## Configure flash parameters (for ESP12-E and other new boards):
SPI_MODE = dio
## SPIFFS options
DISABLE_SPIFFS = 1
# SPIFF_FILES = files
If I were to use the old Makefile in v1.4 and use it in v2.1, the compiled binary does not work properly. What changes were made in v2.1 that makes these 2 entries necessary in the Makefile?