From 6aca0731b236eb7c2ba519ffafc5220d9ef7be50 Mon Sep 17 00:00:00 2001
From: Nav <nav@navnav.me>
Date: Fri, 26 May 2023 22:42:48 +0100
Subject: [PATCH] Extract EESAVE fuse bit descriptor from AVR8 TDF

---
 .../AVR/AVR8/TargetDescription/TargetDescriptionFile.cpp | 4 ++++
 .../AVR/AVR8/TargetDescription/TargetDescriptionFile.hpp | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/src/Targets/Microchip/AVR/AVR8/TargetDescription/TargetDescriptionFile.cpp b/src/Targets/Microchip/AVR/AVR8/TargetDescription/TargetDescriptionFile.cpp
index 1dd0dbf2..863a2eaf 100644
--- a/src/Targets/Microchip/AVR/AVR8/TargetDescription/TargetDescriptionFile.cpp
+++ b/src/Targets/Microchip/AVR/AVR8/TargetDescription/TargetDescriptionFile.cpp
@@ -381,6 +381,10 @@ namespace Bloom::Targets::Microchip::Avr::Avr8Bit::TargetDescription
         return this->getFuseBitsDescriptorByName("jtagen");
     }
 
+    std::optional<FuseBitsDescriptor> TargetDescriptionFile::getEesaveFuseBitsDescriptor() const {
+        return this->getFuseBitsDescriptorByName("eesave");
+    }
+
     void TargetDescriptionFile::loadSupportedPhysicalInterfaces() {
         auto interfaceNamesToInterfaces = std::map<std::string, PhysicalInterface>({
            {"updi", PhysicalInterface::UPDI},
diff --git a/src/Targets/Microchip/AVR/AVR8/TargetDescription/TargetDescriptionFile.hpp b/src/Targets/Microchip/AVR/AVR8/TargetDescription/TargetDescriptionFile.hpp
index 4d1f3463..ef4769a0 100644
--- a/src/Targets/Microchip/AVR/AVR8/TargetDescription/TargetDescriptionFile.hpp
+++ b/src/Targets/Microchip/AVR/AVR8/TargetDescription/TargetDescriptionFile.hpp
@@ -127,6 +127,15 @@ namespace Bloom::Targets::Microchip::Avr::Avr8Bit::TargetDescription
          */
         [[nodiscard]] std::optional<FuseBitsDescriptor> getJtagenFuseBitsDescriptor() const;
 
+        /**
+         * Constructs a FuseBitDescriptor for the "Preserve EEPROM" (EESAVE) fuse bit, with information extracted from
+         * the TDF.
+         *
+         * @return
+         *  std::nullopt if the EESAVE bit field could not be found in the TDF.
+         */
+        [[nodiscard]] std::optional<FuseBitsDescriptor> getEesaveFuseBitsDescriptor() const;
+
         /**
          * Returns a set of all supported physical interfaces for debugging.
          *