I'd recommend to get a Linux-distro that runs from microSD card too (like 
Ubuntu), boot it with Boot-switch pressed and then check the eMMC 
manually/copy the distro to it.



Am Dienstag, 22. September 2015 15:57:36 UTC+2 schrieb Iñigo Martínez:
>
>
> I have somewhat bricked the BeagleBone Black. When I boot it, when 
> connected using the serial port, it does write the 'C' character 
> continuously. Looking through the board I have seen the a post (
> https://groups.google.com/forum/#!topic/beagleboard/pDr_rLDYqy4) where it 
> has a similar problem. I have tried reflashing the eMMC using several 
> images but no luck at the moment.
>
> Using the flasher images, this is the output using the serial port:
>
> U-Boot 2013.04-dirty (Jun 19 2013 - 09:57:14)
>
> I2C:   ready
> DRAM:  512 MiB
> WARNING: Caches not enabled
> NAND:  No NAND device found!!!
> 0 MiB
> MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
> *** Warning - readenv() failed, using default environment
>
> musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, HB-ISO Rx, HB-ISO Tx, 
> SoftConn)
> musb-hdrc: MHDRC RTL version 2.0 
> musb-hdrc: setup fifo_mode 4
> musb-hdrc: 28/31 max ep, 16384/16384 memory
> USB Peripheral mode controller at 47401000 using PIO, IRQ 0
> musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, HB-ISO Rx, HB-ISO Tx, 
> SoftConn)
> musb-hdrc: MHDRC RTL version 2.0 
> musb-hdrc: setup fifo_mode 4
> musb-hdrc: 28/31 max ep, 16384/16384 memory
> USB Host mode controller at 47401800 using PIO, IRQ 0
> Net:   <ethaddr> not set. Validating first E-fuse MAC
> Phy not found
> PHY reset timed out
> cpsw, usb_ether
> Hit any key to stop autoboot:  0 
> gpio: pin 53 (gpio 53) value is 1
> mmc0 is current device
> micro SD card found
> mmc0 is current device
> gpio: pin 54 (gpio 54) value is 1
> SD/MMC found on device 0
> reading uEnv.txt
> 14 bytes read in 2 ms (6.8 KiB/s)
> Loaded environment from uEnv.txt
> Importing environment from mmc ...
> gpio: pin 55 (gpio 55) value is 1
> 4270840 bytes read in 742 ms (5.5 MiB/s)
> gpio: pin 56 (gpio 56) value is 1
> 24125 bytes read in 37 ms (636.7 KiB/s)
> Booting from mmc ...
> ## Booting kernel from Legacy Image at 80007fc0 ...
>    Image Name:   Angstrom/3.8.13/beaglebone
>    Image Type:   ARM Linux Kernel Image (uncompressed)
>    Data Size:    4270776 Bytes = 4.1 MiB
>    Load Address: 80008000
>    Entry Point:  80008000
>    Verifying Checksum ... OK
> ## Flattened Device Tree blob at 80f80000
>    Booting using the fdt blob at 0x80f80000
>    XIP Kernel Image ... OK
> OK
>    Using Device Tree in place at 80f80000, end 80f88e3c
>
> Starting kernel ...
>
> Uncompressing Linux... done, booting the kernel.
> [    0.194258] omap2_mbox_probe: platform not supported
> [    0.204902] tps65217-bl tps65217-bl: no platform data provided
> [    0.281411] bone-capemgr bone_capemgr.9: slot #0: No cape found
> [    0.318516] bone-capemgr bone_capemgr.9: slot #1: No cape found
> [    0.355625] bone-capemgr bone_capemgr.9: slot #2: No cape found
> [    0.392734] bone-capemgr bone_capemgr.9: slot #3: No cape found
> [    0.412204] bone-capemgr bone_capemgr.9: slot #6: BB-BONELT-HDMIN 
> conflict P8.45 (#5:BB-BONELT-HDMI)
> [    0.421850] bone-capemgr bone_capemgr.9: slot #6: Failed verification
> [    0.428623] bone-capemgr bone_capemgr.9: loader: failed to load slot-6 
> BB-BONELT-HDMIN:00A0 (prio 2)
> [    0.451158] omap_hsmmc mmc.4: of_parse_phandle_with_args of 'reset' 
> failed
> [    0.516302] pinctrl-single 44e10800.pinmux: pin 44e10854 already 
> requested by 44e10800.pinmux; cannot claim for gpio-leds.8
> [    0.528015] pinctrl-single 44e10800.pinmux: pin-21 (gpio-leds.8) status 
> -22
> [    0.535329] pinctrl-single 44e10800.pinmux: could not request pin 21 on 
> device pinctrl-single
> [    0.756933] Unhandled fault: external abort on non-linefetch (0x1008) 
> at 0xe09fe000
> [    0.764946] Internal error: : 1008 [#1] SMP THUMB2
