[ECOS] Scheduler Problem

["James Yates" <j dot yates at quartzuk dot com>]

I have just ported eCos to my own custom SH2 platform and I am now at the point of  getting a simple app up and running. I have a bootloader running on my board which copies the executable from flash to RAM, sets the CPU VBR to the correct location and jumps to the address held in the first entry of the table.
My app starts in cyg_user_start where I can print some diagnostic out of the serial port. I am infact using the example app code from the "Embedded Software Development with eCos" book. This creates 2 threads, sets them to resume when the scheduler then exits cyq_user_start where as I understand it, the scheduler is then started. 
After a couple of seconds, a load of rubbish is printed out of the serial portand then nothing else. It would appear that the first thread is starting and something is going horribly wrong but I am not sure what.

   Has anyone had any similar problems in this area or can offer any suggestions?

Example code below:

void thread_a( cyg_addrword_t data )
{
	// Store the data value passed in for this thread.
	int msg = (int)data;

	diag_printf("Thread A Start\n" );

	while( 1 )
	{
		// Increment the thread a count.
		thread_a_count++;

		// Send out a message to the diagnostic port.
		diag_printf( "Thread A, count: %d  message: %d\n", thread_a_count, msg );

		// Delay for 1 second.
		cyg_thread_delay( 100 );

		// Signal thread B using the semaphore.
		cyg_semaphore_post( &sem_signal_thread );
	}
}

void thread_b( cyg_addrword_t data )
{
	// Store the data value passed in for this thread.
	int msg = (int)data;

	diag_printf("Thread B Start\n" );

	while( 1 )
	{
		// Signal thread B using the semaphore.
		cyg_semaphore_wait( &sem_signal_thread );

		// Send out a message to the diagnostic port.
		diag_printf( "Thread B, message: %d\n", msg );
	}
}

void cyg_user_start( void )
{
	// Initialize the count for thread a.
	thread_a_count = 0;

	// It wouldn't be much of a basic example if some
	// kind of hello message wasn't output.
	diag_printf( "Hello eCos World!!!\n" );

	// Initialize the semaphore with a count of zero,
	// prior to creating the threads.
	cyg_semaphore_init( &sem_signal_thread, 0 );

	diag_printf( "Point 2\n" );

	//
	// Create our two threads.
	//
	cyg_thread_create(
			THREAD_PRIORITY,
			thread_a,
			(cyg_addrword_t) 75,
			"Thread A",
			(void *)thread_a_stack,
			THREAD_STACK_SIZE,
		    &thread_a_hdl,
		    &thread_a_obj );

	cyg_thread_create(
			THREAD_PRIORITY,
			thread_b,
			(cyg_addrword_t) 68,
			"Thread B",
			(void *)thread_b_stack,
			THREAD_STACK_SIZE,
		    &thread_b_hdl,
		    &thread_b_obj );

	// Resume the threads so they start when the scheduler
	// begins.
 	diag_printf( "Point 3\n" );
	cyg_thread_resume( thread_a_hdl );
	cyg_thread_resume( thread_b_hdl );

 	diag_printf( "Point 4\n" );

} 

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