I tried build 2.6.37 mainline kernel which was just released with the Ubuntu Natty ti-omap4 kernel config. 2.6.37 kernel boots fine with our Ubuntu Natty minimal root file system. But I can still reproduce this issue. I will post this issue to upstream mail list for more attention. == [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Linux version 2.6.37+ (roc@tangerine) (gcc version 4.4.5 20100824 (prerelease) (Ubuntu/Linaro 4.4.4-9ubuntu2) ) 1 [ 0.000000] CPU: ARMv7 Processor [411fc092] revision 2 (ARMv7), cr=10c53c7f [ 0.000000] CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] Machine: OMAP4 Panda board [ 0.000000] Memory policy: ECC disabled, Data cache writealloc [ 0.000000] OMAP4430 ES2.0 [ 0.000000] SRAM: Mapped pa 0x40300000 to va 0xfe400000 size: 0xe000 [ 0.000000] FIXME: omap44xx_sram_init not implemented [ 0.000000] On node 0 totalpages: 262144 [ 0.000000] free_area_init_node: node 0, pgdat c06f13c0, node_mem_map c0772000 [ 0.000000] Normal zone: 1536 pages used for memmap [ 0.000000] Normal zone: 0 pages reserved [ 0.000000] Normal zone: 195072 pages, LIFO batch:31 [ 0.000000] HighMem zone: 512 pages used for memmap [ 0.000000] HighMem zone: 65024 pages, LIFO batch:15 [ 0.000000] PERCPU: Embedded 7 pages/cpu @c0f7a000 s7104 r8192 d13376 u32768 [ 0.000000] pcpu-alloc: s7104 r8192 d13376 u32768 alloc=8*4096 [ 0.000000] pcpu-alloc: [0] 0 [0] 1 [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 260096 [ 0.000000] Kernel command line: console=ttyS2,115200n8 console=ttyO2,115200n8 noinitrd root=/dev/mmcblk0p2 rootdelay=1 ip=dG [ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes) [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) [ 0.000000] allocated 5242880 bytes of page_cgroup [ 0.000000] please try 'cgroup_disable=memory' option if you don't want memory cgroups [ 0.000000] Memory: 1024MB = 1024MB total [ 0.000000] Memory: 1026756k/1026756k available, 21820k reserved, 262144K highmem [ 0.000000] Virtual kernel memory layout: [ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB) [ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB) [ 0.000000] DMA : 0xffc00000 - 0xffe00000 ( 2 MB) [ 0.000000] vmalloc : 0xf0800000 - 0xf8000000 ( 120 MB) [ 0.000000] lowmem : 0xc0000000 - 0xf0000000 ( 768 MB) [ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB) [ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB) [ 0.000000] .init : 0xc0008000 - 0xc003d000 ( 212 kB) [ 0.000000] .text : 0xc003d000 - 0xc06a9bec (6579 kB) [ 0.000000] .data : 0xc06aa000 - 0xc06f6ec0 ( 308 kB) [ 0.000000] SLUB: Genslabs=13, HWalign=32, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 [ 0.000000] Preemptable hierarchical RCU implementation. [ 0.000000] RCU-based detection of stalled CPUs is disabled. [ 0.000000] Verbose stalled-CPUs detection is disabled. [ 0.000000] NR_IRQS:402 [ 0.000000] ------------[ cut here ]------------ [ 0.000000] WARNING: at arch/arm/mach-omap2/clockdomain.c:868 omap2_clkdm_deny_idle+0x50/0x80() [ 0.000000] clockdomain: OMAP4 wakeup/sleep dependency support is not yet implemented [ 0.000000] Modules linked in: [ 0.000000] [] (unwind_backtrace+0x0/0xe4) from [] (warn_slowpath_common+0x4c/0x64) [ 0.000000] [] (warn_slowpath_common+0x4c/0x64) from [] (warn_slowpath_fmt+0x2c/0x3c) [ 0.000000] [] (warn_slowpath_fmt+0x2c/0x3c) from [] (omap2_clkdm_deny_idle+0x50/0x80) [ 0.000000] [] (omap2_clkdm_deny_idle+0x50/0x80) from [] (clkdm_init+0x8c/0xc0) [ 0.000000] [] (clkdm_init+0x8c/0xc0) from [] (omap2_init_common_hw+0x18/0x94) [ 0.000000] [] (omap2_init_common_hw+0x18/0x94) from [] (omap4_panda_init_irq+0x10/0x1c) [ 0.000000] [] (omap4_panda_init_irq+0x10/0x1c) from [] (init_IRQ+0x10/0x18) [ 0.000000] [] (init_IRQ+0x10/0x18) from [] (start_kernel+0x120/0x2a0) [ 0.000000] [] (start_kernel+0x120/0x2a0) from [<80008038>] (0x80008038) [ 0.000000] ---[ end trace da227214a82491b7 ]--- [ 0.000000] omap_hwmod: dpll_mpu_m2_ck: missing clockdomain for dpll_mpu_m2_ck. [ 0.000000] GPMC revision 6.0 [ 0.000000] OMAP GPIO hardware version 0.1 [ 0.000000] OMAP clockevent source: GPTIMER1 at 32768 Hz [ 0.000000] Console: colour dummy device 80x30 [ 0.000000] Calibrating delay loop... 2009.29 BogoMIPS (lpj=7847936) [ 0.000000] pid_max: default: 32768 minimum: 301 [ 0.000000] Security Framework initialized [ 0.000000] AppArmor: AppArmor initialized [ 0.000000] Mount-cache hash table entries: 512 [ 0.000000] Initializing cgroup subsys ns [ 0.000000] ns_cgroup deprecated: consider using the 'clone_children' flag without the ns_cgroup. [ 0.000000] Initializing cgroup subsys cpuacct [ 0.000000] Initializing cgroup subsys memory [ 0.000000] Initializing cgroup subsys devices [ 0.000000] CPU: Testing write buffer coherency: ok [ 0.000000] Calibrating local timer... 491.17MHz. [ 0.000000] L310 cache controller enabled [ 0.000000] l2x0: 16 ways, CACHE_ID 0x410000c4, AUX_CTRL 0x0e070000, Cache size: 1048576 B [ 0.000000] CPU1: Booted secondary processor [ 0.000000] Brought up 2 CPUs [ 0.000000] SMP: Total of 2 processors activated (3972.37 BogoMIPS). [ 0.000000] devtmpfs: initialized [ 0.000000] regulator: core version 0.5 [ 0.000000] regulator: dummy: [ 0.000000] NET: Registered protocol family 16 [ 0.000000] hw-breakpoint: found 6 breakpoint and 1 watchpoint registers. [ 0.000000] hw-breakpoint: 1 breakpoint reserved for watchpoint single-step. [ 0.000000] hw-breakpoint: maximum watchpoint size is 4 bytes. [ 0.000000] hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available [ 0.000000] pm_dbg_init: only OMAP3 supported [ 0.000000] OMAP DMA hardware revision 0.0 [ 0.002532] bio: create slab at 0 [ 0.003326] SCSI subsystem initialized [ 0.004058] usbcore: registered new interface driver usbfs [ 0.004089] usbcore: registered new interface driver hub [ 0.004211] usbcore: registered new device driver usb [ 0.019378] i2c_omap i2c_omap.1: bus 1 rev4.0 at 400 kHz [ 0.034820] Skipping twl internal clock init and using bootloader value (unknown osc rate) [ 0.036376] twl6030: PIH (irq 39) chaining IRQs 368..387 [ 0.073394] regulator: VMMC: 1200 <--> 3000 mV at 3000 mV normal standby [ 0.074371] regulator: VPP: 1800 <--> 2500 mV at 1900 mV normal standby [ 0.075347] regulator: VUSIM: 