The low-level debugging over a serial port is know to be not very robust, esp when the platform has to do some initialization of the ports before serial drivers are loaded.
** Patch added: "Disable DEBUG_LL by default" https://bugs.launchpad.net/linaro-android/+bug/819723/+attachment/2409572/+files/0001-omap4-serial-Disable-DEBUG_LL-by-default.patch -- You received this bug notification because you are a member of Linaro Release Team, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/819723 Title: Panda-LEB Build hangs on bringup sometimes Status in Linaro Android: Confirmed Status in Linaro Texas Instruments Landing Team: New Bug description: U-Boot 2011.06 (Aug 02 2011 - 01:14:30) CPU : OMAP4430 Board: OMAP4 Panda I2C: ready DRAM: 1 GiB MMC: OMAP SD/MMC: 0 Using default environment Texas Instruments X-Loader 1.5.0 (Jul 5 2011 - 17:49:47) Reading boot sector Texas Instruments X-Loader 1.5.0 (Jul 5 2011 - 17:49:47) Reading boot sector Loading u-boot.bin from mmc U-Boot 2011.06 (Aug 02 2011 - 01:14:30) CPU : OMAP4430 Board: OMAP4 Panda I2C: ready DRAM: 1 GiB MMC: OMAP SD/MMC: 0 Using default environment In: serial Out: serial Err: serial Net: No ethernet found. Hit any key to stop autoboot: 0 reading boot.scr 457 bytes read Running bootscript from mmc0 ... ## Executing script at 82000000 reading uImage 4254024 bytes read reading uInitrd 168511 bytes read ## Booting kernel from Legacy Image at 80200000 ... Image Name: Linux-3.0.0+ Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 4253960 Bytes = 4.1 MiB Load Address: 80008000 Entry Point: 80008000 Verifying Checksum ... OK ## Loading init Ramdisk from Legacy Image at 81600000 ... Image Name: Android Ramdisk Image Image Type: ARM Linux RAMDisk Image (gzip compressed) Data Size: 168447 Bytes = 164.5 KiB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK Loading Kernel Image ... OK OK Starting kernel ... Uncompressing Linux... done, booting the kernel. <5>Linux version 3.0.0+ (jenkins-build@ip-10-38-67-90) (gcc version 4.6.2 20110630 (prerelease) (Lina ro GCC 4.6-2011.07-0) ) #1 SMP PREEMPT Tue Aug 2 02:09:32 UTC 2011 CPU: ARMv7 Processor [411fc092] revision 2 (ARMv7), cr=10c5387f CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache Machine: OMAP4430 Panda board <6>Reserving 50331648 bytes SDRAM for VRAM Memory policy: ECC disabled, Data cache writealloc <6>OMAP4430 ES2.1 <6>SRAM: Mapped pa 0x40300000 to va 0xfe400000 size: 0xe000 <7>On node 0 totalpages: 235520 <7>free_area_init_node: node 0, pgdat c0861d20, node_mem_map c162a000 <7> Normal zone: 1536 pages used for memmap <7> Normal zone: 0 pages reserved <7> Normal zone: 180736 pages, LIFO batch:31 <7> HighMem zone: 512 pages used for memmap <7> HighMem zone: 52736 pages, LIFO batch:15 <3>powerdomain: waited too long for powerdomain dss_pwrdm to complete transition <6>PERCPU: Embedded 7 pages/cpu @c1e3a000 s6976 r8192 d13504 u32768 <7>pcpu-alloc: s6976 r8192 d13504 u32768 alloc=8*4096 <7>pcpu-alloc: [0] 0 [0] 1 Built 1 zonelists in Zone order, mobility grouping on. Total pages: 233472 <5>Kernel command line: console=tty0 console=ttyO2,115200n8 rootwait ro earlyprintk fixrtc nocompcach e vram=48M omapfb.vram=0:24M,1:24M mem=456M@0x80000000 mem=512M@0xA0000000 init=/init androidboot.con sole=ttyO2 omapdss.def_disp=hdmi consoleblank=0 no_console_suspend <6>PID hash table entries: 4096 (order: 2, 16384 