启动原因
引导加载程序使用专用的硬件和内存资源来确定设备重新启动的原因，然后将 androidboot.bootreason=
启动原因规范
Android 9 之前
Android 9 及之后
源码
system/core/bootstat
const std::map<std::string, int32_t> kBootReasonMap = {
{"reboot,[empty]", kEmptyBootReason},
{"__BOOTSTAT_UNKNOWN__", kUnknownBootReason},
{"normal", 2},
{"recovery", 3},
{"reboot", 4},
{"PowerKey", 5},
{"hard_reset", 6},
{"kernel_panic", 7},
{"rpm_err", 8},
{"hw_reset", 9},
{"tz_err", 10},
{"adsp_err", 11},
{"modem_err", 12},
{"mba_err", 13},
{"Watchdog", 14},
{"Panic", 15},
{"power_key", 16},
{"power_on", 17},
{"Reboot", 18},
{"rtc", 19},
{"edl", 20},
{"oem_pon1", 21},
{"oem_powerkey", 22},
{"oem_unknown_reset", 23},
{"srto: HWWDT reset SC", 24},
{"srto: HWWDT reset platform", 25},
{"srto: bootloader", 26},
{"srto: kernel panic", 27},
{"srto: kernel watchdog reset", 28},
{"srto: normal", 29},
{"srto: reboot", 30},
{"srto: reboot-bootloader", 31},
{"srto: security watchdog reset", 32},
{"srto: wakesrc", 33},
{"srto: watchdog", 34},
{"srto:1-1", 35},
{"srto:omap_hsmm", 36},
{"srto:phy0", 37},
{"srto:rtc0", 38},
{"srto:touchpad", 39},
{"watchdog", 40},
{"watchdogr", 41},
{"wdog_bark", 42},
{"wdog_bite", 43},
{"wdog_reset", 44},
{"shutdown,", 45}, // Trailing comma is intentional. Do NOT use.
{"shutdown,userrequested", 46},
{"reboot,bootloader", 47},
{"reboot,cold", 48},
{"reboot,recovery", 49},
{"thermal_shutdown", 50},
{"s3_wakeup", 51},
{"kernel_panic,sysrq", 52},
{"kernel_panic,NULL", 53},
{"kernel_panic,null", 53},
{"kernel_panic,BUG", 54},
{"kernel_panic,bug", 54},
{"bootloader", 55},
{"cold", 56},
{"hard", 57},
{"warm", 58},
{"reboot,kernel_power_off_charging__reboot_system", 59}, // Can not happen
{"thermal-shutdown", 60},
{"shutdown,thermal", 61},
{"shutdown,battery", 62},
{"reboot,ota", 63},
{"reboot,factory_reset", 64},
{"reboot,", 65},
{"reboot,shell", 66},
{"reboot,adb", 67},
{"reboot,userrequested", 68},
{"shutdown,container", 69}, // Host OS asking Android Container to shutdown
{"cold,powerkey", 70},
{"warm,s3_wakeup", 71},
{"hard,hw_reset", 72},
{"shutdown,suspend", 73}, // Suspend to RAM
{"shutdown,hibernate", 74}, // Suspend to DISK
{"power_on_key", 75},
{"reboot_by_key", 76},
{"wdt_by_pass_pwk", 77},
{"reboot_longkey", 78},
{"powerkey", 79},
{"usb", 80},
{"wdt", 81},
{"tool_by_pass_pwk", 82},
{"2sec_reboot", 83},
{"reboot,by_key", 84},
{"reboot,longkey", 85},
{"reboot,2sec", 86}, // Deprecate in two years, replaced with cold,rtc,2sec
{"shutdown,thermal,battery", 87},
{"reboot,its_just_so_hard", 88}, // produced by boot_reason_test
{"reboot,Its Just So Hard", 89}, // produced by boot_reason_test
{"reboot,rescueparty", 90},
{"charge", 91},
{"oem_tz_crash", 92},
{"uvlo", 93}, // aliasReasons converts to reboot,undervoltage
{"oem_ps_hold", 94},
{"abnormal_reset", 95},
{"oemerr_unknown", 96},
{"reboot_fastboot_mode", 97},
{"watchdog_apps_bite", 98},
{"xpu_err", 99},
{"power_on_usb", 100},
{"watchdog_rpm", 101},
{"watchdog_nonsec", 102},
{"watchdog_apps_bark", 103},
{"reboot_dmverity_corrupted", 104},
{"reboot_smpl", 105}, // aliasReasons converts to reboot,powerloss
{"watchdog_sdi_apps_reset", 106},
{"smpl", 107}, // aliasReasons converts to reboot,powerloss
{"oem_modem_failed_to_powerup", 108},
{"reboot_normal", 109},
{"oem_lpass_cfg", 110},
{"oem_xpu_ns_error", 111},
{"power_key_press", 112},
{"hardware_reset", 113},
{"reboot_by_powerkey", 114},
{"reboot_verity", 115},
{"oem_rpm_undef_error", 116},
{"oem_crash_on_the_lk", 117},
{"oem_rpm_reset", 118},
{"reboot,powerloss", 119},
{"reboot,undervoltage", 120},
{"factory_cable", 121},
{"oem_ar6320_failed_to_powerup", 122},
{"watchdog_rpm_bite", 123},
{"power_on_cable", 124},
{"reboot_unknown", 125},
{"wireless_charger", 126},
{"0x776655ff", 127},
{"oem_thermal_bite_reset", 128},
{"charger", 129},
{"pon1", 130},
{"unknown", 131},
{"reboot_rtc", 132},
{"cold_boot", 133},
{"hard_rst", 134},
{"power-on", 135},
{"oem_adsp_resetting_the_soc", 136},
{"kpdpwr", 137},
{"oem_modem_timeout_waiting", 138},
{"usb_chg", 139},
{"warm_reset_0x02", 140},
{"warm_reset_0x80", 141},
{"pon_reason_0xb0", 142},
{"reboot_download", 143},
{"reboot_recovery_mode", 144},
{"oem_sdi_err_fatal", 145},
{"pmic_watchdog", 146},
{"software_master", 147},
{"cold,charger", 148},
{"cold,rtc", 149},
{"cold,rtc,2sec", 150},
{"reboot,tool", 151},
{"reboot,wdt", 152},
{"reboot,unknown", 153},
{"kernel_panic,audit", 154},
{"kernel_panic,atomic", 155},
{"kernel_panic,hung", 156},
{"kernel_panic,hung,rcu", 157},
{"kernel_panic,init", 158},
{"kernel_panic,oom", 159},
{"kernel_panic,stack", 160},
{"kernel_panic,sysrq,livelock,alarm", 161}, // llkd
{"kernel_panic,sysrq,livelock,driver", 162}, // llkd
{"kernel_panic,sysrq,livelock,zombie", 163}, // llkd
{"kernel_panic,modem", 164},
{"kernel_panic,adsp", 165},
{"kernel_panic,dsps", 166},
{"kernel_panic,wcnss", 167},
{"kernel_panic,_sde_encoder_phys_cmd_handle_ppdone_timeout", 168},
{"recovery,quiescent", 169},
{"reboot,quiescent", 170},
{"reboot,rtc", 171},
{"reboot,dm-verity_device_corrupted", 172},
{"reboot,dm-verity_enforcing", 173},
{"reboot,keys_clear", 174},
{"reboot,pmic_off_fault,.*", 175},
{"reboot,pmic_off_s3rst,.*", 176},
{"reboot,pmic_off_other,.*", 177},
};
