From 8fe0d35e41df80d5f67b2b2b731247bf5fb5e9a5 Mon Sep 17 00:00:00 2001
From: Matt Alencar <teu.nasc@outlook.com>
Date: Sun, 22 Feb 2026 23:04:06 +0000
Subject: [PATCH 1/2] Add support for OpenBLT Bootloader.

---
 scripts/buildcommands.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/buildcommands.py b/scripts/buildcommands.py
index 1e2ac1041..ebfcd2d59 100644
--- a/scripts/buildcommands.py
+++ b/scripts/buildcommands.py
@@ -222,7 +222,7 @@ class Handle_arm_irq:
             # The ResetHandler was not defined - don't build VectorTable
             return ""
         max_irq = max(self.irqs.keys())
-        table = ["    DefaultHandler,\n"] * (max_irq + armcm_offset + 1)
+        table = ["    DefaultHandler,\n"] * (max_irq + armcm_offset + 2)
         defs = []
         for num, func in self.irqs.items():
             if num < 1 - armcm_offset:
@@ -230,6 +230,7 @@ class Handle_arm_irq:
             defs.append("extern void %s(void);\n" % (func,))
             table[num + armcm_offset] = "    %s,\n" % (func,)
         table[0] = "    &_stack_end,\n"
+        table[-1] = "    (void*)0x55AA11EE,\n"
         fmt = """
 extern void DefaultHandler(void);
 extern uint32_t _stack_end;

From ecfeb4548562218ea4d7b3a39e7fc827f9b5154e Mon Sep 17 00:00:00 2001
From: Matt Alencar <teu.nasc@outlook.com>
Date: Wed, 25 Feb 2026 17:28:26 +0000
Subject: [PATCH 2/2] Automate the process of build .srec file, and added
 print-openblt-vector-table-cs-offset helper, that prints
 BOOT_FLASH_VECTOR_TABLE_CS_OFFSET value for OpenBLT bootloader.

---
 src/stm32/Makefile | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/stm32/Makefile b/src/stm32/Makefile
index 3c158d518..b382f7f21 100644
--- a/src/stm32/Makefile
+++ b/src/stm32/Makefile
@@ -92,11 +92,25 @@ src-$(CONFIG_HAVE_GPIO_SDIO) += stm32/sdio.c
 
 # Binary output file rules
 target-y += $(OUT)klipper.bin
+target-y += $(OUT)klipper.srec
 
 $(OUT)klipper.bin: $(OUT)klipper.elf
 	@echo "  Creating bin file $@"
 	$(Q)$(OBJCOPY) -O binary $< $@
 
+$(OUT)klipper.srec: $(OUT)klipper.bin
+	@echo "  Creating srec file $@"
+	$(Q)$(OBJCOPY) -I binary -O srec --change-addresses "$(CONFIG_FLASH_APPLICATION_ADDRESS)" $< $@
+
+# Print OpenBLT BOOT_FLASH_VECTOR_TABLE_CS_OFFSET
+print-openblt-vector-table-cs-offset:
+	@addr=`$(OBJDUMP) -s -j .text $(OUT)klipper.elf | grep ee11aa55 | awk '{print $$1}'`; \
+	if [ -z "$$addr" ]; then \
+		echo "Pattern not found"; \
+		exit 1; \
+	fi; \
+	printf "BOOT_FLASH_VECTOR_TABLE_CS_OFFSET: 0x%X\n" $$((0x$$addr - $(CONFIG_FLASH_APPLICATION_ADDRESS)))
+
 # Flash rules
 lib/hidflash/hid-flash:
 	@echo "  Building hid-flash"