1200 <--> 2900 mV at 1800 mV normal standby [ 0.075866] regulator: VANA: 2100 mV normal standby [ 0.076385] regulator: VCXIO: 1800 mV normal standby [ 0.076873] regulator: VDAC: 1800 mV normal standby [ 0.077392] regulator: VUSB: 3300 mV normal standby [ 0.078369] regulator: VAUX1_6030: 1000 <--> 3000 mV at 1800 mV normal standby [ 0.079345] regulator: VAUX2_6030: 1200 <--> 2800 mV at 1800 mV normal standby [ 0.080352] regulator: VAUX3_6030: 1000 <--> 3000 mV at 1200 mV normal standby [ 0.095581] i2c_omap i2c_omap.2: bus 2 rev4.0 at 400 kHz [ 0.110839] i2c_omap i2c_omap.3: bus 3 rev4.0 at 400 kHz [ 0.126068] i2c_omap i2c_omap.4: bus 4 rev4.0 at 400 kHz [ 0.126556] Advanced Linux Sound Architecture Driver Version 1.0.23. [ 0.126861] NetLabel: Initializing [ 0.126892] NetLabel: domain hash size = 128 [ 0.126892] NetLabel: protocols = UNLABELED CIPSOv4 [ 0.126953] NetLabel: unlabeled traffic allowed by default [ 0.126983] Switching to clocksource 32k_counter [ 0.133544] AppArmor: AppArmor Filesystem Enabled [ 0.140747] musb_hdrc: version 6.0, musb-dma, otg (peripheral+host), debug=0 [ 0.140960] NET: Registered protocol family 2 [ 0.141174] IP route cache hash table entries: 32768 (order: 5, 131072 bytes) [ 0.142028] TCP established hash table entries: 131072 (order: 8, 1048576 bytes) [ 0.144104] TCP bind hash table entries: 65536 (order: 7, 786432 bytes) [ 0.145172] TCP: Hash tables configured (established 131072 bind 65536) [ 0.145172] TCP reno registered [ 0.145202] UDP hash table entries: 512 (order: 2, 16384 bytes) [ 0.145233] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes) [ 0.145507] NET: Registered protocol family 1 [ 0.145935] RPC: Registered udp transport module. [ 0.145965] RPC: Registered tcp transport module. [ 0.145965] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 0.146453] ------------[ cut here ]------------ [ 0.146484] WARNING: at arch/arm/mach-omap2/pm.c:64 _init_omap_device+0x80/0xa0() [ 0.146484] _init_omap_device: could not find omap_hwmod for iva [ 0.146514] Modules linked in: [ 0.146545] [] (unwind_backtrace+0x0/0xe4) from [] (warn_slowpath_common+0x4c/0x64) [ 0.146575] [] (warn_slowpath_common+0x4c/0x64) from [] (warn_slowpath_fmt+0x2c/0x3c) [ 0.146606] [] (warn_slowpath_fmt+0x2c/0x3c) from [] (_init_omap_device+0x80/0xa0) [ 0.146606] [] (_init_omap_device+0x80/0xa0) from [] (omap2_init_processor_devices+0x1c/0x78) [ 0.146636] [] (omap2_init_processor_devices+0x1c/0x78) from [] (omap2_common_pm_init+0x8/0x14) [ 0.146667] [] (omap2_common_pm_init+0x8/0x14) from [] (do_one_initcall+0x34/0xf8) [ 0.146697] [] (do_one_initcall+0x34/0xf8) from [] (do_initcalls+0x14/0x30) [ 0.146697] [] (do_initcalls+0x14/0x30) from [] (kernel_init+0x88/0x124) [ 0.146728] [] (kernel_init+0x88/0x124) from [] (kernel_thread_exit+0x0/0x8) [ 0.146759] ---[ end trace da227214a82491b8 ]--- [ 0.146850] ------------[ cut here ]------------ [ 0.146881] WARNING: at arch/arm/mach-omap2/pm.c:64 _init_omap_device+0x80/0xa0() [ 0.146881] _init_omap_device: could not find omap_hwmod for dsp [ 0.146881] Modules linked in: [ 