Quite often my BBB gets stuck during bootup. Allways at "i2c i2c-2: SCL is 
stuck low, exit recovery"

When I reset a couple of times it boots up okay. 

My BBB runs from an SD card with Debian 4.1.17-ti-rt-r46.

U-Boot SPL 2015.07-rc3-00001-g2c9c20a (Jun 30 2015 - 09:02:07)
>
>
>>
>> U-Boot 2015.07-rc3-00001-g2c9c20a (Jun 30 2015 - 09:02:07 -0500), Build: 
>> jenkins-github_Bootloader-Builder-173
>
>
>>        Watchdog enabled
>
> I2C:   ready
>
> DRAM:  512 MiB
>
> MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
>
> Using default environment
>
>
>> Net:   <ethaddr> not set. Validating first E-fuse MAC
>
> Phy 0 not found
>
> cpsw
>
> Hit any key to stop autoboot:  0 
>
> gpio: pin 53 (gpio 53) value is 1
>
> switch to partitions #0, OK
>
> mmc0 is current device
>
> gpio: pin 54 (gpio 54) value is 1
>
> Checking for: /uEnv.txt ...
>
> Checking for: /boot.scr ...
>
> Checking for: /boot/boot.scr ...
>
> Checking for: /boot/uEnv.txt ...
>
> gpio: pin 55 (gpio 55) value is 1
>
> 281 bytes read in 24 ms (10.7 KiB/s)
>
> Loaded environment from /boot/uEnv.txt
>
> Using: dtb=am335x-boneblack-overlay.dtb ...
>
> Checking if uname_r is set in /boot/uEnv.txt...
>
> gpio: pin 56 (gpio 56) value is 1
>
> Running uname_boot ...
>
> loading /boot/vmlinuz-4.1.17-ti-rt-r46 ...
>
> 7777608 bytes read in 461 ms (16.1 MiB/s)
>
> loading /boot/dtbs/4.1.17-ti-rt-r46/am335x-boneblack-overlay.dtb ...
>
> 57971 bytes read in 52 ms (1.1 MiB/s)
>
> loading /boot/initrd.img-4.1.17-ti-rt-r46 ...
>
> 5125199 bytes read in 313 ms (15.6 MiB/s)
>
> debug: [console=ttyO0,115200n8 bone_capemgr.disable_partno= 
>> bone_capemgr.enable_partno=cape-univ-audio,cape-univ-emmc,cape-univ-hdmi 
>> root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait fixrtc] ...
>
> debug: [bootz 0x82000000 0x88080000:4e344f 0x88000000] ...
>
> Kernel image @ 0x82000000 [ 0x000000 - 0x76ad48 ]
>
> ## Flattened Device Tree blob at 88000000
>
>    Booting using the fdt blob at 0x88000000
>
>    Loading Ramdisk to 8fb1c000, end 8ffff44f ... OK
>
>    Loading Device Tree to 8fb0a000, end 8fb1b272 ... OK
>
>
>> Starting kernel ...
>
>
>> [    0.000000] Booting Linux on physical CPU 0x0
>
> [    0.000000] Initializing cgroup subsys cpuset
>
> [    0.000000] Initializing cgroup subsys cpu
>
> [    0.000000] Initializing cgroup subsys cpuacct
>
> [    0.000000] Linux version 4.1.17-ti-rt-r46 (peer23peer@peerLaptop) (gcc 
>> version 4.9.3 20150413 (prerelease) (Linaro GCC 4.9-2015.05) ) #1 SMP 
>> PREEMPT RT Sun Feb 7 17:10:04 CET 2016
>
> [    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), 
>> cr=50c5387d
>
> [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing 
>> instruction cache
>
> [    0.000000] Machine model: TI AM335x BeagleBone Black
>
> [    0.000000] cma: Reserved 24 MiB at 0x9e000000
>
> [    0.000000] Memory policy: Data cache writeback
>
> [    0.000000] CPU: All CPU(s) started in SVC mode.
>
> [    0.000000] AM335X ES2.1 (sgx neon )
>
> [    0.000000] PERCPU: Embedded 13 pages/cpu @df910000 s24128 r8192 d20928 
>> u53248
>
> [    0.000000] Built 1 zonelists in Zone order, mobility grouping on. 
