From 33c6f74528b25663f62d7e0ad1be978abacdab56 Mon Sep 17 00:00:00 2001
From: Jack Humbert <jack.humb@gmail.com>
Date: Tue, 17 Oct 2017 16:57:14 -0400
Subject: [PATCH] allow bootloader size to be overwritten

---
 tmk_core/common/avr/bootloader.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tmk_core/common/avr/bootloader.c b/tmk_core/common/avr/bootloader.c
index 34db8d0b0..4f59d961e 100644
--- a/tmk_core/common/avr/bootloader.c
+++ b/tmk_core/common/avr/bootloader.c
@@ -56,14 +56,20 @@
  *          |  Bootloader   | 512B                   |  Bootloader   | 1KB
  * 0x7FFF   +---------------+               0x1FFFF  +---------------+
  */
+
+#if !defined(BOOTLOADER_SIZE) && !defined(BOOTLOADER_START)
+    #warning To use bootloader_jump() you need to define BOOTLOADER_SIZE or BOOTLOADER_START in config.h.
+#endif
+
 #ifndef BOOTLOADER_SIZE
-#warning To use bootloader_jump() you need to define BOOTLOADER_SIZE in config.h.
 #define BOOTLOADER_SIZE     4096
 #endif
 
 #define FLASH_SIZE          (FLASHEND + 1L)
-#define BOOTLOADER_START    (FLASH_SIZE - BOOTLOADER_SIZE)
 
+#ifndef BOOTLOADER_START
+#define BOOTLOADER_START    (FLASH_SIZE - BOOTLOADER_SIZE)
+#endif
 
 /*
  * Entering the Bootloader via Software