bytes) <6>Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) <6>Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) <6>Memory: 456MB 464MB = 920MB total <5>Memory: 918668k/918668k available, 72564k reserved, 212992K highmem <5>Virtual kernel memory layout: vector : 0xffff0000 - 0xffff1000 ( 4 kB) fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB) DMA : 0xffc00000 - 0xffe00000 ( 2 MB) vmalloc : 0xf0800000 - 0xf8000000 ( 120 MB) lowmem : 0xc0000000 - 0xf0000000 ( 768 MB) pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB) modules : 0xbf000000 - 0xbfe00000 ( 14 MB) .init : 0xc0008000 - 0xc004a000 ( 264 kB) .text : 0xc004a000 - 0xc07e8050 (7801 kB) .data : 0xc07ea000 - 0xc0863b00 ( 487 kB) .bss : 0xc0863b24 - 0xc0e3da48 (5992 kB) <6>Preemptible hierarchical RCU implementation. <6>NR_IRQS:410 <4>omap_hwmod: dpll_mpu_m2_ck: missing clockdomain for dpll_mpu_m2_ck. <6>OMAP clockevent source: GPTIMER1 at 32768 Hz <6>sched_clock: 32 bits at 32kHz, resolution 30517ns, wraps every 131071999ms <6>Console: colour dummy device 80x30 <6>console [tty0] enabled Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar ... MAX_LOCKDEP_SUBCLASSES: 8 ... MAX_LOCK_DEPTH: 48 ... MAX_LOCKDEP_KEYS: 8191 ... CLASSHASH_SIZE: 4096 ... MAX_LOCKDEP_ENTRIES: 16384 ... MAX_LOCKDEP_CHAINS: 32768 ... CHAINHASH_SIZE: 16384 memory used by lock dependency info: 3695 kB per task-struct memory footprint: 1152 bytes <6>Calibrating delay loop... <c>2007.19 BogoMIPS (lpj=7839744) <6>pid_max: default: 32768 minimum: 301 <6>Security Framework initialized <6>Mount-cache hash table entries: 512 <6>CPU: Testing write buffer coherency: ok <6>CPU0: thread -1, cpu 0, socket 0, mpidr 80000000 <4>twd_timer_setup: no clock found <6>Calibrating local timer... 492.01MHz. <6>L310 cache controller enabled <6>l2x0: 16 ways, CACHE_ID 0x410000c4, AUX_CTRL 0x5e470000, Cache size: 1048576 B CPU1: Booted secondary processor <6>CPU1: thread -1, cpu 1, socket 0, mpidr 80000001 <6>Brought up 2 CPUs <6>SMP: Total of 2 processors activated (3972.37 BogoMIPS). <6>devtmpfs: initialized <4>omap_hwmod: _populate_mpu_rt_base found no _mpu_rt_va for emif_fw <4>omap_hwmod: _populate_mpu_rt_base found no _mpu_rt_va for l3_instr <4>omap_hwmod: _populate_mpu_rt_base found no _mpu_rt_va for l3_main_1 <4>omap_hwmod: _populate_mpu_rt_base found no _mpu_rt_va for l3_main_2 <4>omap_hwmod: _populate_mpu_rt_base found no _mpu_rt_va for l4_abe <4>omap_hwmod: _populate_mpu_rt_base found no _mpu_rt_va for l4_cfg <4>omap_hwmod: _populate_mpu_rt_base found no _mpu_rt_va for l4_per <4>omap_hwmod: _populate_mpu_rt_base found no _mpu_rt_va for l4_wkup <4>omap_hwmod: _populate_mpu_rt_base found no _mpu_rt_va for mpu_private <4>omap_hwmod: _populate_mpu_rt_base found no _mpu_rt_va for dsp <4>omap_hwmod: l3_div_ck: missing clockdomain for l3_div_ck. <4>omap_hwmod: mcpdm: cannot be enabled (3) <6>print_constraints: dummy: <6>NET: Registered protocol family 16 <6>GPMC revision 6.0 <4>omap_device: omap_gpio.0: new worst case activate latency 0: 244140 <6>OMAP GPIO hardware version 0.1 <6>OMAP GPIO hardware version 0.1 <6>OMAP GPIO hardware version 0.1 <6>OMAP GPIO hardware version 0.1 <6>OMAP GPIO hardware version 0.1 <6>OMAP GPIO hardware version 0.1 <6>omap_mux_init: Add partition: #1: core, flags: 2 <6>omap_mux_init: Add partition: #2: wkup, flags: 2 <4>omap_device: omap_uart.1: new worst case activate latency 0: 122070 Kernel hangs.... 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