> [    0.769950] Modules linked in:
> [    0.773154] CPU: 0    Not tainted  (3.8.13 #1)
> [    0.777817] PC is at cpsw_probe+0x3fc/0x8a2
> [    0.782197] LR is at ioremap_page_range+0xc3/0x100
> [    0.787208] pc : [<c023f752>]    lr : [<c019399b>]    psr: 80000133
> [    0.787208] sp : df051e18  ip : df04d7f8  fp : 00000001
> [    0.799198] r10: df3dace0  r9 : df3d9590  r8 : 00000000
> [    0.804658] r7 : e09fe000  r6 : df10d600  r5 : df10d610  r4 : df3d9000
> [    0.811477] r3 : 00000000  r2 : 00000800  r1 : c023f73d  r0 : e09fe000
> [    0.818299] Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA Thumb  
> Segment kernel
> [    0.826116] Control: 50c5387d  Table: 80004019  DAC: 00000015
> [    0.832119] Process swapper/0 (pid: 1, stack limit = 0xdf050240)
> [    0.838394] Stack: (0xdf051e18 to 0xdf052000)
> [    0.842949] 1e00:                                                       
> 00000000 df2a88c0
> [    0.851500] 1e20: c0659c40 df2a88c0 df3d9298 c036f873 df04cac0 00000000 
> df051e4c 00000020
> [    0.860052] 1e40: 00000008 c00ce4c1 df051e90 df5fc248 df051e78 df04cac0 
> df5fc2c8 df5fc248
> [    0.868603] 1e60: df5fc248 c00ce403 00000000 df5fc248 df10c148 df3d00c0 
> 00000000 c00cebdf
> [    0.877155] 1e80: df0464b8 c0040449 00000000 00000003 df10c148 00000000 
> c0672990 df10d610
> [    0.885706] 1ea0: df10d644 c0672990 c01f234d 000000e8 c05edf81 00000000 
> 00000000 c01f2cb9
> [    0.894259] 1ec0: c01f2cad c01f226f 00000000 df10d610 df10d644 c0672990 
> c01f234d c01f2381
> [    0.902810] 1ee0: 00000000 df051ef0 c0672990 c01f139d df046478 df109880 
> c0672990 c0672990
> [    0.911361] 1f00: df3d00c0 c06691f8 00000000 c01f1d33 c04ff0a7 df001348 
> c0672990 c05f62f0
> [    0.919912] 1f20: c061458c c0689cc0 000000e8 c01f2661 00000007 c05f62f0 
> c061458c c0689cc0
> [    0.928463] 1f40: 000000e8 c000868d c05edf81 13000000 c06145b8 00000008 
> 00000007 c05f62f0
> [    0.937013] 1f60: c061458c c0689cc0 000000e8 c05f62f8 c05d61d5 c05d6691 
> 00000007 00000007
> [    0.945563] 1f80: c05d61d5 00000000 00000000 c0369129 00000000 00000000 
> 00000000 00000000
> [    0.954113] 1fa0: 00000000 c036912f 00000000 c000c6fd 00000000 00000000 
> 00000000 00000000
> [    0.962663] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 
> 00000000 00000000
> [    0.971212] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 
> 7fdf55ff 7df57ddd
> [    0.979791] [<c023f752>] (cpsw_probe+0x3fc/0x8a2) from [<c01f2cb9>] 
> (platform_drv_probe+0xd/0xe)
> [    0.988986] [<c01f2cb9>] (platform_drv_probe+0xd/0xe) from [<c01f226f>] 
> (driver_probe_device+0x67/0x144)
> [    0.998903] [<c01f226f>] (driver_probe_device+0x67/0x144) from 
> [<c01f2381>] (__driver_attach+0x35/0x48)
> [    1.008729] [<c01f2381>] (__driver_attach+0x35/0x48) from [<c01f139d>] 
> (bus_for_each_dev+0x29/0x48)
> [    1.018191] [<c01f139d>] (bus_for_each_dev+0x29/0x48) from [<c01f1d33>] 
> (bus_add_driver+0x83/0x158)
> [    1.027652] [<c01f1d33>] (bus_add_driver+0x83/0x158) from [<c01f2661>] 
> (driver_register+0x4d/0xa4)
> [    1.037024] [<c01f2661>] (driver_register+0x4d/0xa4) from [<c000868d>] 
> (do_one_initcall+0x61/0xec)
> [    1.046405] [<c000868d>] (do_one_initcall+0x61/0xec) from [<c05d6691>] 
> (kernel_init_freeable+0xb9/0x14c)
> [    1.056327] [<c05d6691>] (kernel_init_freeable+0xb9/0x14c) from 
> [<c036912f>] (kernel_init+0x7/0x90)
> [    1.065796] [<c036912f>] (kernel_init+0x7/0x90) from [<c000c6fd>] 
> (ret_from_fork+0x11/0x34)
> [    1.074529] Code: ff6c e200 f8c4 05c0 (6803) f44f 
> [    1.079539] ---[ end trace 4f887ca3f0928b01 ]---
> [    1.084817] Kernel panic - not syncing: Attempted to kill init! 
> exitcode=0x0000000b
> [    1.084817] 
> [    1.094373] drm_kms_helper: panic occurred, switching back to text 
> console
>
> Looks like the flasher in the uSD isn't able even to boot. Is there any 
> way to solve this problem ?
>
> Thank you,
>
> Best regards,
>

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