U-Boot SPL 2011.09 (Feb 09 2012 - 15:38:59)Texas Instruments Revision detection unimplementedNo AC power, disabling frequency switchOMAP SD/MMC: 0reading u-boot.imgreading u-boot.img
U-Boot 2011.09 (Feb 09 2012 - 15:11:31)
I2C: readyDRAM: 256 MiBWARNING: Caches not enabledNo daughter card presentNAND: HW ECC Hamming Code selectednand_get_flash_type: unknown NAND device: Manufacturer ID: 0x10, Chip ID: 0x10No NAND device found!!!0 MiBMMC: OMAP SD/MMC: 0*** Warning - readenv() failed, using default environment
Net: cpswHit any key to stop autoboot: 3 2 1 0 SD/MMC found on device 0reading uEnv.txt
** Unable to read "uEnv.txt" from mmc 0:1 **reading uImage
2922160 bytes read## Booting kernel from Legacy Image at 80007fc0 ... Image Name: Arago/3.1.0-psp04.06.00.03.sdk/a Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 2922096 Bytes = 2.8 MiB Load Address: 80008000 Entry Point: 80008000 Verifying Checksum ... OK XIP Kernel Image ... OKOK
Starting kernel ...
Uncompressing Linux... done, booting the kernel.[ 0.000000] Linux version 3.1.0 (jenkins@sdit-build01) (gcc version 4.5.3 20110311 (prerelease) (GCC) ) #1 Thu Feb 9 14:58:49 CST 2012[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7f[ 0.000000] CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache[ 0.000000] Machine: am335xevm[ 0.000000] Memory policy: ECC disabled, Data cache writeback[ 0.000000] AM335X ES1.0 (neon )[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 65024[ 0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait ip=none[ 0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)[ 0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)[ 0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)[ 0.000000] Memory: 256MB = 256MB total[ 0.000000] Memory: 253724k/253724k available, 8420k reserved, 0K highmem[ 0.000000] Virtual kernel memory layout:[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)[ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)[ 0.000000] DMA : 0xffa00000 - 0xffe00000 ( 4 MB)[ 0.000000] vmalloc : 0xd0800000 - 0xf8000000 ( 632 MB)[ 0.000000] lowmem : 0xc0000000 - 0xd0000000 ( 256 MB)[ 0.000000] modules : 0xbf000000 - 0xc0000000 ( 16 MB)[ 0.000000] .text : 0xc0008000 - 0xc0534000 (5296 kB)[ 0.000000] .init : 0xc0534000 - 0xc056d000 ( 228 kB)[ 0.000000] .data : 0xc056e000 - 0xc05c2d80 ( 340 kB)[ 0.000000] .bss : 0xc05c2da4 - 0xc05fd320 ( 234 kB)[ 0.000000] NR_IRQS:396[ 0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts[ 0.000000] Total of 128 interrupts on 1 active controller[ 0.000000] OMAP clockevent source: GPTIMER1 at 24000000 Hz[ 0.000000] OMAP clocksource: GPTIMER2 at 24000000 Hz[ 0.000000] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms[ 0.000000] Console: colour dummy device 80x30[ 0.000253] Calibrating delay loop... 498.89 BogoMIPS (lpj=2494464)[ 0.058628] pid_max: default: 32768 minimum: 301[ 0.058790] Security Framework initialized[ 0.058912] Mount-cache hash table entries: 512[ 0.059362] CPU: Testing write buffer coherency: ok[ 0.064934] print_constraints: dummy: [ 0.065406] NET: Registered protocol family 16[ 0.065830] GPMC revision 6.0[ 0.068424] OMAP GPIO hardware version 0.1[ 0.071354] omap_l3_smx omap_l3_smx.0: couldn't find resource[ 0.071988] omap_mux_init: Add partition: #1: core, flags: 0[ 0.075901] omap_i2c.1: alias fck already exists[ 0.077889] omap2_mcspi.1: alias fck already exists[ 0.078180] omap2_mcspi.2: alias fck already exists[ 0.108109] bio: create slab <bio-0> at 0[ 0.110992] SCSI subsystem initialized[ 0.113083] usbcore: registered new interface driver usbfs[ 0.113511] usbcore: registered new interface driver hub[ 0.113780] usbcore: registered new device driver usb[ 0.128789] omap_i2c omap_i2c.1: bus 1 rev4.0 at 100 kHz[ 0.131449] Advanced Linux Sound Architecture Driver Version 1.0.24.