Remote update Flash EPROM (EPCS16) using lan/ uart

It is not so simple how you write or i have some error on my design or program. I have design, where i have altremote_update0 megafunction connect to NIOS2/f to LED_BASE led[15] to reconfig pin and led[14] to reset pin and i have this part of program:

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printf("Restart altremote_update.\n");

IOWR_ALTERA_AVALON_PIO_DATA(LED_BASE,0x4000);

usleep(10000);

IOWR_ALTERA_AVALON_PIO_DATA(LED_BASE,0x0);

// open flash

printf("Oteviram flash EPROM.\n");

fd = alt_flash_open_dev("/dev/epcs_flash_controller_0");

if (fd!=NULL)

{

printf("Info flash EPROM.\n");

ret_code = alt_get_flash_info(fd, &regions, &number_of_regions);

if (!ret_code)

{

printf("Flash EPROM obsahuje %d sektoru.\n", regions->number_of_blocks);

for(n=0;n<regions->number_of_blocks;n++)

{ printf("Erase %d.sector.\n",n);

if (fd!=NULL) alt_erase_flash_block(fd, n*65536, 65536);

}

printf("Wait on data in UART.\n");

}

}

init_uarts();

// main cycle

while (1)

{

// write uarts data to flash eprom

if (rx_lan_flag1==1)

{ alt_printf("%x ",blok_cnt);

// reverzuj bity

ReverseBitsInBytes(data_written, 256);

// write block

if (fd!=NULL) ret_code = alt_write_flash_block(fd, 0, blok_cnt*256, data_written, 256);

rx_lan1=0;

rx_lan_flag1=0;

blok_cnt++;

}

// read data

if (blok_cnt==16*256)

{ printf("Reading flash EPROM.\n");

for(m=0;m<blok_cnt;m++)

{ ret_code = alt_read_flash(fd, m*256, data_read, 256);

// reverzuj bity

ReverseBitsInBytes(data_read, 256);

// list only 16 bytes from 256-bytes block

printf("%04X:",m);

for(n=0;n<16;n++)

{ printf("%02X",data_read[n]);

}

printf("\n");

}

printf("Close flash EPROM.\n");

alt_flash_close_dev(fd);

blok_cnt=0;

printf("Perform reconfiguration - write 1 to config.pin.\n");

IOWR_ALTERA_AVALON_PIO_DATA(LED_BASE,0x8000);

usleep(10000);

IOWR_ALTERA_AVALON_PIO_DATA(LED_BASE,0x0);

}

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Everything is ok, but reconfiguration does not start after

IOWR_ALTERA_AVALON_PIO_DATA(LED_BASE,0x8000);

usleep(10000);

IOWR_ALTERA_AVALON_PIO_DATA(LED_BASE,0x0);

When i turn off and turn on power supply of the board, it takes the bitstream which i programed to flash and it work well.

Is possible to set some registers on altremote megafunction or something else ?

Clock for NIOS is 120MHz and for altremote megafunction 20MHz. In NIOS is not any timer ...

Thank you for your answer.

Jan