jdlo modifications

docs/Build.md

@@ -22,15 +22,6 @@ Or use Qt Creator (Create Project -> Import Project -> Git Clone).
 
 Android has a completely different build process than other platforms. See its [dedicated page](build/Android.md).
 
-## Cross-compile ARM64
-
-A painless guide for cross compilation (or to test NCE) from a x86_64 system without polluting your main.
-
-- Install QEMU: `sudo pkg install qemu`
-- Download Debian 13: `wget https://cdimage.debian.org/debian-cd/current/arm64/iso-cd/debian-13.0.0-arm64-netinst.iso`
-- Create a system disk: `qemu-img create -f qcow2 debian-13-arm64-ci.qcow2 30G`
-- Run the VM: `qemu-system-aarch64 -M virt -m 2G -cpu max -bios /usr/local/share/qemu/edk2-aarch64-code.fd -drive if=none,file=debian-13.0.0-arm64-netinst.iso,format=raw,id=cdrom -device scsi-cd,drive=cdrom -drive if=none,file=debian-13-arm64-ci.qcow2,id=hd0,format=qcow2 -device virtio-blk-device,drive=hd0 -device virtio-gpu-pci -device usb-ehci -device usb-kbd -device intel-hda -device hda-output -nic user,model=virtio-net-pci`
-
 ## Initial Configuration
 
 If the configure phase fails, see the `Troubleshooting` section below. Usually, as long as you followed the dependencies guide, the defaults *should* successfully configure and build.

docs/Caveats.md

@@ -93,11 +93,6 @@ Eden is not currently available as a port on FreeBSD, though it is in the works.
 
 The available OpenSSL port (3.0.17) is out-of-date, and using a bundled static library instead is recommended; to do so, add `-DYUZU_USE_BUNDLED_OPENSSL=ON` to your CMake configure command.
 
-Gamepad/controllers may not work on 15.0, this is due to an outdated SDL not responding well to the new `usbhid(2)` driver. To workaround this simply disable `usbhid(2)` (add the following to `/boot/loader.conf`):
-```sh
-hw.usb.usbhid.enable="0"
-```
-
 ## NetBSD
 