[ 0.132812] Switching to clocksource gp timer[ 0.138705] Switched to NOHz mode on CPU #0[ 0.153902] musb-hdrc: version 6.0, ?dma?, otg (peripheral+host)[ 0.154133] musb-hdrc musb-hdrc.0: dma type: pio[ 0.155200] musb-hdrc musb-hdrc.0: USB OTG mode controller at d080a000 using PIO, IRQ 18[ 0.155411] musb-hdrc musb-hdrc.1: dma type: pio[ 0.156324] musb-hdrc musb-hdrc.1: USB OTG mode controller at d080c800 using PIO, IRQ 19[ 0.156814] NET: Registered protocol family 2[ 0.157052] IP route cache hash table entries: 2048 (order: 1, 8192 bytes)[ 0.157416] TCP established hash table entries: 8192 (order: 4, 65536 bytes)[ 0.157640] TCP bind hash table entries: 8192 (order: 3, 32768 bytes)[ 0.157776] TCP: Hash tables configured (established 8192 bind 8192)[ 0.157792] TCP reno registered[ 0.157810] UDP hash table entries: 256 (order: 0, 4096 bytes)[ 0.157842] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)[ 0.158085] NET: Registered protocol family 1[ 0.158446] RPC: Registered named UNIX socket transport module.[ 0.158466] RPC: Registered udp transport module.[ 0.158479] RPC: Registered tcp transport module.[ 0.158491] RPC: Registered tcp NFSv4.1 backchannel transport module.[ 0.158769] NetWinder Floating Point Emulator V0.97 (double precision)[ 0.172819] VFS: Disk quotas dquot_6.5.2[ 0.172966] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)[ 0.173747] JFFS2 version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.[ 0.174149] msgmni has been set to 495[ 0.175124] io scheduler noop registered[ 0.175144] io scheduler deadline registered[ 0.175243] io scheduler cfq registered (default)[ 0.176355] Could not set LED4 to fully on[ 0.178408] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled[ 0.180581] omap_uart.0: ttyO0 at MMIO 0x44e09000 (irq = 72) is a OMAP UART0[ 0.659987] console [ttyO0] enabled[ 0.664378] omap_uart.1: ttyO1 at MMIO 0x48022000 (irq = 73) is a OMAP UART1[ 0.672236] omap_uart.2: ttyO2 at MMIO 0x48024000 (irq = 74) is a OMAP UART2[ 0.680168] omap_uart.3: ttyO3 at MMIO 0x481a6000 (irq = 44) is a OMAP UART3[ 0.688038] omap_uart.4: ttyO4 at MMIO 0x481a8000 (irq = 45) is a OMAP UART4[ 0.695901] omap_uart.5: ttyO5 at MMIO 0x481aa000 (irq = 46) is a OMAP UART5[ 0.715591] brd: module loaded[ 0.725333] loop: module loaded[ 0.728865] i2c-core: driver [tsl2550] using legacy suspend method[ 0.735418] i2c-core: driver [tsl2550] using legacy resume method[ 0.741906] at24 1-0051: 32768 byte 24c256 EEPROM, writable, 64 bytes/write[ 0.802863] No daughter card found[ 0.806495] at24 1-0050: 32768 byte 24c256 EEPROM, writable, 64 bytes/write[ 0.821796] Board name: A335BONE[ 0.825208] Board version: 00A5[ 0.828508] The board is a AM335x Beaglebone.[ 0.833525] omap_hsmmc.0: alias fck already exists[ 0.841749] mtdoops: mtd device (mtddev=name/number) must be supplied[ 0.848931] omap2-nand driver initializing[ 0.853581] OneNAND driver initializing[ 0.902879] davinci_mdio davinci_mdio.0: davinci mdio revision 1.6[ 0.909389] davinci_mdio davinci_mdio.0: detected phy mask fffffffe[ 0.916784] davinci_mdio.0: probed[ 0.920369] davinci_mdio davinci_mdio.0: phy[0]: device 0:00, driver SMSC LAN8710/LAN8720[ 0.929199] CAN device driver interface[ 0.933257] CAN bus driver for Bosch D_CAN controller 1.0[ 0.939832] usbcore: registered new interface driver cdc_ether[ 0.946234] usbcore: registered new interface driver cdc_subset[ 0.952513] Initializing USB Mass Storage driver...[ 0.957911] usbcore: registered new interface driver usb-storage[ 0.964253] USB Mass Storage support registered.