iMX53 - System reset when performing WiFi re-connect test

DonnyChiu · ‎05-27-2014

We bumped into a problem while doing WiFi re-connect test.

The test is simple, under Android, connect to an Access Point or Router, then disconnect it, then re-connect, then disconnect and keep looping this process.

Then after sometime, the system will suddenly reboot.

This problem doesn't occur very often, and not too easy to repeat.

But we would like to at least know the reason behind it and see if there is any fix.

We are using Android 2.3.4,, which is based on BSP R10.3.2 on a iMX53 platform.

We are using a WiFi module that uses Marvell 88W8787 chipset, and the driver we uses is SD-UAPSTA-BT-FM-8787-LINUX2635-PXA920-14.66.9.p92-M2614322_AX-GPL.zip

Below is part of the log file when the reset problem occurs.

[Thu May 22 16:49:35.927 2014] The raw data count is 76

[Thu May 22 16:49:35.937 2014] The OS data count is 14

[Thu May 22 16:49:35.937 2014] PEN UP DECLARED

[Thu May 22 16:49:40.353 2014] Timeout cmd id (1400777140.720837) = 0xa9, act = 0x0

[Thu May 22 16:49:40.363 2014] a9 00 08 00 01 00 00 00 00 00 00 00 00 00 00 00

[Thu May 22 16:49:40.373 2014] BSS type = 0 BSS role= 0

[Thu May 22 16:49:40.373 2014] num_cmd_timeout = 1

[Thu May 22 16:49:40.373 2014] last_cmd_index = 1

[Thu May 22 16:49:40.373 2014] last_cmd_id = 0x0 0xa9 0x0 0x0 0x0

[Thu May 22 16:49:40.383 2014] last_cmd_act = 0x0 0x0 0x0 0x0 0x0

[Thu May 22 16:49:40.383 2014] last_cmd_resp_index = 0

[Thu May 22 16:49:40.383 2014] last_cmd_resp_id = 0x0 0x0 0x0 0x0 0x0

[Thu May 22 16:49:40.393 2014] last_event_index = 0

[Thu May 22 16:49:40.393 2014] last_event = 0x0 0x0 0x0 0x0 0x0

[Thu May 22 16:49:40.393 2014] num_data_h2c_failure = 0

[Thu May 22 16:49:40.403 2014] num_cmd_h2c_failure = 0

[Thu May 22 16:49:40.403 2014] num_data_c2h_failure = 0

[Thu May 22 16:49:40.403 2014] num_cmdevt_c2h_failure = 0

[Thu May 22 16:49:40.403 2014] num_int_read_failure = 0

[Thu May 22 16:49:40.413 2014] last_int_status = 0

[Thu May 22 16:49:40.413 2014] num_event_deauth = 0

[Thu May 22 16:49:40.413 2014] num_event_disassoc = 0

[Thu May 22 16:49:40.413 2014] num_event_link_lost = 0

[Thu May 22 16:49:40.413 2014] num_cmd_deauth = 0

[Thu May 22 16:49:40.413 2014] num_cmd_assoc_success = 0

[Thu May 22 16:49:40.423 2014] num_cmd_assoc_failure = 0

[Thu May 22 16:49:40.423 2014] cmd_resp_received=0

[Thu May 22 16:49:40.423 2014] event_received=0

[Thu May 22 16:49:40.423 2014] max_tx_buf_size=2048

[Thu May 22 16:49:40.423 2014] tx_buf_size=2048

[Thu May 22 16:49:40.433 2014] curr_tx_buf_size=2048

[Thu May 22 16:49:40.433 2014] data_sent=1 cmd_sent=1

[Thu May 22 16:49:40.433 2014] ps_mode=1 ps_state=0

[Thu May 22 16:49:40.433 2014] wakeup_dev_req=0 wakeup_tries=0

[Thu May 22 16:49:40.433 2014] hs_configured=0 hs_activated=0

[Thu May 22 16:49:40.443 2014] pps_uapsd_mode=0 sleep_pd=0

[Thu May 22 16:49:40.443 2014] tx_lock_flag = 0

[Thu May 22 16:49:40.443 2014] scan_processing = 0

[Thu May 22 16:49:40.443 2014] mp_rd_bitmap=0x0 curr_rd_port=0x1

[Thu May 22 16:49:40.443 2014] mp_wr_bitmap=0x0 curr_wr_port=0x1

[Thu May 22 16:49:40.453 2014] Driver version = SD8787-0.0.0.p0-M2614322-GPL-(FP66)

