The latest (f1e6a72) commit seems broken for me... Looks like uploaded code does not start. After reboot standard text at 74480bps displayed, ends with "main.c" and neither Serial nor digitalWrite don't work.

The total sketch size is 19kb bigger comparing to old (pre str_tok fix) commit (257308 vs 230776 bytes

The full erase (write blank512k) does not solves issue