>>  Total pages: 129408
>
> [    0.000000] Kernel command line: console=ttyO0,115200n8 
>> bone_capemgr.disable_partno= 
>> bone_capemgr.enable_partno=cape-univ-audio,cape-univ-emmc,cape-univ-hdmi 
>> root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait fixrtc
>
> [    0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
>
> [    0.000000] Dentry cache hash table entries: 65536 (order: 7, 524288 
>> bytes)
>
> [    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 
>> bytes)
>
> [    0.000000] Memory: 473484K/522240K available (7169K kernel code, 935K 
>> rwdata, 3764K rodata, 560K init, 954K bss, 24180K reserved, 24576K 
>> cma-reserved, 0K highmem)
>
> [    0.000000] Virtual kernel memory layout:
>
> [    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
>
> [    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
>
> [    0.000000]     vmalloc : 0xe0800000 - 0xff000000   ( 488 MB)
>
> [    0.000000]     lowmem  : 0xc0000000 - 0xe0000000   ( 512 MB)
>
> [    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
>
> [    0.000000]     modules : 0xbf800000 - 0xbfe00000   (   6 MB)
>
> [    0.000000]       .text : 0xc0008000 - 0xc0ab58c8   (10935 kB)
>
> [    0.000000]       .init : 0xc0ab6000 - 0xc0b42000   ( 560 kB)
>
> [    0.000000]       .data : 0xc0b42000 - 0xc0c2beac   ( 936 kB)
>
> [    0.000000]        .bss : 0xc0c2e000 - 0xc0d1caa0   ( 955 kB)
>
> [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
>
> [    0.000000] Preemptible hierarchical RCU implementation.
>
> [    0.000000] RCU restricting CPUs from NR_CPUS=2 to nr_cpu_ids=1.
>
> [    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
>
> [    0.000000] NR_IRQS:16 nr_irqs:16 16
>
> [    0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 
>> interrupts
>
> [    0.000000] OMAP clockevent source: timer2 at 24000000 Hz
>
> [    0.000012] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 
>> 89478484971ns
>
> [    0.000025] clocksource timer1: mask: 0xffffffff max_cycles: 
>> 0xffffffff, max_idle_ns: 79635851949 ns
>
> [    0.000032] OMAP clocksource: timer1 at 24000000 Hz
>
> [    0.000226] Console: colour dummy device 80x30
>
> [    0.000391] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
>
> [    0.000394] This ensures that you still see kernel messages. Please
>
> [    0.000397] update your kernel commandline.
>
> [    0.088890] Calibrating delay loop... 996.14 BogoMIPS (lpj=4980736)
>
> [    0.088897] pid_max: default: 32768 minimum: 301
>
> [    0.089041] Security Framework initialized
>
> [    0.089109] AppArmor: AppArmor disabled by boot time parameter
>
> [    0.089112] Yama: becoming mindful.
>
> [    0.089302] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
>
> [    0.089310] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 
>> bytes)
>
> [    0.090223] Initializing cgroup subsys blkio
>
> [    0.090238] Initializing cgroup subsys memory
>
> [    0.090280] Initializing cgroup subsys devices
>
> [    0.090294] Initializing cgroup subsys freezer
>
> [    0.090308] Initializing cgroup subsys net_cls
>
> [    0.090320] Initializing cgroup subsys perf_event
>
> [    0.090331] Initializing cgroup subsys net_prio
>
> [    0.090445] CPU: Testing write buffer coherency: ok
>
> [    0.090453] ftrace: allocating 35031 entries in 69 pages
>
> [    0.174578] CPU0: thread -1, cpu 0, socket -1, mpidr 0
>
> [    0.174751] Setting up static identity map for 0x80008240 - 0x8000828c
>
> [    0.268918] Brought up 1 CPUs
>
> [    0.268944] SMP: Total of 1 processors activated (996.14 BogoMIPS).
>
> [    0.268955] CPU: All CPU(s) started in SVC mode.
