Does the latest IDE support 644P and 1284P?

Other Hardware 3rd Party Boards

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Mighty-1284P core updated for Arduino 1.0.6 3rd Party Boards	83	31469	May 6, 2021
Arduino Mega vs Sanguino (Why not adopt Sanguino?) Development	24	8746	May 6, 2021
ATmega644(Sanguino) compatibility on Arduino 0012 Frequently-Asked Questions	20	9684	May 6, 2021
'1284P & 1.0.3 Programming	7	2999	May 5, 2021
ATmega1284P: End to End using 1.0 IDE 3rd Party Boards	593	230209	May 6, 2021