Flash leveling for some STM32 boards (and more later?)#16174

Merged

thinkyhead merged 4 commits intoMarlinFirmware:bugfix-2.0.xfrom randellhodges:stm32f4_flashleveling

Dec 22, 2019

+268-24

Commits on Dec 11, 2019

draft changes for flash eeprom leveling with F407 and F446 boards
randellhodges
committed
Update persistent_store_flash.cpp

thinkyhead
authored and
randellhodges
committed

Commits on Dec 13, 2019

Changes to minimize flash data writes, expands to all STM32F4 chips
randellhodges
committed

Commits on Dec 19, 2019

Fix a typo or two
thinkyhead
committed