From 7a4da4df48c7de409552f61368855b63cb2e1896 Mon Sep 17 00:00:00 2001
From: mwojcik <mw@m-labs.hk>
Date: Tue, 13 Jan 2026 10:26:32 +0800
Subject: [PATCH] mmu: check if remap does anything

---
 libcortex_a9/src/mmu.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libcortex_a9/src/mmu.rs b/libcortex_a9/src/mmu.rs
index 74b2fe2..cbbaf4b 100644
--- a/libcortex_a9/src/mmu.rs
+++ b/libcortex_a9/src/mmu.rs
@@ -407,6 +407,10 @@ impl L1Table {
         let index = (virtual_addr >> 20) as usize;
 
         let entry = &mut self.table[index];
+        if entry.0 & 0x000f_ffff == new_physical_base {
+            // don't waste time with flushing caches if there's no change
+            return;
+        }
         let section = entry.get_section();
         *entry = L1Entry::from_section(new_physical_base, section);