Add debug logging for setup()

Marlin/src/MarlinCore.cpp

   // UI must be initialized before EEPROM
   // (because EEPROM code calls the UI).
 
+  #if ENABLED(MARLIN_DEV_MODE)
+    auto log_current_ms = [&](PGM_P const msg) {
+      SERIAL_ECHO_START();
+      SERIAL_CHAR('['); SERIAL_ECHO(millis()); SERIAL_ECHO("] ");
+      serialprintPGM(msg);
+      SERIAL_EOL();
+    };
+    #define SETUP_LOG(M) log_current_ms(PSTR(M))
+  #else
+    #define SETUP_LOG(...) NOOP
+  #endif
+  #define SETUP_RUN(C) do{ SETUP_LOG(STRINGIFY(C)); C; }while(0)
+
   // Set up LEDs early
   #if HAS_COLOR_LEDS
-    leds.setup();
+    SETUP_RUN(leds.setup());
   #endif
 
-  ui.init();
+  SETUP_RUN(ui.init());
+
   #if HAS_SPI_LCD && ENABLED(SHOW_BOOTSCREEN)
-    ui.show_bootscreen();
+    SETUP_RUN(ui.show_bootscreen());
   #endif
 
-  ui.reset_status();        // Load welcome message early. (Retained if no errors exist.)
+  #if !HAS_SERVICE_INTERVALS
+    SETUP_RUN(ui.reset_status());     // Load welcome message early. (Retained if no errors exist.)
+  #endif
 
   #if ENABLED(SDSUPPORT)
-    card.mount();           // Mount the SD card before settings.first_load
+    SETUP_RUN(card.mount());          // Mount the SD card before settings.first_load
+  #endif
+
+  SETUP_RUN(settings.first_load());   // Load data from EEPROM if available (or use defaults)
+                                      // This also updates variables in the planner, elsewhere
+
+  #if HAS_SERVICE_INTERVALS
+    SETUP_RUN(ui.reset_status(true)); // Show service messages or keep current status
   #endif
-                            // Load data from EEPROM if available (or use defaults)
-  settings.first_load();    // This also updates variables in the planner, elsewhere
 
   #if ENABLED(TOUCH_BUTTONS)
-    touch.init();
+    SETUP_RUN(touch.init());
   #endif
 
-  #if HAS_M206_COMMAND      // Initialize current position based on home_offset
-    current_position += home_offset;
+  #if HAS_M206_COMMAND
+    current_position += home_offset;  // Init current position based on home_offset
   #endif
 
-  sync_plan_position();     // Vital to init stepper/planner equivalent for current_position
+  sync_plan_position();               // Vital to init stepper/planner equivalent for current_position
 
-  thermalManager.init();    // Initialize temperature loop
+  SETUP_RUN(thermalManager.init());   // Initialize temperature loop
 
-  print_job_timer.init();   // Initial setup of print job timer
+  SETUP_RUN(print_job_timer.init());  // Initial setup of print job timer
 
-  endstops.init();          // Init endstops and pullups
+  SETUP_RUN(endstops.init());         // Init endstops and pullups
 
-  stepper.init();           // Init stepper. This enables interrupts!
+  SETUP_RUN(stepper.init());          // Init stepper. This enables interrupts!
 
   #if HAS_SERVOS
-    servo_init();
+    SETUP_RUN(servo_init());
   #endif
 
   #if HAS_Z_SERVO_PROBE
-    probe.servo_probe_init();
+    SETUP_RUN(probe.servo_probe_init());
   #endif
 
   #if HAS_PHOTOGRAPH
   #endif
 
   #if HAS_CUTTER
-    cutter.init();
+    SETUP_RUN(cutter.init());
   #endif
 
   #if ENABLED(COOLANT_MIST)
   #endif
 
   #if HAS_BED_PROBE
-    endstops.enable_z_probe(false);
+    SETUP_RUN(endstops.enable_z_probe(false));
   #endif
 
   #if ENABLED(USE_CONTROLLER_FAN)
   #endif
 
   #if HAS_STEPPER_RESET
-    enableStepperDrivers();
+    SETUP_RUN(enableStepperDrivers());
   #endif
 
   #if ENABLED(DIGIPOT_I2C)
-    digipot_i2c_init();
+    SETUP_RUN(digipot_i2c_init());
   #endif
 
   #if ENABLED(DAC_STEPPER_CURRENT)
-    dac_init();
+    SETUP_RUN(dac_init());
   #endif
 
   #if EITHER(Z_PROBE_SLED, SOLENOID_PROBE) && HAS_SOLENOID_1
     #if DISABLED(CASE_LIGHT_USE_NEOPIXEL)
       if (PWM_PIN(CASE_LIGHT_PIN)) SET_PWM(CASE_LIGHT_PIN); else SET_OUTPUT(CASE_LIGHT_PIN);
     #endif
-    update_case_light();
+    SETUP_RUN(update_case_light());
   #endif
 
   #if ENABLED(MK2_MULTIPLEXER)
+    SETUP_LOG("MK2_MULTIPLEXER");
     SET_OUTPUT(E_MUX0_PIN);
     SET_OUTPUT(E_MUX1_PIN);
     SET_OUTPUT(E_MUX2_PIN);
   #endif
 
   #if HAS_FANMUX
-    fanmux_init();
+    SETUP_RUN(fanmux_init());
   #endif
 
   #if ENABLED(MIXING_EXTRUDER)
-    mixer.init();
+    SETUP_RUN(mixer.init());
   #endif
 
   #if ENABLED(BLTOUCH)
-    bltouch.init(/*set_voltage=*/true);
+    SETUP_RUN(bltouch.init(/*set_voltage=*/true));
   #endif
 
   #if ENABLED(I2C_POSITION_ENCODERS)
-    I2CPEM.init();
+    SETUP_RUN(I2CPEM.init());
   #endif
 
   #if ENABLED(EXPERIMENTAL_I2CBUS) && I2C_SLAVE_ADDRESS > 0
+    SETUP_LOG("i2c...");
     i2c.onReceive(i2c_on_receive);
     i2c.onRequest(i2c_on_request);
   #endif
 
   #if DO_SWITCH_EXTRUDER
-    move_extruder_servo(0);   // Initialize extruder servo
+    SETUP_RUN(move_extruder_servo(0));  // Initialize extruder servo
   #endif
 
   #if ENABLED(SWITCHING_NOZZLE)
+    SETUP_LOG("SWITCHING_NOZZLE");
     // Initialize nozzle servo(s)
     #if SWITCHING_NOZZLE_TWO_SERVOS
       lower_nozzle(0);
   #endif
 
   #if ENABLED(MAGNETIC_PARKING_EXTRUDER)
-    mpe_settings_init();
+    SETUP_RUN(mpe_settings_init());
   #endif
 
   #if ENABLED(PARKING_EXTRUDER)
-    pe_solenoid_init();
+    SETUP_RUN(pe_solenoid_init());
   #endif
 
   #if ENABLED(SWITCHING_TOOLHEAD)
   #endif
 
   #if ENABLED(ELECTROMAGNETIC_SWITCHING_TOOLHEAD)
-    est_init();
+    SETUP_RUN(est_init());
   #endif
 
   #if ENABLED(POWER_LOSS_RECOVERY)
-    recovery.check();
+    SETUP_RUN(recovery.check());
   #endif
 
   #if ENABLED(USE_WATCHDOG)
-    watchdog_init();          // Reinit watchdog after HAL_get_reset_source call
+    SETUP_RUN(watchdog_init());       // Reinit watchdog after HAL_get_reset_source call
   #endif
 
   #if ENABLED(EXTERNAL_CLOSED_LOOP_CONTROLLER)
-    init_closedloop();
+    SETUP_RUN(init_closedloop());
   #endif
 
   #ifdef STARTUP_COMMANDS
+    SETUP_LOG("STARTUP_COMMANDS");
     queue.inject_P(PSTR(STARTUP_COMMANDS));
   #endif
 
   #if ENABLED(INIT_SDCARD_ON_BOOT) && !HAS_SPI_LCD
-    card.beginautostart();
+    SETUP_RUN(card.beginautostart());
   #endif
 
   #if ENABLED(HOST_PROMPT_SUPPORT)
-    host_action_prompt_end();
+    SETUP_RUN(host_action_prompt_end());
   #endif
 
   #if HAS_TRINAMIC_CONFIG && DISABLED(PSU_DEFAULT_OFF)
-    test_tmc_connection(true, true, true, true);
+    SETUP_RUN(test_tmc_connection(true, true, true, true));
   #endif
 
   #if ENABLED(PRUSA_MMU2)
-    mmu2.init();
-  #endif
-
-  #if HAS_SERVICE_INTERVALS
-    ui.reset_status(true);  // Show service messages or keep current status
+    SETUP_RUN(mmu2.init());
   #endif
 
   #if ENABLED(MAX7219_DEBUG)
-    max7219.init();
+    SETUP_RUN(max7219.init());
   #endif
+
+  SETUP_LOG("setup() completed.");
 }
 
 /**