rem: static void __card_dounmount(u32 chn,s32 result)
add: static void __card_dounmount(s32 chn,s32 result)
context: static void __card_dounmount(u32 chn,s32 result){	u32 level;	card_block *card;	if(chn<EXI_CHANNEL_0 || chn>=EXI_CHANNEL_2) return;	card = &cardmap[chn];	_CPU_ISR_Disable(level);	if(card->attached) {		card->attached = 0;		card->mount_step = 0;		card->result = result;		EXI_RegisterEXICallback(chn,NULL);		EXI_Detach(chn);		SYS_CancelAlarm(&card->timeout_svc);	}	_CPU_ISR_Restore(level);}