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The user-space reboot framework triggers the reboot using the kernel driver (drivers/firmware/psci/psci.c). You can run the following reboot commands using SSH: Table: Reboot commands
CommandDescription
reboot edlUse this command to restart the device into emergency download (EDL) mode. For more information about EDL mode, see Qualcomm Linux Build Guide.
reboot bootloaderUse this command to restart the device into fastboot mode. For more information about fastboot mode, see Qualcomm Linux Boot Guide.
You can use the following optional parameters with the reboot command. 
Reboot the system.

Options:
  --help        Show this help
  --halt        Halt the machine
-p --poweroff Switch off the machine
  --reboot      Reboot the machine
-f --force    Force immediate halt/power-off/reboot
-w --wtmp-only Don't halt/power-off/reboot, just write wtmp record
-d --no-wtmp  Don't write wtmp record
   --no-wall     Don't send wall message before halt/power-off/reboot

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