IPHONE5无限白苹果重启

{"os_version":"iOS 7.1 (11D167)","bug_type":"110"}
Incident Identifier: 8830630E-E69D-4063-851B-5C707E63D4E5
CrashReporter Key:   fa50783b302a95da3150f4c83ebd18f9685c6c19
Hardware Model:      iPhone5,2
Date/Time:           2014-04-08 08:21:05.856 +0800
OS Version:          iOS 7.1 (11D167)
panic(cpu 1 caller 0x8fa719b1): "IOP panic: h2fmi_dma_wAIt: WMR_PANIC: "dma timeout" drivers/apple/h2fmi/H2fmi_dma_iboot.c:182  "
Debugger message: panic
OS version: Not set yet
Kernel version: Darwin Kernel Version 14.0.0: Fri Feb 21 19:33:46 PST 2014; root:xnu-2423.10.67~1/RELEASE_ARM_S5L8950X
Kernel slide:     0x000000000ee00000
Kernel text base: 0x8ee01000
  Boot    : 0x534340c3 0x00000000
  Sleep   : 0x00000000 0x00000000
  Wake    : 0x00000000 0x00000000
  Calendar: 0x534340ce 0x000ed951
Panicked task 0xd001ac00: 75430 pages, 117 threads: pid 0: Kernel_task
panicked thread: 0xd0111330, backtrace: 0x889ebe90
                0x8ef19cd1
                0x8ef1a87f
                0x8ee04b55
                0x8fa719b1
                0x8fa70a8b
                0x8f0c0fc9
                0x8eed0fcb
                0x8ee1e61c
Task 0xd001ac00: 75430 pages, 117 threads: pid 0: kernel_task
Task 0xd001a950: 40 pages, 1 threads: pid 1: launchd
求解释