# Troubleshoot using sample logs

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.
- 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.

Last Published: Dec 05, 2025

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