bsps/i386/pc386: Delay with the 8254

Wait_X_ms() spun in a loop which bsp_start() calibrated against the
8254.  The calibration abandoned the measurement after five attempts
and then spun forever, which stopped the boot of every executable.  A
simulator which derives its clock from the executed instructions
reaches that point.

Take the delay from channel 2 of the 8254, which software gates and
which drives no interrupt, so the tick source on channel 0 stays
untouched.  The counter is 16 bits wide, so the delay takes one
millisecond at a time.  Delete the calibration together with its call
in bsp_start().

Close #5728.

Assisted-by: Claude:claude-opus-5 claude-code
Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

bsps/i386/pc386/include/bsp.h

@@ -177,7 +177,6 @@ int           getch( void );             /* from 'inch.c' */
 void           add_to_queue( unsigned short b ); /* from 'inch.c' */
 
 void Wait_X_ms(unsigned int timeToWait); /* from 'timer.c'  */
-void Calibrate_loop_1ms(void);           /* from 'timer.c'  */
 
 void rtems_irq_mngt_init(void);          /* from 'irq_init.c' */
 

bsps/i386/pc386/start/bspstart.c

@@ -77,14 +77,6 @@ static void bsp_pci_initialize_helper(void)
 +--------------------------------------------------------------------------*/
 static void bsp_start_default( void )
 {
-  /*
-   * Turn off watchdog
-   */
-  /*
-   * Calibrate variable for 1ms-loop (see timer.c)
-   */
-  Calibrate_loop_1ms();
-
   /*
    * Init rtems interrupt management
    */