diff --git a/src/lpc176x/Kconfig b/src/lpc176x/Kconfig
index fa80c463..372b7007 100644
--- a/src/lpc176x/Kconfig
+++ b/src/lpc176x/Kconfig
@@ -25,6 +25,15 @@ config CLOCK_FREQ
     default 25000000 if MACH_LPC1768 # 100000000 / 4
     default 30000000 if MACH_LPC1769 # 120000000 / 4
 
+config SMOOTHIEWARE_BOOTLOADER
+    bool "Target board uses Smoothieware bootloader"
+    default y
+
+config FLASH_START
+    hex
+    default 0x4000 if SMOOTHIEWARE_BOOTLOADER
+    default 0x0000
+
 config USBSERIAL
     bool "Use USB for communication (instead of serial)"
     default y
diff --git a/src/lpc176x/Makefile b/src/lpc176x/Makefile
index 94e6a268..7edd26eb 100644
--- a/src/lpc176x/Makefile
+++ b/src/lpc176x/Makefile
@@ -33,7 +33,7 @@ target-y := $(OUT)LPC1768.ld $(target-y)
 
 $(OUT)LPC1768.ld: lib/lpc176x/device/TOOLCHAIN_GCC_ARM/LPC1768.ld $(OUT)board-link
 	@echo "  Preprocessing $@"
-	$(Q)$(CPP) -P -MD -MT $@ $< -o $@
+	$(Q)$(CPP) -P -MD -MT $@ -DMBED_APP_START=$(CONFIG_FLASH_START) -DMBED_APP_SIZE="(512K - $(CONFIG_FLASH_START))" $< -o $@
 
 # Build the additional bin output file
 target-y += $(OUT)klipper.bin