I'm not actually sure why you bother with this...
Clearly you haven't read the entire thread.
1: I have been programming in Pascal for almost 40-years.
2: I am retired so I have plenty of time on my hands.
3: I like free stuff and helping to make it work to thwart stupidly high software prices.
4: As Julius Summner Miller used to quote, "There is no crime in not knowing, it is
not wanting to know that is the crime."
The C/C++ offered by Arduino software is much more easier to learn than configure FPC/Lazarus properly in order to make workable .hex file from this experimental attempt to support AVRs.
Obviously you have already managed this with Lazarus otherwise how would you know how long it takes to achieve success?
Please share your experiences and save us all this fun.
Besides, the Lazarus part is now working at least for the Uno which is a mile ahead of where it was when this process started.
Dare I suggest a conflict of interests in getting a FREE working Pascal version of the Arduiono compiler?

Experimentation is how things are done in the real world.
If everyone adhered to
only what was available you would still be clubbing a buffalo to death for meat.
board (actually ATmega2560 itself) can be blocked refusing further communication with avrdude
And, I will cry myself to sleep each night for a week over that $5 loss.
If you want to use Pascal anyway, you may start with Mikroelektronika's AVR Pascal compiler.
Hmmm, let me think about that one. Lazarus cost $0.00, your software cost $250.00.
At least we know it can be done and there is no greater impetus for experimenters than an existing example of an expensive something to replicate.