problems with Flash by redboot on eCos with NIOS2

Thank you a lot for the advice, this was something i didnt know yet

So, I just tried out the compiler switches with my test program and

-mbypass-cache and -mno-cache-volatile made the pointer operations work like io-instructions. For unknown reason, -mno-bypass-cache did not success.

But within my test-program, it works.

But when adding this options to compiler options for building redboot, * i was really wondering * it did not work... http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/sad.gif

I tried to modify the flash_driver function flash_query(void* data) to make sure and replaced all direct io operations... i thought, this should work for sure, but i don&#39;t know why the hell, but it doesn&#39;t http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/mad.gif

...
// Marek: made some helper macros# if (_16AS8 == 0)# define FIO_WR(ADDR, DATA) HAL_WRITE_UINT8(CYGNUM_FLASH_BASE + ADDR, DATA)# define FIO_RD(ADDR, VALUE) HAL_READ_UINT8(CYGNUM_FLASH_BASE + ADDR, VALUE)# else# define FIO_WR(ADDR, DATA) HAL_WRITE_UINT16(CYGNUM_FLASH_BASE + ADDR, DATA)# define FIO_RD(ADDR, VALUE) HAL_READ_UINT16(CYGNUM_FLASH_BASE + ADDR, VALUE)# endif
# define FIO_S1_WR( DATA ) FIO_WR( FLASH_Setup_Addr1 , DATA)# define FIO_S2_WR( DATA ) FIO_WR( FLASH_Setup_Addr2 , DATA)
...
void
flash_query(void* data)
{
    //volatile flash_data_t *ROM;
    //volatile flash_data_t *f_s1, *f_s2;
    flash_data_t* id = (flash_data_t*) data;
    flash_data_t w,w2;
    long timeout = CYGNUM_FLASH_TIMEOUT_QUERY;
    
    //ROM = (flash_data_t*) CYGNUM_FLASH_BASE;
    //f_s1 = FLASH_P2V(ROM+FLASH_Setup_Addr1);
    //f_s2 = FLASH_P2V(ROM+FLASH_Setup_Addr2);
    
    // *f_s1 = FLASH_Reset;
    FIO_S1_WR(FLASH_Reset);
//    w = *(FLASH_P2V(ROM));
    FIO_RD(0, w);
    // *f_s1 = FLASH_Setup_Code1;
    FIO_S1_WR(FLASH_Setup_Code1);
    // *f_s2 = FLASH_Setup_Code2;
    FIO_S2_WR(FLASH_Setup_Code2);
    // *f_s1 = FLASH_Read_ID;
    FIO_S1_WR(FLASH_Read_ID);
    
    id = -1;
    id = -1;
    // Manufacturers' code
    // id = *(FLASH_P2V(ROM+FLASH_VendorID_Addr));
    FIO_RD(FLASH_VendorID_Addr, id);
    // Part number
    // id = *(FLASH_P2V(ROM+FLASH_DeviceID_Addr));
    FIO_RD(FLASH_DeviceID_Addr, id);
//    id = *(FLASH_P2V(ROM+FLASH_DeviceID_Addr2));
    FIO_RD(FLASH_DeviceID_Addr2, id);
//    id = *(FLASH_P2V(ROM+FLASH_DeviceID_Addr3));
    FIO_RD(FLASH_DeviceID_Addr3, id);
    // *(FLASH_P2V(ROM)) = FLASH_Reset;
    FIO_WR(0, FLASH_Reset);
    // Stall, waiting for flash to return to read mode.
    FIO_RD(0,w2);
    while ((--timeout != 0) && (w !=  w2/* *(FLASH_P2V(ROM))*/)) 
    {
  FIO_RD(0,w2);
    };
}

Did I something wrong?? The nearly same code works in my testing program ...

Note:

I put a look into the source of ecos 2.01 and found that someone already tried to fix that problem by using hal_dcache_xxxx in a function that wrapp&#39;s flash_query. But this depends on that the prozessor is able to switch dcache&#39;ing on/off, which the NIOS prozessor isn&#39;t able to. So these Macros actually do nothing when build for NIOS.

void
flash_query(void* data)
{
    int cache_on;
    HAL_DCACHE_IS_ENABLED(cache_on);
    if (cache_on) {
        HAL_DCACHE_SYNC();
        HAL_DCACHE_DISABLE();
    }
    _flash_query(data);
    if (cache_on) {
        HAL_DCACHE_ENABLE();
    }
}

I currently give up trying to build redboot and wonder, if

all people have such problems, when trying nios with redboot or if i&#39;m just an anomalie...

Regards,

Marek

PS: Sorry for posting much code, i hope it helps more than ti does struggeling you