[Thu May 22 16:49:40.453 2014] main_state = 0

[Thu May 22 16:49:40.453 2014] ioctl_pending = 0

[Thu May 22 16:49:40.463 2014] tx_pending = 0

[Thu May 22 16:49:40.463 2014] rx_pending = 0

[Thu May 22 16:49:40.463 2014] malloc_count = 34

[Thu May 22 16:49:40.463 2014] lock_count = 53

[Thu May 22 16:49:40.473 2014] mbufalloc_count = 0

[Thu May 22 16:49:40.473 2014] hs_skip_count = 0

[Thu May 22 16:49:40.473 2014] hs_force_count = 0

[Thu May 22 16:49:40.473 2014] clk_enable cannot be called in an interrupt context

[Thu May 22 16:49:40.483 2014] [<c00905cc>] (unwind_backtrace+0x0/0xf0) from [<c009d4e4>] (clk_enable+0x34/0x158)

[Thu May 22 16:49:40.483 2014] [<c009d4e4>] (clk_enable+0x34/0x158) from [<c0369754>] (sdhci_enable_sdio_irq+0x24/0x140)

[Thu May 22 16:49:40.494 2014] [<c0369754>] (sdhci_enable_sdio_irq+0x24/0x140) from [<c03694b0>] (sdhci_irq+0x778/0x7b0)

[Thu May 22 16:49:40.504 2014] [<c03694b0>] (sdhci_irq+0x778/0x7b0) from [<c00e9a3c>] (handle_IRQ_event+0x24/0xe4)

[Thu May 22 16:49:40.504 2014] [<c00e9a3c>] (handle_IRQ_event+0x24/0xe4) from [<c00ebc34>] (handle_level_irq+0xdc/0x188)

[Thu May 22 16:49:40.514 2014] [<c00ebc34>] (handle_level_irq+0xdc/0x188) from [<c008b06c>] (asm_do_IRQ+0x6c/0x8c)

[Thu May 22 16:49:40.524 2014] [<c008b06c>] (asm_do_IRQ+0x6c/0x8c) from [<c008bacc>] (__irq_svc+0x4c/0xcc)

[Thu May 22 16:49:40.534 2014] Exception stack(0xc91fbd70 to 0xc91fbdb8)

[Thu May 22 16:49:40.534 2014] bd60: 00000000 00f0003f c91fbdb8 00000000

[Thu May 22 16:49:40.544 2014] bd80: 00000000 40000013 c91fbdfc 00000000 00000000 c91fbe34 00000000 00000000

[Thu May 22 16:49:40.544 2014] bda0: 00000003 c91fbdb8 c009d304 c009d5c0 60000013 ffffffff

[Thu May 22 16:49:40.554 2014] [<c008bacc>] (__irq_svc+0x4c/0xcc) from [<c009d5c0>] (clk_enable+0x110/0x158)

[Thu May 22 16:49:40.564 2014] [<c009d5c0>] (clk_enable+0x110/0x158) from [<c0369894>] (sdhci_request+0x24/0x154)

[Thu May 22 16:49:40.614 2014] [<c0369894>] (sdhci_request+0x24/0x154) from [<c03609bc>] (mmc_wait_for_req+0x118/0x12c)

[Thu May 22 16:49:40.634 2014] [<c03609bc>] (mmc_wait_for_req+0x118/0x12c) from [<c0360a34>] (mmc_wait_for_cmd+0x64/0x74)

[Thu May 22 16:49:40.634 2014] [<c0360a34>] (mmc_wait_for_cmd+0x64/0x74) from [<c0364bd0>] (mmc_io_rw_direct_host+0xc0/0x124)

