Mega2560 bootloader - various bugfixes

[cmaglie]

Patches to Mega2560 stk500v2 bootloader from Mark Sproul, to be tested.

See #181 #392 #505 #543 #544

[bkubicek]

please merge, finally the watchdog reset might work on an arduino mega 2560....

[cmaglie]

Please check the fix, and report if it works.
Any report will speed up the merge.

C

[cmaglie]

The updated hex file is available here:

https://github.com/cmaglie/Arduino/blob/mega2560-bootloader/hardware/arduino/bootloaders/stk500v2/stk500boot_v2_mega2560.hex

[n0rad]

I can confirm that this bootloader allow upload of the eeprom on a 2560.

I'm working on a restful client/server that store board settings in eeprom : https://github.com/housecream/restmcu.

[n0rad]

It seems that data are not well written to the eeprom on latests bytes :

avrdude: reading input file "target/restmcu.eep"
avrdude: input file target/restmcu.eep auto detected as Intel Hex
avrdude: writing eeprom (433 bytes):

Writing | ################################################## | 100% 1.79s

avrdude: 433 bytes of eeprom written
avrdude: verifying eeprom memory against target/restmcu.eep:
avrdude: load data eeprom data from input file target/restmcu.eep:
avrdude: input file target/restmcu.eep auto detected as Intel Hex
avrdude: input file target/restmcu.eep contains 433 bytes
avrdude: reading on-chip eeprom data:

Reading | ################################################## | 100% 0.05s

avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x01b0
0x00 != 0xff
avrdude: verification error; content mismatch

[cmaglie]

@n0rad
I cannot reproduce your issue, just tested write and read of the eeprom. Can you provide your command line and .hex file?
C

[n0rad]

avrdude -C /etc/avrdude.conf -p atmega2560 -P /dev/ttyACM0 -c stk500v2 -b 115200 -D -U flash:w:n0rad2560.hex -U eeprom:w:n0rad2560.eep

https://raw.github.com/housecream/restmcu/master/board/n0rad2560.eep
https://raw.github.com/housecream/restmcu/master/board/n0rad2560.hex

[cmaglie]

@n0rad
It was a wrong addressing of EEPROM. Would you try the fix?

the updated bootloader:

https://raw.github.com/cmaglie/Arduino/8fa7d94a45b58696cd828f6a637f9da3b5404180/hardware/arduino/bootloaders/stk500v2/stk500boot_v2_mega2560.hex

[syrinx75]

Is it normal to get this error? I use an Arduino UNO as ISP.

avrdude: verification error, first mismatch at byte 0x1e000
0xff != 0x0d
avrdude: verification error; content mismatch

[cmaglie]

@syrinx75
I don't understand what are you trying to do, are you using the Arduino UNO (as ISP) to burn the bootloader into the Mega2560 (through the ICSP connector)?

[syrinx75]

Yes, I use an Arduino UNO as ISP with this wiring: https://www.sparkfun.com/tutorial/ArduinoBootloader/BootloadArduino1.jpg
to burn the bootloader of the 2560 with ArduioIDE 1.03

[lestofante]

Use this guide:
http://www.michelemenniti.it/arduino_burn_bootloader.phpis in Italian
but image are universal, also a hood tramslator can help
Il giorno 09/mar/2013 18:41, "syrinx75" [email protected] ha
scritto:

Yes, I use an Arduino UNO as ISP with this wiring:
https://www.sparkfun.com/tutorial/ArduinoBootloader/BootloadArduino1.jpg
to burn the bootloader of the 2560 with ArduioIDE 1.03

—
Reply to this email directly or view it on GitHubhttps://github.com//pull/1183#issuecomment-14667106
.

[n0rad]

The eeprom is well written with the new version

[cmaglie]

Merged.

[gokuhs]

My atmega2560 now works perfetly with the cmaglie's hex ( #1183 (comment) ),

To program it, I follow this tutorial and I program it with a Arduino Uno : https://www.sparkfun.com/tutorials/247

Tip: the command i use:
$ avrdude -P /dev/ttyACM0 -b 19200 -c avrisp -p atmega2560 -v -e -U flash:w:stk500boot_v2_mega2560.hex -U lock:w:oxoF:m