sched: add trace points during system startup and board initialization

[Kaben123]

Add trace points to record transitions of g_nx_initstate and to mark board early/late initialization boundaries. Also add trace marks for RESET and PANIC to improve boot-time diagnostics and failure analysis.

Note: Please adhere to Contributing Guidelines.

Summary

This patch introduces trace points at key moments during system startup and board-level initialization to improve boot-time diagnostics and tracing. It records transitions of g_nx_initstate, adds begin/end trace markers around board initialization, and marks important events such as RESET and PANIC.

Motivation

Tracing the system initialization sequence helps debugging bring-up and failure analysis on multi-core and board bring-up scenarios. Recording g_nx_initstate transitions and board init boundaries provides better visibility into the boot sequence.

What was changed

• boards/boardctl.c

  • Include <nuttx/trace.h> and mark RESET when board reset is requested. Set g_nx_initstate = OSINIT_RESET before calling reboot notifier.

• sched/init/nx_bringup.c

  • Wrap board_late_initialize() with boards_trace_begin() / boards_trace_end().

• sched/init/nx_start.c

  • Emit sched_trace_mark() calls when updating g_nx_initstate for states: BOOT, TASKLISTS, MEMORY, HARDWARE, OSREADY, IDLELOOP.
  • Wrap board_early_initialize() with boards_trace_begin() / boards_trace_end().

• sched/misc/assert.c

  • Include <nuttx/trace.h> and emit a PANIC trace mark when entering the panic state.

Impact

• Functional behavior: No functional changes to logic; only additional trace calls. Should be safe when tracing is disabled.
• API/ABI: No public API or ABI changes.
• Risks: Minimal. Trace calls add negligible overhead when enabled.

Testing

• Built and booted on target device used during development.
• Observed trace markers during normal boot and when triggering reset/panic.
• Example observed marks: RESET, BOOT, TASKLISTS, MEMORY, HARDWARE, OSREADY, IDLELOOP, PANIC.

[acassis]

@Kaben123 Could you please update the https://nuttx.apache.org/docs/latest/debugging/tasktraceuser.html Documentation to include comments about system startup and board initialization