For now, I'm using an Arduino Uno alone including its 328p (no other external chip to program).

I would like to change its fuses to internal 8 Mhz clock (because then I'll move the 328p out of the Arduino Uno), and for simplicity I'd like to do it from Arduino IDE.

Here is what I tried:

• I created a new entry in boards.txt copy-pasted from Uno, fuses modified, like this:

    atmega328p.name=Atmega328p
    atmega328p.upload.tool=avrdude
    atmega328p.upload.protocol=arduino
    atmega328p.upload.maximum_size=32256
    atmega328p.upload.maximum_data_size=2048
    atmega328p.upload.speed=115200
  
    atmega328p.bootloader.tool=avrdude
    atmega328p.bootloader.low_fuses=0x62
    atmega328p.bootloader.high_fuses=0xD9
    atmega328p.bootloader.extended_fuses=0xFF
    atmega328p.bootloader.unlock_bits=0x3F
    atmega328p.bootloader.lock_bits=0x0F
    atmega328p.bootloader.file=optiboot/optiboot_atmega328.hex
  
    atmega328p.build.mcu=atmega328p
    atmega328p.build.f_cpu=8000000L
    atmega328p.build.board=AVR_UNO
    atmega328p.build.core=arduino
    atmega328p.build.variant=standard
  

• I tried to Upload any sketch (and not Upload with programmer since I have no other chip connected to the Arduino Uno), hoping it would modify the fuses.

I think it didn't work (when I move the 328p outside of the Uno it doesn't work).

How can I change the fuses for an Arduino Uno directly from Arduino IDE, to enable internal 8 Mhz clock?

For now, I'm using an Arduino Uno alone including its 328p (no other external chip to program).

I would like to change its fuses to internal 8 Mhz clock (because then I'll move the 328p out of the Arduino Uno), and for simplicity I'd like to do it from Arduino IDE.

Here is what I tried:

• I created a new entry in boards.txt copy-pasted from Uno, fuses modified, like this:

    atmega328p.name=Atmega328p
    atmega328p.upload.tool=avrdude
    atmega328p.upload.protocol=arduino
    atmega328p.upload.maximum_size=32256
    atmega328p.upload.maximum_data_size=2048
    atmega328p.upload.speed=115200
  
    atmega328p.bootloader.tool=avrdude
    atmega328p.bootloader.low_fuses=0x62
    atmega328p.bootloader.high_fuses=0xD9
    atmega328p.bootloader.extended_fuses=0xFF
    atmega328p.bootloader.unlock_bits=0x3F
    atmega328p.bootloader.lock_bits=0x0F
    atmega328p.bootloader.file=optiboot/optiboot_atmega328.hex
  
    atmega328p.build.mcu=atmega328p
    atmega328p.build.f_cpu=8000000L
    atmega328p.build.board=AVR_UNO
    atmega328p.build.core=arduino
    atmega328p.build.variant=standard
  

• I selected this board in Tools > Board: Atmega328p

• I tried to Upload any sketch (and not Upload with programmer since I have no other chip connected to the Arduino Uno), hoping it would modify the fuses during the (successful) Upload process.

I think it didn't work (when I move the 328p outside of the Uno it doesn't work).

How can I change the fuses for an Arduino Uno directly from Arduino IDE, to enable internal 8 Mhz clock?

PS: "Tools > Burn Bootloader" does not succeed, but I think this is normal, since there is just the Arduino Uno, and no other chip / nothing to use as a "Programmer":

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x03