Tips to run EEE Driver with freeRTOS in MPC5746C

[hangxie]

We had port freeRTOS v8.2.3 to MPC5746C, but when I porting the EEPROM emulation driver, I found that need to disable the D-Cache (define the macro "DCACHE_AVAILABLE" ) when exec "FSL_WriteEeprom" and "FSL_MainFunction", If not define the DCACHE_AVAILABLE macro, the swapping will failure, But after I disable the D-Cache, the freeRTOS may run unsteadiness or trig Machine Check Exception.

(Similar to this post Disable Dcache of 5744 will make CCP unsteadiness )

Finally, I  set the EEPROM area （0xF90000 ~ 0x00F9FFFF） "cache inhibit" in the SMPU, and undefine the macro "DCACHE_AVAILABLE", then both the EEE Driver and freeRTOS work fine.

[hangxie]

By the way, I create a test task to R/W the EEE，after 10K cycle, it still works fine:

    for( ;; )
    {

#if DRV_DEBUG_ENABLE_SWT == 1
      drv_cpu_feeddog();
#endif
      /* Not very exiting - just delay... */
      vTaskDelay( 25 );

      drv_eee_readData(0x66,24,TmpBuf2);
      LOG("R1:%3d\r\n",TmpBuf2[0]);
      TmpBuf2[0] += 1;
      drv_eee_writeData(0x77,24,TmpBuf2);

      /* delay */
      vTaskDelay( 25 );

      drv_eee_readData(0x77,24,TmpBuf1);
      LOG("R2:%3d\r\n",TmpBuf1[0]);
      TmpBuf1[0] += 1;
      drv_eee_writeData(0x66,24,TmpBuf1);

    }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