-# Formulas used to calculate the starting address of the Bootloader section, and the User Application
-# API jump table (for more information on the latter, see the bootloader documentation). These formulas
-# should not need to be altered - modify the FLASH_SIZE_KB and BOOT_SECTION_KB values above instead.
-BOOT_START = 0x$(shell echo "obase=16; ($(FLASH_SIZE_KB) - $(BOOT_SECTION_SIZE_KB)) * 1024" | bc)
-BOOT_API_TABLESTART = 0x$(shell echo "obase=16; (($(FLASH_SIZE_KB) * 1024) - 96)" | bc)
+# Bootloader address calculations (requires the "bc" unix utility) and
+# API section start directives - do not modify these macros, but rather
+# modify the depedant values above.
+BOOT_START := 0x$(shell echo "obase=16; ($(FLASH_SIZE_KB) - $(BOOT_SECTION_SIZE_KB)) * 1024" | bc)
+BOOT_SEC_OFFSET = 0x$(shell echo "obase=16; (($(FLASH_SIZE_KB) * 1024) - $(strip $(1)))" | bc)
+BOOT_SECTION_LD_FLAG = -Wl,--section-start=.apitable_$(strip $(1))=$(call BOOT_SEC_OFFSET, $(3)) -Wl,--undefined=BootloaderAPI_$(strip $(2))
+BOOT_API_LD_FLAGS := $(call BOOT_SECTION_LD_FLAG, trampolines, Trampolines, (48 + 32 + 8))
+BOOT_API_LD_FLAGS += $(call BOOT_SECTION_LD_FLAG, jumptable, JumpTable, (32 + 8))
+BOOT_API_LD_FLAGS += $(call BOOT_SECTION_LD_FLAG, signatures, Signatures, 8)