marlinfw/buildroot/share/PlatformIO/scripts/marlin.py

#
# buildroot/share/PlatformIO/scripts/marlin.py
# Helper module with some commonly-used functions
#
from SCons.Script import DefaultEnvironment
env = DefaultEnvironment()

def replace_define(field, value):
    envdefs = env['CPPDEFINES'].copy()
    for define in envdefs:
        if define[0] == field:
            env['CPPDEFINES'].remove(define)
    env['CPPDEFINES'].append((field, value))

# Relocate the firmware to a new address, such as "0x08005000"
def relocate_firmware(address):
    replace_define("VECT_TAB_ADDR", address)