0.146911] [] (unwind_backtrace+0x0/0xe4) from [] (warn_slowpath_common+0x4c/0x64) [ 0.146911] [] (warn_slowpath_common+0x4c/0x64) from [] (warn_slowpath_fmt+0x2c/0x3c) [ 0.146942] [] (warn_slowpath_fmt+0x2c/0x3c) from [] (_init_omap_device+0x80/0xa0) [ 0.146972] [] (_init_omap_device+0x80/0xa0) from [] (omap2_common_pm_init+0x8/0x14) [ 0.146972] [] (omap2_common_pm_init+0x8/0x14) from [] (do_one_initcall+0x34/0xf8) [ 0.147003] [] (do_one_initcall+0x34/0xf8) from [] (do_initcalls+0x14/0x30) [ 0.147003] [] (do_initcalls+0x14/0x30) from [] (kernel_init+0x88/0x124) [ 0.147033] [] (kernel_init+0x88/0x124) from [] (kernel_thread_exit+0x0/0x8) [ 0.147033] ---[ end trace da227214a82491b9 ]--- [ 0.147491] audit: initializing netlink socket (disabled) [ 0.147521] type=2000 audit(0.585:1): initialized [ 0.222503] highmem bounce pool size: 64 pages [ 0.227172] VFS: Disk quotas dquot_6.5.2 [ 0.227416] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) [ 0.230621] msgmni has been set to 1493 [ 0.231628] io scheduler noop registered [ 0.231658] io scheduler deadline registered [ 0.231719] io scheduler cfq registered (default) [ 0.235687] [drm] Initialized drm 1.1.0 20060810 [ 0.235748] omap-hsuart.0: ttyO0 at MMIO 0x4806a000 (irq = 104) is a OMAP UART0 [ 0.291076] omap-hsuart.1: ttyO1 at MMIO 0x4806c000 (irq = 105) is a OMAP UART1 [ 0.345794] omap-hsuart.2: ttyO2 at MMIO 0x48020000 (irq = 106) is a OMAP UART2 [ 1.381011] console [ttyO2] enabled [ 1.478607] omap-hsuart.3: ttyO3 at MMIO 0x4806e000 (irq = 102) is a OMAP UART3 [ 1.604034] brd: module loaded [ 1.609466] loop: module loaded [ 1.613708] usbcore: registered new interface driver smsc95xx [ 1.620056] mice: PS/2 mouse device common for all mice [ 1.625976] twl_rtc twl_rtc: rtc core: registered twl_rtc as rtc0 [ 1.635894] i2c /dev entries driver [ 1.640075] lirc_dev: IR Remote Control driver registered, major 250 [ 1.646820] Linux video capture interface: v2.00 [ 1.651672] Driver for 1-wire Dallas network protocol. [ 1.657104] 1-Wire driver for the DS2760 battery monitor chip - (c) 2004-2005, Szabolcs Gyurko [ 2.666107] i2c_omap i2c_omap.1: controller timed out [ 3.681701] i2c_omap i2c_omap.1: controller timed out [ 4.697357] i2c_omap i2c_omap.2: controller timed out [ 5.712921] i2c_omap i2c_omap.2: controller timed out [ 6.728851] i2c_omap i2c_omap.2: controller timed out [ 7.743530] i2c_omap i2c_omap.2: controller timed out [ 8.760467] i2c_omap i2c_omap.3: controller timed out [ 9.774932] i2c_omap i2c_omap.3: controller timed out [ 10.791595] i2c_omap i2c_omap.3: controller timed out [ 11.806671] i2c_omap i2c_omap.3: controller timed out [ 12.822570] i2c_omap i2c_omap.4: controller timed out [ 13.837371] i2c_omap i2c_omap.4: controller timed out [ 14.854125] i2c_omap i2c_omap.4: controller timed out [ 15.868743] i2c_omap i2c_omap.4: controller timed out [ 15.884429] omap_device: omap_wdt.-1: new worst case activate latency 0: 30517 [ 15.892456] OMAP Watchdog Timer Rev 0x00: initial timeout 60 sec [ 15.899108] device-mapper: uevent: version 1.0.3 [ 15.904235] device-mapper: ioctl: 4.18.0-ioctl (2010-06-29) initialised: