[U-Boot-Users] strange problem on lib_mips/board.c

[zhuzhenhua]

i am porting u-boot on our board, and in function board_init_f of board.c
i remove the line
 	__asm__ __volatile__("": : :"memory");
and change the
init_fnc_t *init_sequence[] = {
	timer_init,
	env_init,		/* initialize environment */
#ifdef CONFIG_INCA_IP
	incaip_set_cpuclk,	/* set cpu clock according to environment variable */
#endif
	init_baudrate,		/* initialze baudrate settings */
	serial_init,		/* serial communications setup */
	console_init_f,
	display_banner,		/* say that we are here */
	checkboard,
	init_func_ram,
	NULL,
};
to
init_fnc_t *init_sequence[] = {
	timer_init,
//	env_init,		/* initialize environment */
#ifdef CONFIG_INCA_IP
	incaip_set_cpuclk,	/* set cpu clock according to environment variable */
#endif
//	init_baudrate,		/* initialze baudrate settings */
	serial_init,		/* serial communications setup */
	env_init,	
	init_baudrate,		
	console_init_f,
	display_banner,		/* say that we are here */
	checkboard,
	init_func_ram,
	NULL,
};

and it will output string on uart and it can finish the init_fnc_t
*init_sequence[]  correctly,
but if i do not remove the "__asm__.." line or not change the
init_sequence, it will get nothing output on uart.

can someone give some possible reason for this situation?

thanks!