= swapper =
==info==
* version: 20140312.1653
* device type:
=====================================
============itc SN===================
header: aa5533ee
oem: luna itc
model: T-7210
name: 小功率壁挂式终端
sn: f5051936
man date: year: 2013, week: 42
-----------------imodel--------------
screen size: 4.3
screen rotation: 180
pinmux: 1
development: 1
cap: 11
-----------func matrix---------------
GPIO键盘 (标配) : true
GPIO定制键盘: false
红外键盘: false
485点阵屏协议: false
485酒店协议: true
485银行协议: true
银行面板监听: true
USB蓝牙: true
USBwifi: true
USB3G网卡: true
USB存储：标配: true
USB鼠标键盘，禁用: false
移除检测: false
手柄检测: false
短路A组（标配）: true
短路B组（标配）: true
电源控制IO（标配）: true
优先控制IO: true
状态灯IO （标配）: false
SPI扩展16区: false
SPI扩展采集: false
SPI扩展电容键盘: false
SPI时钟显示: false
智能功放检测: false
模拟功率切换功能: false
aux音量模拟控制功能: false
MIC音量模拟控制功能: false
声压触发: false
优先级检测（声压）: true
Airplay: false
多方通话: false
交换机网卡: false
冗余双网卡: false
PPPOE: false
7202接收广播模式: false
7202发起广播模式: false
7203发起广播模式: false
普通对讲模式: false
监听模式: true
高铁面板: false
网络故障输出: false
-----------check sum-----------------
valid checksum: true
checksum: a1408fc6bcb691eca140bdc8bdd293b4
=====================================
* kernel log:
Pid: 0, comm: swapper
[ 1751.512115] CPU: 0 Not tainted (3.2.0-luna_itc+ #1)
[ 1751.528259] PC is at default_idle+0x2c/0x30
[ 1751.541137] LR is at default_idle+0x28/0x30
[ 1751.554016] pc : [] lr : [] psr: 60000013
[ 1751.554016] sp : c0791f90 ip : c0791fa0 fp : c0791f9c
[ 1751.589447] r10: 00000000 r9 : 413fc082 r8 : 80004059
[ 1751.605529] r7 : c079751c r6 : c0a42900 r5 : c0802f84 r4 : c0790000
[ 1751.625671] r3 : 00000000 r2 : c0791f90 r1 : c07b40b0 r0 : 00000001
[ 1751.645782] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
[ 1751.668334] Control: 10c5387d Table: 8f220019 DAC: 00000015
[ 1751.686035] Backtrace:
[ 1751.693603] [] (dump_backtrace+0x0/0x10c) from [] (dump_stack+0x18/0x1c)
[ 1751.719604] r6:00000008 r5:20000193 r4:c0791f48 r3:60000193
[ 1751.737091] [] (dump_stack+0x0/0x1c) from [] (show_regs+0x44/0x50)
[ 1751.761535] [] (show_regs+0x0/0x50) from [] (sysrq_handle_showregs+0x20/0x28)
[ 1751.788879] r4:c07cf5c0 r3:c07cd82c
[ 1751.799896] [] (sysrq_handle_showregs+0x0/0x28) from [] (__handle_sysrq+0xa8/0x14c)
[ 1751.828887] [] (__handle_sysrq+0x0/0x14c) from [] (handle_sysrq+0x28/0x2c)
[ 1751.855468] r8:00000070 r7:000000e9 r6:000000c6 r5:00000031 r4:00000070
[ 1751.875610] r3:c0792568
[ 1751.883666] [] (handle_sysrq+0x0/0x2c) from [] (serial_omap_irq+0x214/0x774)
[ 1751.910766] r4:cf9a2200 r3:00000001
[ 1751.921813] [] (serial_omap_irq+0x0/0x774) from [] (handle_irq_event_percpu+0x38/0x1a0)
[ 1751.951843] [] (handle_irq_event_percpu+0x0/0x1a0) from [] (handle_irq_event+0x30/0x40)
[ 1751.981903] [] (handle_irq_event+0x0/0x40) from [] (handle_level_irq+0xbc/0xe4)
[ 1752.009826] r4:c07b67bc r3:00020000
[ 1752.020843] [] (handle_level_irq+0x0/0xe4) from [] (generic_handle_irq+0x28/0x38)
[ 1752.049285] r4:00000048 r3:c0072d30
[ 1752.060302] [] (generic_handle_irq+0x0/0x38) from [] (handle_IRQ+0x68/0x8c)
[ 1752.087127] r4:00000048 r3:0000018c
[ 1752.098144] [] (handle_IRQ+0x0/0x8c) from [] (omap3_intc_handle_irq+0x6c/0x7c)
[ 1752.125793] r5:c0791f48 r4:00000048
[ 1752.136810] [] (omap3_intc_handle_irq+0x0/0x7c) from [] (__irq_svc+0x40/0x60)
[ 1752.164184] Exception stack(0xc0791f48 to 0xc0791f90)
