读写FLASH的问题

FLASH

我在程序中读写flash,用debug模式可以正确读写flash,当把程序烧入到flash中,然后启动这段程序,运行结过就是读写flash出错,请问这是什么问题?

有谁遇到吗?

我的读写flash的代码如下:

#include <stdio.h>
#include <sys/alt_flash.h>
#include "system.h"

#define DATA_OFFSET 0x300000

void main(void)
{
alt_flash_fd* flash_handle;
FILE *uart;

char write_data = 0;
char read_data = 0;

write_data = 100;

uart = fopen(UART_0_NAME,"w");
flash_handle = alt_flash_open_dev(CFI_FLASH_0_NAME);
      fprintf(uart, "open flash device...\n");
      usleep(10000);

if (flash_handle)
{
    fprintf(uart, "open flash device successed!!!\n");
      usleep(10000);
    alt_write_flash(flash_handle, DATA_OFFSET, &write_data, 1);
      fprintf(uart, "wirte_data = %d\n", write_data);
      usleep(10000);
    alt_read_flash(flash_handle, DATA_OFFSET, &read_data, 1);
      fprintf(uart, "read_data = %d\n", read_data);
      usleep(10000);

    if(read_data == write_data)
    {
      fprintf(uart, "flash write and read successed!!!\n");
      usleep(10000);
    }
    else
    {
      fprintf(uart, "flash write or read failed!!!\n");
      usleep(10000);
    }
    alt_flash_close_dev(flash_handle);
      fprintf(uart, "close flash device...\n");
      usleep(10000);
}
else
{
    fprintf(uart, "open flash device failed!!!\n");
      usleep(10000);
}
}