CCS/TMS320F280021: TMS320F280021

Tool/software: Code Composer Studio

Hi, I have down load C2000Ware_3_01_00_00 from TI web to learn TI's DSP programing. and in the example named "gpio_ex2_toggle", there was some codes in file "device.c" I could not fully understand.

#ifdef _FLASH
    //
    // Copy time critical code and flash setup code to RAM. This includes the
    // following functions: InitFlash();
    //
    // The RamfuncsLoadStart, RamfuncsLoadSize, and RamfuncsRunStart symbols
    // are created by the linker. Refer to the device .cmd file.
    //
    memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
 
    //
    // Call Flash Initialization to setup flash waitstates. This function must
    // reside in RAM.
    //
    Flash_initModule(FLASH0CTRL_BASE, FLASH0ECC_BASE, DEVICE_FLASH_WAITSTATES);
#endif

where is _FLASH?

thank you very much!