[ 0.969168] musb-hdrc musb-hdrc.1: MUSB HDRC host driver[ 0.974856] musb-hdrc musb-hdrc.1: new USB bus registered, assigned bus number 1[ 0.982764] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002[ 0.989936] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1[ 0.997547] usb usb1: Product: MUSB HDRC host driver[ 1.002766] usb usb1: Manufacturer: Linux 3.1.0 musb-hcd[ 1.008371] usb usb1: SerialNumber: musb-hdrc.1[ 1.014154] hub 1-0:1.0: USB hub found[ 1.018133] hub 1-0:1.0: 1 port detected[ 1.023665] mousedev: PS/2 mouse device common for all mice[ 1.030917] omap_rtc omap_rtc: rtc core: registered omap_rtc as rtc0[ 1.037693] omap_rtc: already running[ 1.041843] i2c /dev entries driver[ 1.048636] OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec[ 1.055641] cpuidle: using governor ladder[ 1.060588] cpuidle: using governor menu[ 1.069282] usbcore: registered new interface driver usbhid[ 1.075227] usbhid: USB HID core driver[ 1.080254] usbcore: registered new interface driver snd-usb-audio[ 1.089170] ALSA device list:[ 1.092295] No soundcards found.[ 1.095923] oprofile: hardware counters not available[ 1.101232] oprofile: using timer interrupt.[ 1.105771] nf_conntrack version 0.5.0 (3964 buckets, 15856 max)[ 1.112705] ip_tables: (C) 2000-2006 Netfilter Core Team[ 1.118486] TCP cubic registered[ 1.121887] NET: Registered protocol family 17[ 1.126596] can: controller area network core (rev 20090105 abi 8)[ 1.133221] NET: Registered protocol family 29[ 1.137896] can: raw protocol (rev 20090105)[ 1.142384] can: broadcast manager protocol (rev 20090105 t)[ 1.148410] Registering the dns_resolver key type[ 1.153467] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3[ 1.161535] ThumbEE CPU extension supported.[ 1.166960] _regulator_get: mpu.0 supply mpu not found, using dummy regulator[ 1.174621] omap2_set_init_voltage: Fail set voltage-dpll_mpu_ck(f=500000000 v=1100000)on vddmpu[ 1.183885] omap2_set_init_voltage: unable to set vdd_mpu[ 1.195186] Detected MACID=d4:94:a1:87:66:48[ 1.201600] omap_rtc omap_rtc: setting system clock to 2000-01-01 00:03:30 UTC (946685010)[ 1.211060] Waiting for root device /dev/mmcblk0p2...[ 1.245003] mmc0: host does not support reading read-only switch. assuming write-enable.[ 1.256216] mmc0: new high speed SD card at address 1234[ 1.262652] mmcblk0: mmc0:1234 SA02G 1.83 GiB [ 1.271453] mmcblk0:[ 1.323118] VFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2)[ 1.330533] Please append a correct "root=" boot option; here are the available partitions:[ 1.339372] b300 1927168 mmcblk0 driver: mmcblk[ 1.344983] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)[ 1.353873] Backtrace: [ 1.356493] [<c0017990>] (dump_backtrace+0x0/0x110) from [<c03e6c7c>] (dump_stack+0x18/0x1c)[ 1.365382] r6:cf937000 r5:c055e9a4 r4:c05c3da0 r3:c058e250[ 1.371366] [<c03e6c64>] (dump_stack+0x0/0x1c) from [<c03e6cec>] (panic+0x6c/0x1a0)[ 1.379463] [<c03e6c80>] (panic+0x0/0x1a0) from [<c0534cb4>] (mount_block_root+0x184/0x228)[ 1.388260] r3:c058e250 r2:00000000 r1:cf81bf58 r0:c04adf70[ 1.394242] r7:00008000[ 1.396918] [<c0534b30>] (mount_block_root+0x0/0x228) from [<c0534f1c>] (mount_root+0xd8/0xe0)[ 1.405996] [<c0534e44>] (mount_root+0x0/0xe0) from [<c05350c4>] (prepare_namespace+0x1a0/0x1dc)[ 1.415246] r4:c05c2e20[ 1.417920] [<c0534f24>] (prepare_namespace+0x0/0x1dc) from [<c053490c>] (kernel_init+0x124/0x130)[ 1.427352] r5:c056ca28 r4:c056ca28[ 1.431142] [<c05347e8>] (kernel_init+0x0/0x130) from [<c004076c>] (do_exit+0x0/0x6a0)[ 1.439478] r5:c05347e8 r4:00000000
then stopped，This is why？
Can you try with the latest 05.04.00.00 SDK release? You can find it at http://software-dl.ti.com/dsps/dsps_public_sw/am_bu/sdk/AM335xSDK/latest/index_FDS.html
Chase
I also have tried with the latest 05.04.00.00 SDK release ，and the phenomenon is same。One of my friends who is using beaglebone is also the same problem。
It looks like your SD Card is not created properly. How did you create the card? The TI Wiki has some instructions here:
http://processors.wiki.ti.com/index.php/AM335x_U-Boot_User%27s_Guide#Setting_Up_Boot_Environment_on_SD_Card
You might want to try a 1GB or 4GB card. The 2GB size can cause problems if your card reader is one of the older models. That size needs a MBR.
The problem is solved。The fourth floor is the right。