[Thu May 22 16:49:40.634 2014] [<c0364bd0>] (mmc_io_rw_direct_host+0xc0/0x124) from [<c0365b3c>] (sdio_f0_readb+0x4c/0x74)

[Thu May 22 16:49:40.634 2014] [<c0365b3c>] (sdio_f0_readb+0x4c/0x74) from [<bf2fca24>] (woal_sdio_reg_dbg+0x104/0x218 [sd8xxx])

[Thu May 22 16:49:40.634 2014] [<bf2fca24>] (woal_sdio_reg_dbg+0x104/0x218 [sd8xxx]) from [<bf2fcb78>] (woal_main_work_queue+0x40/0xf8 [sd8xxx])

[Thu May 22 16:49:40.644 2014] [<bf2fcb78>] (woal_main_work_queue+0x40/0xf8 [sd8xxx]) from [<c00c5624>] (worker_thread+0x17c/0x228)

[Thu May 22 16:49:40.654 2014] [<c00c5624>] (worker_thread+0x17c/0x228) from [<c00c8c90>] (kthread+0x78/0x80)

[Thu May 22 16:49:40.654 2014] [<c00c8c90>] (kthread+0x78/0x80) from [<c008ca20>] (kernel_thread_exit+0x0/0x8)

[Thu May 22 16:49:40.654 2014] kernel BUG at arch/arm/plat-mxc/clock.c:178!

[Thu May 22 16:49:40.654 2014] Unable to handle kernel NULL pointer dereference at virtual address 00000000

[Thu May 22 16:49:40.654 2014] pgd = c0004000

[Thu May 22 16:49:40.654 2014] [00000000] *pgd=00000000

[Thu May 22 16:49:40.654 2014] Internal error: Oops: 817 [#1] PREEMPT

[Thu May 22 16:49:40.664 2014] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state

[Thu May 22 16:49:40.664 2014] Modules linked in: sd8xxx(-) mlan(P) [last unloaded: mlan]

[Thu May 22 16:49:40.674 2014] CPU: 0 Tainted: P (2.6.35.3-gf221a2c #1)

[Thu May 22 16:49:40.674 2014] PC is at __bug+0x18/0x24

[Thu May 22 16:49:40.674 2014] LR is at __bug+0x14/0x24

[Thu May 22 16:49:40.684 2014] pc : [<c008ee90>] lr : [<c008ee8c>] psr: 60000193

[Thu May 22 16:49:40.684 2014] sp : c91fbce0 ip : d50f2000 fp : 00000000

[Thu May 22 16:49:40.694 2014] r10: 00000000 r9 : c91fa000 r8 : 00000001

[Thu May 22 16:49:40.694 2014] r7 : 00000001 r6 : 00000000 r5 : 00000000 r4 : c0636904

[Thu May 22 16:49:40.704 2014] r3 : 00000000 r2 : c91fbcd4 r1 : c058a9c7 r0 : 00000033

[Thu May 22 16:49:40.704 2014] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel

[Thu May 22 16:49:40.714 2014] Control: 10c5387d Table: 8191c019 DAC: 00000017

[Thu May 22 16:49:40.714 2014] Process MOAL_WORK_QUEUE (pid: 17191, stack limit = 0xc91fa2e8)

[Thu May 22 16:49:40.724 2014] Stack: (0xc91fbce0 to 0xc91fc000)

[Thu May 22 16:49:40.724 2014] bce0: c0636904 c009d4f0 d345d600 00000000 00000000 c0369754 d345d400 00000100

[Thu May 22 16:49:40.734 2014] bd00: 00000000 c03694b0 00000002 d345d600 00010002 d344ab00 00000000 00000000

[Thu May 22 16:49:40.734 2014] bd20: 00000002 00000001 c91fa000 00000000 00000000 c00e9a3c c063d044 00000002

[Thu May 22 16:49:40.744 2014] bd40: d344ab00 00000002 00000001 c00ebc34 00000002 00000000 00000001 c008b06c

[Thu May 22 16:49:40.754 2014] bd60: ffffffff d5000000 00000001 c008bacc 00000000 00f0003f c91fbdb8 00000000