>
> [    0.269892] devtmpfs: initialized
>
> [    0.292310] VFP support v0.3: implementor 41 architecture 3 part 30 
>> variant c rev 3
>
> [    0.318329] omap_hwmod: debugss: _wait_target_disable failed
>
> [    0.373438] clocksource jiffies: mask: 0xffffffff max_cycles: 
>> 0xffffffff, max_idle_ns: 19112604462750000 ns
>
> [    0.375671] xor: measuring software checksum speed
>
> [    0.468949]    arm4regs  :  1222.400 MB/sec
>
> [    0.568881]    8regs     :   932.000 MB/sec
>
> [    0.668876]    32regs    :  1093.600 MB/sec
>
> [    0.768871]    neon      :  1682.800 MB/sec
>
> [    0.768881] xor: using function: neon (1682.800 MB/sec)
>
> [    0.769074] pinctrl core: initialized pinctrl subsystem
>
> [    0.771302] NET: Registered protocol family 16
>
> [    0.776046] DMA: preallocated 256 KiB pool for atomic coherent 
>> allocations
>
> [    0.808918] cpuidle: using governor ladder
>
> [    0.838909] cpuidle: using governor menu
>
> [    0.845771] OMAP GPIO hardware version 0.1
>
> [    0.846555] GPIO line 52 (EMMC ResetN) hogged as output/high
>
> [    0.861382] No ATAGs?
>
> [    0.861417] hw-breakpoint: debug architecture 0x4 unsupported.
>
> [    0.861997] omap4_sram_init:Unable to allocate sram needed to handle 
>> errata I688
>
> [    0.862014] omap4_sram_init:Unable to get sram pool needed to handle 
>> errata I688
>
> [    1.078995] raid6: int32x1  gen()   242 MB/s
>
> [    1.248919] raid6: int32x1  xor()   237 MB/s
>
> [    1.418891] raid6: int32x2  gen()   365 MB/s
>
> [    1.588905] raid6: int32x2  xor()   270 MB/s
>
> [    1.758907] raid6: int32x4  gen()   398 MB/s
>
> [    1.928997] raid6: int32x4  xor()   243 MB/s
>
> [    2.098890] raid6: int32x8  gen()   325 MB/s
>
> [    2.268948] raid6: int32x8  xor()   212 MB/s
>
> [    2.438890] raid6: neonx1   gen()  1457 MB/s
>
> [    2.608874] raid6: neonx2   gen()  1869 MB/s
>
> [    2.778883] raid6: neonx4   gen()  2014 MB/s
>
> [    2.948903] raid6: neonx8   gen()   894 MB/s
>
> [    2.948913] raid6: using algorithm neonx4 gen() 2014 MB/s
>
> [    2.948923] raid6: using intx1 recovery algorithm
>
> [    2.962295] edma 49000000.edma: TI EDMA DMA engine driver
>
> [    2.966212] vgaarb: loaded
>
> [    2.967072] SCSI subsystem initialized
>
> [    2.967900] usbcore: registered new interface driver usbfs
>
> [    2.967995] usbcore: registered new interface driver hub
>
> [    2.968162] usbcore: registered new device driver usb
>
> [    2.969039] omap_i2c 44e0b000.i2c: could not find pctldev for node 
>> /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c0_pins, deferring 
>> probe
>
> [    2.969103] omap_i2c 4819c000.i2c: could not find pctldev for node 
>> /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c2_pins, deferring 
>> probe
>
> [    2.969282] pps_core: LinuxPPS API ver. 1 registered
>
> [    2.969293] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo 
>> Giometti <[email protected]>
>
> [    2.969330] PTP clock support registered
>
> [    2.970541] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
>
> [    2.971222] Advanced Linux Sound Architecture Driver Initialized.
>
> [    2.972191] NetLabel: Initializing
>
> [    2.972205] NetLabel:  domain hash size = 128
>
> [    2.972213] NetLabel:  protocols = UNLABELED CIPSOv4
>
> [    2.972281] NetLabel:  unlabeled traffic allowed by default
>
> [    2.972633] Switched to clocksource timer1
>
> [    3.141730] NET: Registered protocol family 2
>
> [    3.142897] TCP established hash table entries: 4096 (order: 2, 16384 
>> bytes)
>
> [    3.142980] TCP bind hash table entries: 4096 (order: 4, 114688 bytes)
>
> [    3.143125] TCP: Hash tables configured (established 4096 bind 4096)
>
> [    3.143212] UDP hash table entries: 256 (order: 2, 16384 bytes)
>
> [    3.143249] UDP-Lite hash table entries: 256 (order: 2, 16384 bytes)
>
> [    3.143538] NET: Registered protocol family 1
>
> [    3.144411] RPC: Registered named UNIX socket transport module.
>
> [    3.144427] RPC: Registered udp transport module.
>
> [    3.144436] RPC: Registered tcp transport module.
>
> [    3.144445] RPC: Registered tcp NFSv4.1 backchannel transport module.
