The obvious question: what did I do wrong? I don't know, one day everything 
worked consistently, then this started out. I thought the SD was corrupted 
and reflashed it with a dd image I previously made, but the problem is 
still there. I tried with different boards, no way. It seems like a virus ;)

On Wednesday, June 25, 2014 6:06:11 PM UTC+2, Leonardo Gabrielli wrote:
>
> Dear group,
> before going into a thorough research I ask you if you ever experienced 
> this:
> 8 out of 10 reboots of the BBxM stop due to kernel oops at totally random 
> moments in the boot process.
> I have tested it on multiple BB and I get always Oops. At some times the 
> boot sequence can get to the login without oops, but rarely.
>
> Pasting here a few examples gathered from the console at boot (just the 
> beginning of the oops message):
>
> [    4.951324] udevd[85]: starting version 175
> [    5.144683] usb 2-2: new high-speed USB device number 2 using ehci-omap
> [    5.222869] Unable to handle kernel paging request at virtual address 
> 1edf8026
> [    5.230438] pgd = de3e4000
> [    5.233276] [1edf8026] *pgd=00000000   
> [    5.236999] Internal error: Oops: 805 [#1] SMP ARM
> [    5.242004] Modules linked in:
> [    5.245208] CPU: 0 PID: 118 Comm: udevd Not tainted 3.15.1-armv7-x2 #1
>
> etc...
>
> [    9.412963] omap-twl4030 sound.5: twl4030-hifi <-> 49022000.mcbsp 
> mapping ok
> done.
> [    9.878204] Unable to handle kernel NULL pointer dereference at virtual 
> address 00000004
> [    9.886810] pgd = df414000
> [    9.889617] [00000004] *pgd=9e06b831, *pte=00000000, *ppte=00000000
> [    9.896240] Internal error: Oops: 17 [#1] SMP ARM
> [    9.901153] Modules linked in: leds_pwm snd_soc_omap_twl4030 
> snd_soc_omap gpio_keys snd_soc_omap_mcbsp snd_soc_twl4030 snd_soc_core 
> snd_compress snd_pcm_dmaengine snd_pcm snd_seq omap_aes snd_seq_device 
> snd_timer snd smsc95xx usbnet evdev soundcore rtc_twl twl4030_keypad 
> matrix_keymap
>
> etc... 
>
> fsck from util-linux 2.20.1
> rootfs was not cleanly unmounted, check forced.
> rootfs: 55636/232464 files (0.1% non-contiguous), 335295/942848 blocks
> fsck died with exit status 1
> failed (code 1).
> [   13.743408] EXT4-fs (mmcblk0p2): re-mounted. Opts: errors=remount-ro
> [ ok ] Cleaning up temporary files... /tmp.
> [   14.735748] Unable to handle kernel paging request at virtual address 
> 1edf8026
> [   14.743316] pgd = db77c000
> [   14.746154] [1edf8026] *pgd=00000000
> [   14.749877] Internal error: Oops: 805 [#3] SMP ARM
> [   14.754882] Modules linked in:
>
> etc...
>
> [   11.426849] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
> [....] Checking root file system...fsck from util-linux 2.20.1
> rootfs was not cleanly unmounted, check forced.
> [   13.818634] Internal error: Oops - undefined instruction: 0 [#2] SMP ARM
> [   13.825653] Modules linked in: snd_soc_omap_twl4030 leds_pwm 
> snd_soc_omap gpio_keys snd_soc_omap_mcbsp omap_aes snd_soc_twl4030 
> snd_soc_core snd_compress snd_pcm_dmaengine snd_pcm snd_seq snd_seq_device 
> snd_timer snd rtc_twl smsc95xx usbnet evdev soundcore twl4030_keypad 
> matrix_keymap
> [   13.852111] CPU: 0 PID: 3 Comm: ksoftirqd/0 Tainted: G      D       
> 3.15.1-armv7-x2 #1
>
>
> Just FYI, the first serial print:
>
> U-Boot 2014.01-00014-gcc58fc1 (Feb 10 2014 - 16:24:52)
>
> OMAP3630/3730-GP ES1.2, CPU-OPP2, L3-200MHz, Max CPU Clock 1 Ghz
> OMAP3 Beagle board + LPDDR/NAND
> I2C:   ready
> DRAM:  512 MiB
> NAND:  0 MiB
> MMC:   OMAP SD/MMC: 0
> *** Warning - readenv() failed, using default environment
>
> In:    serial
> Out:   serial
> Err:   serial
> Beagle xM Rev C
> No EEPROM on expansion board
> No EEPROM on expansion board
> Die ID #60b000029ff800000160a7450701e011
> Net:   usb_ether
> Hit any key to stop autoboot:  0 
> mmc0 is current device
> gpio: pin 173 (gpio 173) value is 0
> gpio: pin 4 (gpio 4) value is 0
> SD/MMC found on device 0
> reading uEnv.txt
> 807 bytes read in 3 ms (262.7 KiB/s)
> Loaded environment from uEnv.txt
> Importing environment from mmc ...
> Checking if lcdcmd is set ...
> Checking if uenvcmd is set ...
> Running uenvcmd ...
> reading zImage
> 4737144 bytes read in 292 ms (15.5 MiB/s)
> reading initrd.img
> 3019480 bytes read in 188 ms (15.3 MiB/s)
> reading /dtbs/omap3-beagle-xm.dtb
> 61643 bytes read in 13 ms (4.5 MiB/s)
> ## Error: "expansion_args" not defined
> Kernel image @ 0x80300000 [ 0x000000 - 0x484878 ]
> ## Flattened Device Tree blob at 815f0000
>    Booting using the fdt blob at 0x815f0000
>    Using Device Tree in place at 815f0000, end 816020ca
>
> Starting kernel ...
>

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