 20 (SDA) and 21 (SCL)
vpif vpif: vpif probe success
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: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
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) 漏 2001-2006 Red Hat, Inc.
msgmni has been set to 118
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
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: non-JEDEC variant of m25p64
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"
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.
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
adv7343 1-002a: chip found @ 0x54 (i2c-gpio1)
adv7343 1-002a: Error initializing
vpif_display vpif_display: Error registering v4l2 subdevice
vpif_display vpif_display: VPIF IRQ request failed
vpif_capture vpif_capture: Error registering v4l2 subdevice
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 i2c1
Clocks: disable unused emac
Clocks: disable unused aemif
Clocks: disable unused spi0
Clocks: disable unused mcbsp0
Clocks: disable unused mcbsp1
davinci_emac_probe: using random MAC addr: f2:50:ec:3c:64:7b
emac-mii: probed
omap_rtc omap_rtc: setting system clock to 2000-01-01 00:00:00 UTC (946684800)
Root-NFS: No NFS server available, giving up.
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "mmcblk0p2" 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:
[<c00316f4>] (dump_backtrace+0x0/0x114) from [<c031eaf8>] (dump_stack+0x18/0x1c)
r7:c03b1ebf r6:00008000 r5:c3812000 r4:c0441498
[<c031eae0>] (dump_stack+0x0/0x1c) from [<c031eb60>] (panic+0x64/0x134)
[<c031eafc>] (panic+0x0/0x134) from [<c0008fd4>] (mount_block_root+0x1d8/0x218)
r3:00000000 r2:00000001 r1:c3823f60 r0:c03b1f66
[<c0008dfc>] (mount_block_root+0x0/0x218) from [<c00090d8>] (mount_root+0xc4/0xfc)
[<c0009014>] (mount_root+0x0/0xfc) from [<c000927c>] (prepare_namespace+0x16c/0x1c4)
r5:c0026a1d r4:c0440f80
[<c0009110>] (prepare_namespace+0x0/0x1c4) from [<c00084c0>] (kernel_init+0xf0/0x12c)
r5:c00251d0 r4:c0440d40
[<c00083d0>] (kernel_init+0x0/0x12c) from [<c0045624>] (do_exit+0x0/0x6bc)
r5:00000000 r4:00000000

Hi Li

Titus Says said:

Please attach the logs and not a simple text paste on the thread,

I told you that do not put logs on thread directly, instead attach the logs,

Memory policy: ECC disabled, Data cache writeback
DaVinci da850/omap-l138/am18xx variant 0x1
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
Kernel command line: console=tty2,115200n8 noinitrd rw root=/dev/mmcblk0p2 mem=64M
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)

I told you to change the below u-boot bootargs,

setenv bootargs 'console=tty2,115200n8 noinitrd rw rootfstype=ext3 root=/dev/mmcblk0p2 rootwait mem=64M

That also not happened :(

Please change the above bootargs in u-boot shell.

If you dont know how to change it then please revert back.

^{Hi Titus :}

    Sorry!

    After run at:

setenv bootargs 'console=tty2,115200n8 noinitrd rw rootfstype=ext3 root=/dev/mmcblk0p2 rootwait mem=64M

   error exist yet.

 Stop at:

Waiting for root device /dev/mmcblk0p2...

 All log see at:

Uncompressing Linux... done, booting the kernel.
Linux version 2.6.33-rc4 (root@ubuntu) (gcc version 4.4.3 (ctng-1.6.1) ) #8 PREEMPT Mon Mar 17 09:59:50 HKT 2014
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/am18xx variant 0x1
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
Kernel command line: console=tty2,115200n8 noinitrd rw rootfstype=ext2 root=/dev/mmcblk0p2 rootwait mem=64M
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 60420KB available (3988K code, 312K 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
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
pca953x 1-0020: failed reading register
i2c-gpio i2c-gpio.1: using pins 20 (SDA) and 21 (SCL)
vpif vpif: vpif probe success
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: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
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 118
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
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: non-JEDEC variant of m25p64
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"
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.
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
adv7343 1-002a: chip found @ 0x54 (i2c-gpio1)
adv7343 1-002a: Error initializing
vpif_display vpif_display: Error registering v4l2 subdevice
vpif_display vpif_display: VPIF IRQ request failed
vpif_capture vpif_capture: Error registering v4l2 subdevice
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 i2c1
Clocks: disable unused emac
Clocks: disable unused aemif
Clocks: disable unused spi0
Clocks: disable unused mcbsp0
Clocks: disable unused mcbsp1
davinci_emac_probe: using random MAC addr: 0a:ae:c4:a5:cd:b7
emac-mii: probed
omap_rtc omap_rtc: setting system clock to 2000-01-01 00:00:00 UTC (946684800)
Waiting for root device /dev/mmcblk0p2...

Thanks very much!

Hi,

Thanks for your understanding,

Kernel command line: console=tty2,115200n8 noinitrd rw rootfstype=ext2 root=/dev/mmcblk0p2 rootwait mem=64M

From the attached logs,

Have you formatted your SD card's 2nd partition as a ext2 ?

yes. It is ext2.