From b3282abbf709d2a07ad12f42129f32f8e68de6eb Mon Sep 17 00:00:00 2001
From: TuxSH <1922548+TuxSH@users.noreply.github.com>
Date: Mon, 4 Aug 2025 17:03:47 +0200
Subject: [PATCH] Patch lgy k11 to avoid allocating unused pages (bug) which
 was preventing 2 threads to be created

---
 arm9/source/patches.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arm9/source/patches.c b/arm9/source/patches.c
index 53f37dba..44d01926 100644
--- a/arm9/source/patches.c
+++ b/arm9/source/patches.c
@@ -850,6 +850,17 @@ u32 patchLgyK11(u8 *section1, u32 section1Size, u8 *section2, u32 section2Size)
     if ((u8 *)off3 >= section1 + section1Size)
         return 1;
     off3[2] = 0x2001; // movs r0, #1
+
+    // Patch kernel to avoid allocating the two "configuration memory" pages, freeing
+    // 0x2000 bytes of kernel "heap" (which is 0xD000 AXIWRAM bytes on LGY K11 instead
+    // of the entire FCRAM on NFIRM). This is indeed a bug because if prevents two of the
+    // 12 KThread objects from being created
+    u16 *off4;
+    for (off4 = (u16 *)section1; (u8 *)off4 <= section1 + section1Size && (off4[0] != 0xB570 || off4[1] != 0x2200); off4++);
+    if ((u8 *)off4 >= section1 + section1Size)
+        return 1;
+    *off4 = 0x4770; // bx lr
+
     return 0;
 }