Smartphone Flash Tool -runtime Trace Mode-l May 2026

The string -runtime Trace Mode-l is not a simple toggle switch in the GUI. It is a command-line argument passed to the flash_tool.exe executable, primarily used in debugging builds of the SP Flash Tool (versions 5.x and above, common in engineering circles).

Let’s break it down:

When combined, Smartphone Flash Tool -runtime Trace Mode-l essentially turns the flashing utility into a real-time logic analyzer for the phone’s boot process. Smartphone Flash Tool -runtime Trace Mode-l

The following trace categories were captured during runtime:

  • Memory Operations
  • Error Injection (if tested)
  • Device Reboot

    • Before you can use Runtime Trace Mode, ensure: The string -runtime Trace Mode-l is not a

    Activating this mode is not for the faint of heart. It requires using the command line, not just the GUI. Here is the standard procedure for advanced users:

    Most users double-click the GUI. Experts use the command line. To access -runtime Trace Mode-l, follow these steps: When combined, Smartphone Flash Tool -runtime Trace Mode-l

    Unlike normal boot, enabling Trace Mode requires the device to enter META Mode or Preloader USB COM mode with trace buffers activated. The Preloader loads a tiny trace proxy firmware into internal SRAM, which configures the ETM/STM, allocates a circular buffer in DRAM, and streams data to the host via USB bulk endpoints.

    To become a true power user, combine the trace mode with other runtime arguments:

    | Command | Effect | | :--- | :--- | | -runtime Trace Mode -l 5 -s COM5 | Traces only over physical COM port 5 (bypasses USB stack issues). | | -runtime Trace Mode -l 5 -b 921600 | Sets baud rate for trace to 921600 (faster logging for large RAM dumps). | | -runtime Trace Mode -l 5 -o C:\traces\debug.log | Outputs the runtime trace directly to a persistent log file. |

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