[Thu May 22 16:49:40.754 2014] bd80: 00000000 40000013 c91fbdfc 00000000 00000000 c91fbe34 00000000 00000000

[Thu May 22 16:49:40.764 2014] bda0: 00000003 c91fbdb8 c009d304 c009d5c0 60000013 ffffffff d345d600 d345d400

[Thu May 22 16:49:40.774 2014] bdc0: c91fbdfc c0369894 c91fbdfc d345d400 c91fbde0 c03609bc d345d400 00000000

[Thu May 22 16:49:40.774 2014] bde0: c91fbde0 c91fbde0 c91fbe34 d345d400 c91fbdfc c0360a34 e1a01007 c91fbe34

[Thu May 22 16:49:40.784 2014] be00: 00000000 00000000 c91fbddc c0360ae8 e3a03001 d345d400 00000000 c91fbe97

[Thu May 22 16:49:40.794 2014] be20: 00000001 c0364bd0 c91fbec8 00000000 bf32103e 00000034 00000000 00000000

[Thu May 22 16:49:40.794 2014] be40: 00000000 00000000 00000000 00000195 00000000 00000000 00000000 c91fbdfc

[Thu May 22 16:49:40.804 2014] be60: 00000000 c91fbf4c c91fbeb8 00000000 00000009 00000000 00000000 c91fbece

[Thu May 22 16:49:40.814 2014] be80: c948c600 c0365b3c 00000000 c91fbe97 c91fbf4c d1f30de0 00000000 bf2fca24

[Thu May 22 16:49:40.814 2014] bea0: 00000009 e59a3000 e3130080 0a000001 0000003c 00000028 4f494453 6e754620

[Thu May 22 16:49:40.834 2014] bec0: 28203063 2d307830 29397830 0000203a 00000000 00000000 00000000 00000000

[Thu May 22 16:49:40.834 2014] bee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[Thu May 22 16:49:40.844 2014] bf00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[Thu May 22 16:49:40.844 2014] bf20: 00000000 00000000 00000000 00000000 00000000 00000000 00000028 00000030

[Thu May 22 16:49:40.854 2014] bf40: 00000034 00000038 0000003c 00000000 d1a76300 c948c600 c948c720 d1f30be8

[Thu May 22 16:49:40.864 2014] bf60: bf2fcb38 c91fbf94 c948c724 00000000 c948c720 bf2fcb78 c948c720 00000000

[Thu May 22 16:49:40.864 2014] bf80: d1f30be0 c91fa000 d1f30be0 c00c5624 00000000 00000000 d1a76300 c00c8fc4

[Thu May 22 16:49:40.874 2014] bfa0: c91fbfa0 c91fbfa0 00000000 d31b3da8 c91fbfd4 c00c54a8 d1f30be0 00000000

[Thu May 22 16:49:40.884 2014] bfc0: 00000000 00000000 00000000 c00c8c90 00000000 00000000 c91fbfd8 c91fbfd8

[Thu May 22 16:49:40.884 2014] bfe0: 00000000 d31b3da8 c00c8c18 c008ca20 00000013 c008ca20 e1a01006 e1a02007

[Thu May 22 16:49:40.894 2014] [<c008ee90>] (__bug+0x18/0x24) from [<c009d4f0>] (clk_enable+0x40/0x158)

[Thu May 22 16:49:40.904 2014] [<c009d4f0>] (clk_enable+0x40/0x158) from [<c0369754>] (sdhci_enable_sdio_irq+0x24/0x140)

[Thu May 22 16:49:40.904 2014] [<c0369754>] (sdhci_enable_sdio_irq+0x24/0x140) from [<c03694b0>] (sdhci_irq+0x778/0x7b0)

[Thu May 22 16:49:40.914 2014] [<c03694b0>] (sdhci_irq+0x778/0x7b0) from [<c00e9a3c>] (handle_IRQ_event+0x24/0xe4)

[Thu May 22 16:49:40.924 2014] [<c00e9a3c>] (handle_IRQ_event+0x24/0xe4) from [<c00ebc34>] (handle_level_irq+0xdc/0x188)

