AirBootGSM/optiboot.h at master · shadlyd15/AirBootGSM · GitHub

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#ifndef optiboot_h
#define optiboot_h

#if defined(__AVR_ATmega168__)
	#define RAMSTART (0x100)
	#define NRWWSTART (0x3800)
#elif defined(__AVR_ATmega328P__)
	#define RAMSTART (0x100)
	#define NRWWSTART (0x7000)
#elif defined (__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__)
	#define RAMSTART (0x100)
	#define NRWWSTART (0xE000)
#elif defined(__AVR_ATtiny84__)
	#define RAMSTART (0x100)
	#define NRWWSTART (0x0000)
#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
//	#define RAMSTART (0x200)
	#define NRWWSTART (0xE000)
#elif defined(__AVR_ATmega8__) || defined(__AVR_ATmega88__)
	#define RAMSTART (0x100)
	#define NRWWSTART (0x1800)
#endif

/* This kind of define'd pointer to memory cause
 * the bootloader to hang during flashing
 * so it has been replaced with an uint8_t array of size 256
 * inside the programming phase
 */
//#define buff    ((uint8_t*)(RAMSTART))

/* C zero initialises all global variables. However, that requires
 * These definitions are NOT zero initialised, but that doesn't matter
 * This allows us to drop the zero init code, saving us memory
 */
#ifdef VIRTUAL_BOOT_PARTITION
#define rstVect (*(uint16_t*)(RAMSTART+SPM_PAGESIZE*2+4))
#define wdtVect (*(uint16_t*)(RAMSTART+SPM_PAGESIZE*2+6))
#endif

/*
 * Jump into the serial flashing subsystem
 */
uint8_t processOptiboot(void);

#endif