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The universal asynchronous receiver/transmitter (UART) logs enable you to monitor and debug the data exchanged between the Qualcomm Linux software and a device using a UART interface. The sample UART logs help you identify the various stages of system bootup. In the event of a crash, you can use these logs to do the following:
  • Determine the stage at which the crash occurred
  • Gain a high-level understanding of the execution process
PBL/XBL log The sample primary boot loader/eXtensible boot loader (PBL/XBL) log indicates the start and end of the PBL and XBL. UEFI log The UEFI log provides information about the start and end of UEFI. U-Boot log The U-Boot log provides information about the start and end of U-Boot. Linux log The sample log signifies the start of the Linux boot process. Capsule update logs The capsule update log provides information about the start and end of the capsule update.