[Thu May 22 16:49:40.934 2014] [<c00ebc34>] (handle_level_irq+0xdc/0x188) from [<c008b06c>] (asm_do_IRQ+0x6c/0x8c)

[Thu May 22 16:49:40.934 2014] [<c008b06c>] (asm_do_IRQ+0x6c/0x8c) from [<c008bacc>] (__irq_svc+0x4c/0xcc)

[Thu May 22 16:49:40.944 2014] Exception stack(0xc91fbd70 to 0xc91fbdb8)

[Thu May 22 16:49:40.944 2014] bd60: 00000000 00f0003f c91fbdb8 00000000

[Thu May 22 16:49:40.954 2014] bd80: 00000000 40000013 c91fbdfc 00000000 00000000 c91fbe34 00000000 00000000

[Thu May 22 16:49:40.964 2014] bda0: 00000003 c91fbdb8 c009d304 c009d5c0 60000013 ffffffff

[Thu May 22 16:49:40.974 2014] [<c008bacc>] (__irq_svc+0x4c/0xcc) from [<c009d5c0>] (clk_enable+0x110/0x158)

[Thu May 22 16:49:40.974 2014] [<c009d5c0>] (clk_enable+0x110/0x158) from [<c0369894>] (sdhci_request+0x24/0x154)

[Thu May 22 16:49:40.984 2014] [<c0369894>] (sdhci_request+0x24/0x154) from [<c03609bc>] (mmc_wait_for_req+0x118/0x12c)

[Thu May 22 16:49:40.994 2014] [<c03609bc>] (mmc_wait_for_req+0x118/0x12c) from [<c0360a34>] (mmc_wait_for_cmd+0x64/0x74)

[Thu May 22 16:49:40.994 2014] [<c0360a34>] (mmc_wait_for_cmd+0x64/0x74) from [<c0364bd0>] (mmc_io_rw_direct_host+0xc0/0x124)

[Thu May 22 16:49:41.004 2014] [<c0364bd0>] (mmc_io_rw_direct_host+0xc0/0x124) from [<c0365b3c>] (sdio_f0_readb+0x4c/0x74)

[Thu May 22 16:49:41.014 2014] [<c0365b3c>] (sdio_f0_readb+0x4c/0x74) from [<bf2fca24>] (woal_sdio_reg_dbg+0x104/0x218 [sd8xxx])

[Thu May 22 16:49:41.024 2014] [<bf2fca24>] (woal_sdio_reg_dbg+0x104/0x218 [sd8xxx]) from [<bf2fcb78>] (woal_main_work_queue+0x40/0xf8 [sd8xxx])

[Thu May 22 16:49:41.034 2014] [<bf2fcb78>] (woal_main_work_queue+0x40/0xf8 [sd8xxx]) from [<c00c5624>] (worker_thread+0x17c/0x228)

[Thu May 22 16:49:41.044 2014] [<c00c5624>] (worker_thread+0x17c/0x228) from [<c00c8c90>] (kthread+0x78/0x80)

[Thu May 22 16:49:41.054 2014] [<c00c8c90>] (kthread+0x78/0x80) from [<c008ca20>] (kernel_thread_exit+0x0/0x8)

[Thu May 22 16:49:41.054 2014] Code: e92d4010 e59f000c eb10ad8a e3a03000 (e5833000)

[Thu May 22 16:49:41.064 2014] ---[ end trace c73d515ea4ed09b9 ]---

[Thu May 22 16:49:41.064 2014] Kernel panic - not syncing: Fatal exception in interrupt

[Thu May 22 16:49:41.074 2014] [<c00905cc>] (unwind_backtrace+0x0/0xf0) from [<c04ba444>] (panic+0x6c/0xe0)

[Thu May 22 16:49:41.074 2014] [<c04ba444>] (panic+0x6c/0xe0) from [<c008f460>] (die+0x2b4/0x304)

[Thu May 22 16:49:41.084 2014] [<c008f460>] (die+0x2b4/0x304) from [<c00913cc>] (__do_kernel_fault+0x64/0x84)

