From 983ea451d0346653a4e5dd2f118a769e516fded3 Mon Sep 17 00:00:00 2001
From: negativeExponent <negativeExponent@users.noreply.github.com>
Date: Mon, 5 Jul 2021 00:02:02 +0800
Subject: [PATCH] Flash : Erased memory is FFh-filled

https://akkit.org/info/gbatek.htm#gbacartbackupflashrom
---
 src/gba/Flash.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/gba/Flash.cpp b/src/gba/Flash.cpp
index c3c5585a..9d0124e0 100644
--- a/src/gba/Flash.cpp
+++ b/src/gba/Flash.cpp
@@ -172,13 +172,13 @@ void flashWrite(uint32_t address, uint8_t byte)
         if (byte == 0x30) {
             // SECTOR ERASE
             memset(&flashSaveMemory[(flashBank << 16) + (address & 0xF000)],
-                0,
+                0xff,
                 0x1000);
             systemSaveUpdateCounter = SYSTEM_SAVE_UPDATED;
             flashReadState = FLASH_ERASE_COMPLETE;
         } else if (byte == 0x10) {
             // CHIP ERASE
-            memset(flashSaveMemory, 0, flashSize);
+            memset(flashSaveMemory, 0xff, flashSize);
             systemSaveUpdateCounter = SYSTEM_SAVE_UPDATED;
             flashReadState = FLASH_ERASE_COMPLETE;
         } else {