Change of EEPROM address for update check

[aviatorhh]

I have changed the CS pin in asmfunc.S to get it running on the Ethernet Shield 2 where the CS pin for the SD access is 4 (PG5). I am happy about your work and the update process is functioning.
The EEPROM address seems to be hardcoded in stk500boot.c:1147.

    if(boot_state == 2){
        if(eeprom_read_byte(0x1FF) == 0xF0){
           pf_mount(&Fatfs);	/* Initialize file system */
           if(pf_open("firmware.bin") == FR_OK){
               DWORD fa;	/* Flash address */
               WORD br;	/* Bytes read */
               uint8_t i = 0;
               sendchar(0x0d);
               sendchar(0x0a);
               for (fa = 0; fa < 0x3E000; fa += SPM_PAGESIZE) {	/* Update all application pages */
                   PROGLED_PORT	^=	(1<<PROGLED_PIN);	// turn LED ON
                   delay_ms(50);
                   flash_erase(fa);					/* Erase a page */
                   memset(Buff, 0xFF, SPM_PAGESIZE);	/* Clear buffer */
                   pf_read(Buff, SPM_PAGESIZE, &br);	/* Load a page data */
                   if(br) flash_write(fa, Buff);		/* Write it if the data is available */
                }
               sendchar(0x0d);
               sendchar(0x0a);
               check = 0;
               eeprom_write_byte (0x1FF, 0xFF);

Suggest to use a #define for better control. Or is the EEPROM erased anyway?

[Mesger1]

stk500boot.c needs to be compiled and loaded as bootloader into your atmega2560. This way you can adjust to your liking. There is a short discription on how to compile.

[aviatorhh]

I did already (see CS pin change), but I just wanted to point out the (easy) change of the EEPROM address as there sometimes is data in the EE.
Thank you