From 1623f315afbbdd480e3d22e41601dbcb5d34d126 Mon Sep 17 00:00:00 2001
From: Yuri D'Elia <wavexx@thregr.org>
Date: Wed, 19 Jan 2022 00:26:59 +0100
Subject: [PATCH] Ensure code doesn't overflow into the MMU bootloader

Take advantage of __TEXT_REGION_LENGTH__ in the avr5 linker script to
preset the effective available space in the flash.

This ensures we don't overflow into the bootloader.
---
 CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e71bb4..8aca20e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -142,6 +142,9 @@ if(CMAKE_CROSSCOMPILING)
   add_link_dependency(firmware ${LINKER_SCRIPT})
   #]]
 
+  # limit the text section to 28K (32K - 4k reserved for the bootloader)
+  target_link_options(firmware PUBLIC -Wl,--defsym=__TEXT_REGION_LENGTH__=28K)
+
   # generate firmware.bin file
   objcopy(firmware "ihex" ".hex")