XMEGA Flash memory access through ChipWhisperer Lite PDI interface

I’m trying to prepare a direct memory access to XMEGA D4 Flash memory in Chip Whisperer Lite XMEGA DUT. But I don’t understand, why in “programmer_xmega.py” source file, flash offset set up to 0x800000 and has size equal 0x22000! It’s remap from XMEGA memory to FPGA buffer through PDI interface??? And if so, “application table flash section” for XMEGA 128D4 DUT mapped to 0x800000 + 0xF000 (according to datasheet)? Thanks for help!