[ 1752.179748] 1f40: 00000001 c07b40b0 c0791f90 00000000 c0790000 c0802f84
[ 1752.204956] 1f60: c0a42900 c079751c 80004059 413fc082 00000000 c0791f9c c0791fa0 c0791f90
[ 1752.230194] 1f80: c0014990 c0014994 60000013 ffffffff
[ 1752.245758] r7:c0791f7c r6:ffffffff r5:60000013 r4:c0014994
[ 1752.263214] [] (default_idle+0x0/0x30) from [] (cpu_idle+0x50/0x90)
[ 1752.287933] [] (cpu_idle+0x0/0x90) from [] (rest_init+0x60/0x78)
[ 1752.311798] r5:c06a61b4 r4:c0792104
[ 1752.322845] [] (rest_init+0x0/0x78) from [] (start_kernel+0x248/0x28c)
[ 1752.348327] [] (start_kernel+0x0/0x28c) from [<80008040>] (0x80008040)
==solution==
* swaper does a idle job
* refer to:
** [[http://superuser.com/questions/377572/what-is-the-main-purpose-of-the-swapper-process-in-unix swapper in unix]]
** [[http://stackoverflow.com/questions/464483/why-do-we-need-a-swapper-task-in-linux swapper in linux]]
* solution: NOT FOUND YET
=SysRq : HELP reboot=
==info==
* version: 20140312.1653
* device type:
=====================================
============itc SN===================
header: aa5533ee
oem: luna itc
model: T-7210
name: 小功率壁挂式终端
sn: f5051936
man date: year: 2013, week: 42
-----------------imodel--------------
screen size: 4.3
screen rotation: 180
pinmux: 1
development: 1
cap: 11
-----------func matrix---------------
GPIO键盘 (标配) : true
GPIO定制键盘: false
红外键盘: false
485点阵屏协议: false
485酒店协议: true
485银行协议: true
银行面板监听: true
USB蓝牙: true
USBwifi: true
USB3G网卡: true
USB存储：标配: true
USB鼠标键盘，禁用: false
移除检测: false
手柄检测: false
短路A组（标配）: true
短路B组（标配）: true
电源控制IO（标配）: true
优先控制IO: true
状态灯IO （标配）: false
SPI扩展16区: false
SPI扩展采集: false
SPI扩展电容键盘: false
SPI时钟显示: false
智能功放检测: false
模拟功率切换功能: false
aux音量模拟控制功能: false
MIC音量模拟控制功能: false
声压触发: false
优先级检测（声压）: true
Airplay: false
多方通话: false
交换机网卡: false
冗余双网卡: false
PPPOE: false
7202接收广播模式: false
7202发起广播模式: false
7203发起广播模式: false
普通对讲模式: false
监听模式: true
高铁面板: false
网络故障输出: false
-----------check sum-----------------
valid checksum: true
checksum: a1408fc6bcb691eca140bdc8bdd293b4
=====================================
* kernel log:
[ 1754.652954] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
[ 1768.179809] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
[ 1802.434661] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
[ 1802.751403] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
[ 1804.064910] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
[ 1820.162963] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
[ 1878.839782] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
[ 1888.161590] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
[ 1904.546264] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
[ 1904.626037] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
[ 1921.430877] SysRq : HELP : loglevel(0-9) reBoot Crash terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J) saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W)
==solution==
* descrption: system reboot trigger by a key sequence
* refer:
** [[http://plugcomputer.org/plugforum/index.php?topic=5797.0;wap2 general case]]
** [[http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=9006 raspberry pi uart]]
* solution: with further investigation, we do attach the uart line with this device, it may be caused by touching on the RxD line described by 'raspberry pi uart'. Very likely.