.rwdata

Are you using nios 1.0 ? This is what I am struggling with now, I found that in order to get my internal ROM code to operate I needed to initialise some variables myself, so it involves inspecting driver code/etc to see if anything needs setup.

An example to get up-and-running with only the timer interrupt taken care of is.

alt_main.c:

# include <stdio.h># include <stdlib.h># include "system.h"# include "sys/alt_sys_init.h"# include "sys/alt_irq.h"# include "sys/alt_alarm.h"

extern void* altera_avalon_timer_ts_base;

extern alt_u32 altera_avalon_timer_ts_freq;

extern alt_u32 alt_priority_mask;

extern alt_u32 alt_irq_active;

extern alt_u32 _alt_tick_rate;

extern volatile alt_u32 _alt_nticks;

extern alt_llist alt_alarm_list;

void alt_main(void)

{

altera_avalon_timer_ts_base = (void*) 0;

altera_avalon_timer_ts_freq = 0;

alt_priority_mask = (alt_u32) -1;

alt_irq_active = 0;

_alt_tick_rate = 0;

_alt_nticks = 0;

alt_alarm_list.next = &alt_alarm_list;

alt_alarm_list.previous = &alt_alarm_list;

alt_irq_init (ALT_IRQ_BASE);

alt_sys_init();

main();

for(;;)

;

}