A STK500v1 compatible serial bootloader for classic AVR controllers (atmega328p and similar), written in Pascal.

By default the bootloader supports the stk500v1, avrisp and arduino programmer types of avrdude. This supports many of the commands according to document AVR061. By setting a compile time definition arduino, a smaller subset of AVR061 commands are supported, similar to the optiboot project. This results in a smaller bootloader. This mode only supports the avrdude programmer type arduino.

Tested on atmega328p and atmega2560, but should in principle be compatible with any controller with a subarch of avr4, avr5, avr51 or avr6.

This is a PC project which simulates the bootloader behaviour. The main purpose is to aid in debugging protocol related logic. To test this, one needs to create a pair of virtual serial ports through which avrdude can interact. On Linux, the command socat -d -d pty,link=/tmp/vserial1,raw,echo=0 pty,link=/tmp/vserial2,raw,echo=0 can be used to create this. On Windows, a tools such as com0com could be used.