X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/1a4a26271e32fba6e2430b7869ec4a8b4242e6e2..8e20e8697ff88d38ac01d62198dbdd552449e4aa:/Bootloaders/DFU/makefile

diff --git a/Bootloaders/DFU/makefile b/Bootloaders/DFU/makefile
index bd7120d8f..14cf3a46f 100644
--- a/Bootloaders/DFU/makefile
+++ b/Bootloaders/DFU/makefile
@@ -96,6 +96,11 @@ F_USB = $(F_CPU)
 # bytes, and so will need to be doubled to obtain the byte address needed by AVR-GCC.
 FLASH_SIZE_KB        = 128
 BOOT_SECTION_SIZE_KB = 4
+
+
+# Formulas used to calculate the starting address of the Bootloader section, and the User Application
+# API jump table (for more information on the latter, see the bootloader documentation). These formulas
+# should not need to be altered - modify the FLASH_SIZE_KB and BOOT_SECTION_KB values above instead.
 BOOT_START           = 0x$(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) - 32)" | bc)
 
@@ -335,7 +340,7 @@ EXTMEMOPTS =
 #    -Map:      create map file
 #    --cref:    add cross reference to  map file
 LDFLAGS  = -Wl,-Map=$(TARGET).map,--cref
-LDFLAGS += -Wl,--section-start=.text=$(BOOT_START) -Wl,--section-start=.apitable=$(BOOT_API_TABLESTART)
+LDFLAGS += -Wl,--section-start=.text=$(BOOT_START) -Wl,--section-start=.apitable=$(BOOT_API_TABLESTART) -Wl,--undefined=BootloaderAPI_JumpTable
 LDFLAGS += -Wl,--relax
 LDFLAGS += -Wl,--gc-sections
 LDFLAGS += $(EXTMEMOPTS)