[Thu May 22 16:49:41.094 2014] [<c00913cc>] (__do_kernel_fault+0x64/0x84) from [<c00915ac>] (do_page_fault+0x1c0/0x1d4)

[Thu May 22 16:49:41.094 2014] [<c00915ac>] (do_page_fault+0x1c0/0x1d4) from [<c008b2c8>] (do_DataAbort+0x34/0x94)

[Thu May 22 16:49:41.104 2014] [<c008b2c8>] (do_DataAbort+0x34/0x94) from [<c008ba6c>] (__dabt_svc+0x4c/0x60)

[Thu May 22 16:49:41.114 2014] Exception stack(0xc91fbc98 to 0xc91fbce0)

[Thu May 22 16:49:41.114 2014] bc80: 00000033 c058a9c7

[Thu May 22 16:49:41.124 2014] bca0: c91fbcd4 00000000 c0636904 00000000 00000000 00000001 00000001 c91fa000

[Thu May 22 16:49:41.134 2014] bcc0: 00000000 00000000 d50f2000 c91fbce0 c008ee8c c008ee90 60000193 ffffffff

[Thu May 22 16:49:41.134 2014] [<c008ba6c>] (__dabt_svc+0x4c/0x60) from [<c008ee90>] (__bug+0x18/0x24)

[Thu May 22 16:49:41.144 2014] [<c008ee90>] (__bug+0x18/0x24) from [<c009d4f0>] (clk_enable+0x40/0x158)

[Thu May 22 16:49:41.154 2014] [<c009d4f0>] (clk_enable+0x40/0x158) from [<c0369754>] (sdhci_enable_sdio_irq+0x24/0x140)

[Thu May 22 16:49:41.154 2014] [<c0369754>] (sdhci_enable_sdio_irq+0x24/0x140) from [<c03694b0>] (sdhci_irq+0x778/0x7b0)

[Thu May 22 16:49:41.164 2014] [<c03694b0>] (sdhci_irq+0x778/0x7b0) from [<c00e9a3c>] (handle_IRQ_event+0x24/0xe4)

[Thu May 22 16:49:41.174 2014] [<c00e9a3c>] (handle_IRQ_event+0x24/0xe4) from [<c00ebc34>] (handle_level_irq+0xdc/0x188)

[Thu May 22 16:49:41.185 2014] [<c00ebc34>] (handle_level_irq+0xdc/0x188) from [<c008b06c>] (asm_do_IRQ+0x6c/0x8c)

[Thu May 22 16:49:41.195 2014] [<c008b06c>] (asm_do_IRQ+0x6c/0x8c) from [<c008bacc>] (__irq_svc+0x4c/0xcc)

[Thu May 22 16:49:41.195 2014] Exception stack(0xc91fbd70 to 0xc91fbdb8)

[Thu May 22 16:49:41.205 2014] bd60: 00000000 00f0003f c91fbdb8 00000000

[Thu May 22 16:49:41.205 2014] bd80: 00000000 40000013 c91fbdfc 00000000 00000000 c91fbe34 00000000 00000000

[Thu May 22 16:49:41.215 2014] bda0: 00000003 c91fbdb8 c009d304 c009d5c0 60000013 ffffffff

[Thu May 22 16:49:41.215 2014] [<c008bacc>] (__irq_svc+0x4c/0xcc) from [<c009d5c0>] (clk_enable+0x110/0x158)

[Thu May 22 16:49:41.235 2014] [<c009d5c0>] (clk_enable+0x110/0x158) from [<c0369894>] (sdhci_request+0x24/0x154)

[Thu May 22 16:49:41.235 2014] [<c0369894>] (sdhci_request+0x24/0x154) from [<c03609bc>] (mmc_wait_for_req+0x118/0x12c)

[Thu May 22 16:49:41.245 2014] [<c03609bc>] (mmc_wait_for_req+0x118/0x12c) from [<c0360a34>] (mmc_wait_for_cmd+0x64/0x74)

[Thu May 22 16:49:41.255 2014] [<c0360a34>] (mmc_wait_for_cmd+0x64/0x74) from [<c0364bd0>] (mmc_io_rw_direct_host+0xc0/0x124)

[Thu May 22 16:49:41.265 2014] [<c0364bd0>] (mmc_io_rw_direct_host+0xc0/0x124) from [<c0365b3c>] (sdio_f0_readb+0x4c/0x74)

[Thu May 22 16:49:41.265 2014] [<c0365b3c>] (sdio_f0_readb+0x4c/0x74) from [<bf2fca24>] (woal_sdio_reg_dbg+0x104/0x218 [sd8xxx])

[Thu May 22 16:49:41.275 2014] [<bf2fca24>] (woal_sdio_reg_dbg+0x104/0x218 [sd8xxx]) from [<bf2fcb78>] (woal_main_work_queue+0x40/0xf8 [sd8xxx])

[Thu May 22 16:49:41.285 2014] [<bf2fcb78>] (woal_main_work_queue+0x40/0xf8 [sd8xxx]) from [<c00c5624>] (worker_thread+0x17c/0x228)

[Thu May 22 16:49:41.295 2014] [<c00c5624>] (worker_thread+0x17c/0x228) from [<c00c8c90>] (kthread+0x78/0x80)

[Thu May 22 16:49:41.305 2014] [<c00c8c90>] (kthread+0x78/0x80) from [<c008ca20>] (kernel_thread_exit+0x0/0x8)

[Thu May 22 16:49:44.830 2014]

[Thu May 22 16:49:44.830 2014] U-Boot 2009.08 ( 5月 21 2014 - 14:13:10)

[Thu May 22 16:49:45.030 2014]

[Thu May 22 16:49:45.030 2014] CPU: Freescale i.MX53 family 2.1V at 800 MHz

[Thu May 22 16:49:45.030 2014] mx53 pll1: 800MHz

[Thu May 22 16:49:45.030 2014] mx53 pll2: 394MHz

[Thu May 22 16:49:45.030 2014] mx53 pll3: 216MHz

[Thu May 22 16:49:45.030 2014] mx53 pll4: 455MHz

[Thu May 22 16:49:45.030 2014] ipg clock : 65832000Hz

[Thu May 22 16:49:45.030 2014] ipg per clock : 32916000Hz

[Thu May 22 16:49:45.030 2014] uart clock : 65832000Hz

[Thu May 22 16:49:45.030 2014] cspi clock : 54000000Hz

[Thu May 22 16:49:45.030 2014] ahb clock : 131664000Hz

[Thu May 22 16:49:45.030 2014] axi_a clock : 394992000Hz

[Thu May 22 16:49:45.030 2014] axi_b clock : 197496000Hz

[Thu May 22 16:49:45.030 2014] emi_slow clock: 131664000Hz

[Thu May 22 16:49:45.030 2014] ddr clock : 394992000Hz

[Thu May 22 16:49:45.030 2014] esdhc1 clock : 78998400Hz

[Thu May 22 16:49:45.030 2014] esdhc2 clock : 78998400Hz

[Thu May 22 16:49:45.030 2014] esdhc3 clock : 78998400Hz

[Thu May 22 16:49:45.030 2014] esdhc4 clock : 78998400Hz

[Thu May 22 16:49:45.030 2014] nfc clock : 26332800Hz

[Thu May 22 16:49:45.030 2014] Board: MX53-JJ08 Rev. A

[Thu May 22 16:49:45.030 2014] Boot Reason: [WDOG]

[Thu May 22 16:49:45.030 2014] Boot Device: MMC

[Thu May 22 16:49:45.030 2014] I2C: ready

[Thu May 22 16:49:45.030 2014] DRAM: 512 MB

[Thu May 22 16:49:45.030 2014] MMC: FSL_ESDHC: 0, FSL_ESDHC: 1

[Thu May 22 16:49:45.210 2014] *** Warning - bad CRC or MMC, using default environment

alfred_liu · ‎05-27-2014

from the log, the reboot reason is a WDOG reset.

firstly please check the software why the system send out a WDOG reset.

also please check the 32.768k crystal to see if it's stable when rebooting.