Clean up bootloader makefiles to make them a bit more readable.

[pub/USBasp.git] / Bootloaders / DFU / makefile

diff --git a/Bootloaders/DFU/makefile b/Bootloaders/DFU/makefile
index 3ee61fc..cc072f4 100644 (file)
--- a/Bootloaders/DFU/makefile
+++ b/Bootloaders/DFU/makefile
@@ -9,22 +9,6 @@
 #         LUFA Project Makefile.
 # --------------------------------------
 
-# Flash size and bootloader section sizes of the target, in KB. These must
-# match the target's total FLASH size and the bootloader size set in the
-# device's fuses.
-FLASH_SIZE_KB        := 128
-BOOT_SECTION_SIZE_KB := 8
-
-# 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)
-
 MCU          = at90usb1287
 ARCH         = AVR8
 BOARD        = USBKEY
@@ -34,8 +18,26 @@ OPTIMIZATION = s
 TARGET       = BootloaderDFU
 SRC          = $(TARGET).c Descriptors.c BootloaderAPI.c BootloaderAPITable.S $(LUFA_SRC_USB)
 LUFA_PATH    = ../../LUFA/
-CC_FLAGS     = -DUSE_LUFA_CONFIG_HEADER -IConfig/ -DBOOT_START_ADDR=$(BOOT_START)
-LD_FLAGS     = -Wl,--section-start=.text=$(BOOT_START) $(BOOT_API_LD_FLAGS)
+CC_FLAGS     = -DUSE_LUFA_CONFIG_HEADER -IConfig/ -DBOOT_START_ADDR=$(BOOT_START_OFFSET)
+LD_FLAGS     = -Wl,--section-start=.text=$(BOOT_START_OFFSET) $(BOOT_API_LD_FLAGS)
+
+# Flash size and bootloader section sizes of the target, in KB. These must
+# match the target's total FLASH size and the bootloader size set in the
+# device's fuses.
+FLASH_SIZE_KB         = 128
+BOOT_SECTION_SIZE_KB  = 8
+
+# Bootloader address calculation formulas (requires the "bc" unix utility)
+# Do not modify these macros, but rather modify the depedant values above.
+BOOT_START_OFFSET     = 0x$(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 $(1)))" | bc)
+
+# Bootloader linker section flags for relocating the API table sections to
+# known FLASH addresses - these should not normally be user-edited.
+BOOT_SECTION_LD_FLAG  = -Wl,--section-start=.apitable_$(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)
 
 # Default target
 all: