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docs: Add some notes to Bootloaders.md on using the atmega168 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2018-08-27 12:05:48 -04:00
parent 0bce44e1bb
commit a5189f7c25
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docs/Bootloaders.md
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@ -121,6 +121,25 @@ application with it using something like:
teensy_loader_cli --mcu=at90usb1286 out/klipper.elf.hex -v
```
## Atmega168 ##
The atmega168 has limited flash space. If using a bootloader, it is
recommended to use the Optiboot bootloader. To flash that bootloader
use something like:
```
wget 'https://github.com/arduino/Arduino/raw/1.8.5/hardware/arduino/avr/bootloaders/optiboot/optiboot_atmega168.hex'
avrdude -cavrispv2 -patmega168 -P/dev/ttyACM0 -b115200 -e -u -U lock:w:0x3F:m -U efuse:w:0x04:m -U hfuse:w:0xDD:m
avrdude -cavrispv2 -patmega168 -P/dev/ttyACM0 -b115200 -U flash:w:optiboot_atmega168.hex
avrdude -cavrispv2 -patmega168 -P/dev/ttyACM0 -b115200 -U lock:w:0x0F:m
```
To flash an application via the Optiboot bootloader use something
like:
```
avrdude -carduino -patmega168 -P/dev/ttyACM0 -b115200 -D -Uflash:w:out/klipper.elf.hex:i
```
SAM3 micro-controllers (Arduino Due)
====================================