>
> [    3.145137] Unpacking initramfs...
>
> [    3.506105] Freeing initrd memory: 5008K (cfb1c000 - d0000000)
>
> [    3.506566] CPU PMU: Failed to parse /pmu/interrupt-affinity[0]
>
> [    3.506632] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 
>> counters available
>
> [    3.509988] futex hash table entries: 256 (order: 2, 16384 bytes)
>
> [    3.510135] audit: initializing netlink subsys (disabled)
>
> [    3.510220] audit: type=2000 audit(3.450:1): initialized
>
> [    3.524161] zpool: loaded
>
> [    3.524187] zbud: loaded
>
> [    3.524956] VFS: Disk quotas dquot_6.6.0
>
> [    3.525273] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 
>> bytes)
>
> [    3.528888] NFS: Registering the id_resolver key type
>
> [    3.528954] Key type id_resolver registered
>
> [    3.528963] Key type id_legacy registered
>
> [    3.528997] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
>
> [    3.529390] fuse init (API version 7.23)
>
> [    3.530181] SGI XFS with ACLs, security attributes, realtime, no debug 
>> enabled
>
> [    3.537109] NET: Registered protocol family 38
>
> [    3.537273] Block layer SCSI generic (bsg) driver version 0.4 loaded 
>> (major 250)
>
> [    3.537515] io scheduler noop registered
>
> [    3.537533] io scheduler deadline registered
>
> [    3.537598] io scheduler cfq registered (default)
>
> [    3.539374] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 
>> size 568
>
> [    3.543086] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
>
> [    3.544821] Serial: 8250/16550 driver, 6 ports, IRQ sharing disabled
>
> [    3.548629] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 158, 
>> base_baud = 3000000) is a 8250
>
> [    4.422455] console [ttyS0] enabled
>
> [    4.427580] [drm] Initialized drm 1.1.0 20060810
>
> [    4.432345] usbcore: registered new interface driver udl
>
> [    4.502668] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6
>
> [    4.508810] davinci_mdio 4a101000.mdio: detected phy mask fffffffb
>
> [    4.515342] davinci_mdio: dt: updated phy_id[2] from phy_mask[fffffffb]
>
> [    4.529813] libphy: 4a101000.mdio: probed
>
> [    4.533990] davinci_mdio 4a101000.mdio: phy[2]: device 
>> 4a101000.mdio:02, driver SMSC LAN8710/LAN8720
>
> [    4.544091] cpsw 4a100000.ethernet: Detected MACID = 7c:66:9d:57:29:dd
>
> [    4.552360] pegasus: v0.9.3 (2013/04/25), Pegasus/Pegasus II USB 
>> Ethernet driver
>
> [    4.560025] usbcore: registered new interface driver pegasus
>
> [    4.565795] usbcore: registered new interface driver rtl8150
>
> [    4.571543] usbcore: registered new interface driver r8152
>
> [    4.578834] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
>
> [    4.585490] ehci-pci: EHCI PCI platform driver
>
> [    4.590043] ehci-platform: EHCI generic platform driver
>
> [    4.595538] ehci-omap: OMAP-EHCI Host Controller driver
>
> [    4.602910] 47401300.usb-phy supply vcc not found, using dummy regulator
>
> [    4.646969] 47401b00.usb-phy supply vcc not found, using dummy regulator
>
> [    4.695409] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
>
> [    4.701558] musb-hdrc musb-hdrc.1.auto: new USB bus registered, 
>> assigned bus number 1
>
> [    4.709684] usb usb1: New USB device found, idVendor=1d6b, 
>> idProduct=0002
>
> [    4.716512] usb usb1: New USB device strings: Mfr=3, Product=2, 
>> SerialNumber=1
>
> [    4.723770] usb usb1: Product: MUSB HDRC host driver
>
> [    4.728760] usb usb1: Manufacturer: Linux 4.1.17-ti-rt-r46 musb-hcd
>
> [    4.735056] usb usb1: SerialNumber: musb-hdrc.1.auto
>
> [    4.741069] hub 1-0:1.0: USB hub found
>
> [    4.744886] hub 1-0:1.0: 1 port detected
>
> [    4.785445] mousedev: PS/2 mouse device common for all mice
>
> [    4.792158] omap_rtc 44e3e000.rtc: already running
>
> [    4.797592] omap_rtc 44e3e000.rtc: rtc core: registered 44e3e000.rtc as 
>> rtc0
>
> [    4.806109] i2c /dev entries driver
>
> [    4.809740] Driver for 1-wire Dallas network protocol.
>
> [    4.816955] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 
>> sec
>
> [    4.825057] omap_hsmmc 48060000.mmc: Got CD GPIO
>
> [    4.864850] omap-aes 53500000.aes: OMAP AES hw accel rev: 3.2
>
> [    4.876609] omap-sham 53100000.sham: hw accel on OMAP rev 4.3
>
> [    4.887131] hidraw: raw HID events driver (C) Jiri Kosina
>
> [    4.894264] usbcore: registered new interface driver usbhid
>
> [    4.899869] usbhid: USB HID core driver
>
> [    4.904177] ashmem: initialized
>
> [    4.908435]  remoteproc0: wkup_m3 is available
>
> [    4.910123] mmc0: host does not support reading read-only switch, 
>> assuming write-enable
>
> [    4.912076] mmc0: new high speed SDHC card at address b368
>
> [    4.922748] mmcblk0: mmc0:b368 NCard 7.48 GiB 
>
> [    4.924377]  mmcblk0: p1
>
> [    4.936343]  remoteproc0: Note: remoteproc is still under development 
>> and considered experimental.
>
> [    4.945346]  remoteproc0: THE BINARY FORMAT IS NOT YET FINALIZED, and 
>> backward compatibility isn't yet guaranteed.
>
> [    4.960638] NET: Registered protocol family 10
>
> [    4.966738] mip6: Mobile IPv6
>
> [    4.969750] NET: Registered protocol family 17
>
> [    4.974432] Key type dns_resolver registered
>
> [    4.978732] mpls_gso: MPLS GSO support
>
> [    4.982910] omap_voltage_late_init: Voltage driver support not added
>
> [    4.989839] cpu cpu0: of_pm_voltdm_notifier_register: Failed to get 
>> cpu0 regulator/voltdm: -517
>
> [    4.998591] cpu cpu0: cpu0 clock notifier not ready, retry
>
> [    5.004753] PM: bootloader does not support rtc-only!
>
> [    5.010094] ThumbEE CPU extension supported.
>
> [    5.014415] Registering SWP/SWPB emulation handler
>
> [    5.020432] registered taskstats version 1
>
> [    5.028054] Btrfs loaded
>
> [    5.053814] Key type encrypted registered
>
> [    5.061202] input: tps65217_pwr_but as 
>> /devices/platform/ocp/44e0b000.i2c/i2c-0/0-0024/input/input0
>
> [    5.092494] tps65217 0-0024: TPS65217 ID 0xe version 1.2
>
> [    5.098603] at24 0-0050: 32768 byte 24c256 EEPROM, writable, 1 
>> bytes/write
>
> [    5.105712] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
>
> [    5.113612] at24 2-0054: 32768 byte 24c256 EEPROM, writable, 1 
>> bytes/write
>
> [    5.121016] at24 2-0055: 32768 byte 24c256 EEPROM, writable, 1 
>> bytes/write
>
> [    5.128463] at24 2-0056: 32768 byte 24c256 EEPROM, writable, 1 
>> bytes/write
>
> [    5.135910] at24 2-0057: 32768 byte 24c256 EEPROM, writable, 1 
>> bytes/write
>
> [    5.142880] omap_i2c 4819c000.i2c: bus 2 rev0.11 at 100 kHz
>
> [    5.150142]  remoteproc0: powering up wkup_m3
>
> [    5.154587]  remoteproc0: Booting fw image am335x-pm-firmware.elf, size 
>> 219735
>
> [    5.156178] bone_capemgr bone_capemgr: Baseboard: 
>> 'A335BNLT,000C,2714BBBK0809'
>
> [    5.156196] bone_capemgr bone_capemgr: 
>> compatible-baseboard=ti,beaglebone-black - #slots=4
>
> [    5.172712] omap_i2c 4819c000.i2c: Arbitration lost
>
> [    5.182603]  remoteproc0: remote processor wkup_m3 is now up
>
> [    5.182670] wkup_m3_ipc 44e11324.wkup_m3_ipc: CM3 Firmware Version = 
>> 0x191
>
> [    6.241709] random: nonblocking pool is initialized
>
> [    8.002615] sched: RT throttling activated
>
> [    8.002699] i2c i2c-2: SCL is stuck low, exit recovery
>
>
>
 

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