 Install `pkgin` if not already `pkg_add pkgin`, see also the general [pkgsrc guide](https://www.netbsd.org/docs/pkgsrc/using.html). For NetBSD 10.1 provide `echo 'PKG_PATH="https://cdn.netbsd.org/pub/pkgsrc/packages/NetBSD/x86_64/10.0_2025Q3/All/"' >/etc/pkg_install.conf`. If `pkgin` is taking too much time consider adding the following to `/etc/rc.conf`:
@@ -201,24 +196,14 @@ windeployqt6 --no-compiler-runtime --no-opengl-sw --no-system-dxc-compiler \
 find ./*/ -name "*.dll" | while read -r dll; do deps "$dll"; done
 ```
 
-## RedoxOS
-
-The package install may randomly hang at times, in which case it has to be restarted. ALWAYS do a `sudo pkg update` or the chances of it hanging will be close to 90%. If "multiple" installs fail at once, try installing 1 by 1 the packages.
-
-When CMake invokes certain file syscalls - it may sometimes cause crashes or corruptions on the (kernel?) address space - so reboot the system if there is a "hang" in CMake.
-
-## Windows
-
-### Windows 7, Windows 8 and Windows 8.1
+## Windows 8.1 and below
 
 DirectX 12 is not available - simply copy and paste a random DLL and name it `d3d12.dll`.
 
 Install [Qt6 compatibility libraries](github.com/ANightly/qt6windows7) specifically Qt 6.9.5.
 
-### Windows Vista and below
+## RedoxOS
 
-No support for Windows Vista (or below) is present at the moment. Check back later.
+The package install may randomly hang at times, in which case it has to be restarted. ALWAYS do a `sudo pkg update` or the chances of it hanging will be close to 90%. If "multiple" installs fail at once, try installing 1 by 1 the packages.
 
-### Windows on ARM
-
-If you're using Snapdragon X or 8CX, use the [the Vulkan translation layer](https://apps.microsoft.com/detail/9nqpsl29bfff?hl=en-us&gl=USE) only if the stock drivers do not work. And of course always keep your system up-to-date.
+When CMake invokes certain file syscalls - it may sometimes cause crashes or corruptions on the (kernel?) address space - so reboot the system if there is a "hang" in CMake.

docs/Coding.md

@@ -10,13 +10,7 @@ Simply put, types/classes are named as `PascalCase`, same for methods and functi
 
 Except for Qt MOC where `functionName` is preferred.
 
-Template typenames prefer short names like `T`, `I`, `U`, if a longer name is required either `Iterator` or `perform_action` are fine as well. Do not use names like `SS` as systems like solaris define it for registers, in general do not use any of the following for short names:
-- `SS`, `DS`, `GS`, `FS`: Segment registers, defined by Solaris `<ucontext.h>`
-- `EAX`, `EBX`, `ECX`, `EDX`, `ESI`, `EDI`, `ESP`, `EBP`, `EIP`: Registers, defined by Solaris.
-- `X`: Defined by some utility headers, avoid.
-- `_`: Defined by gettext, avoid.
-- `N`, `M`, `S`: Preferably don't use this for types, use it for numeric constants.
-- `TR`: Used by some weird `<ucontext.h>` whom define the Task Register as a logical register to provide to the user... (Need to remember which OS in specific).
+Template typenames prefer short names like `T`, `I`, `U`, if a longer name is required either `Iterator` or `perform_action` are fine as well.
 
 Macros must always be in `SCREAMING_CASE`. Do not use short letter macros as systems like Solaris will conflict with them; a good rule of thumb is >5 characters per macro - i.e `THIS_MACRO_IS_GOOD`, `AND_ALSO_THIS_ONE`.
 
@@ -24,45 +18,25 @@ Try not using hungarian notation, if you're able.
 
 ## Formatting
 
-Formatting is extremelly lax, the general rule of thumb is: Don't add new lines just to increase line count. The less lines we have to look at, the better. This means also packing densely your code while not making it a clusterfuck. Strike a balance of "this is a short and comprehensible piece of code" and "my eyes are actually happy to see this!". Don't just drop the entire thing in a single line and call it "dense code", that's just spaghetti posing as code. In general, be mindful of what other devs need to look at.
-
 Do not put if/while/etc braces after lines:
 ```c++
 // no dont do this
-// this is more lines of code for no good reason (why braces need their separate lines?)
-// and those take space in someone's screen, cumulatively
 if (thing)
-{ //<--
+{
     some(); // ...
-} //<-- 2 lines of code for basically "opening" and "closing" an statment
+}
 
 // do this
-if (thing) { //<-- [...] and with your brain you can deduce it's this piece of code
-             //    that's being closed
+if (thing) {
     some(); // ...
-} //<-- only one line, and it's clearer since you know its closing something [...]
+}
 
-// or this, albeit the extra line isn't needed (at your discretion of course)
+// or this
 if (thing)
     some(); // ...
 
-// this is also ok, keeps things in one line and makes it extremely clear
+// this is also ok
 if (thing) some();
-
-// NOT ok, don't be "clever" and use the comma operator to stash a bunch of statments
-// in a single line, doing this will definitely ruin someone's day - just do the thing below
-// vvv
-if (thing) some(), thing(), a2(a1(), y1(), j1()), do_complex_shit(wa(), wo(), ploo());
-// ... and in general don't use the comma operator for "multiple statments", EXCEPT if you think
-// that it makes the code more readable (the situation may be rare however)
-
-// Wow so much clearer! Now I can actually see what each statment is meant to do!
-if (thing) {
-    some();
-    thing();
-    a2(a1(), y1(), j1());
-    do_complex_shit(wa(), wo(), ploo());
-}
 ```
 
 Brace rules are lax, if you can get the point across, do it:
@@ -103,21 +77,3 @@ if (device_name.empty()) {
 SDL_AudioSpec obtained;
 device = SDL_OpenAudioDevice(device_name.empty() ? nullptr : device_name.c_str(), capture, &spec, &obtained, false);
 ```
-
-A note about operators: Use them sparingly, yes, the language is lax on them, but some usages can be... tripping to say the least.
-```c++
-a, b, c; //<-- NOT OK multiple statments with comma operator is definitely a recipe for disaster
-return c ? a : b; //<-- OK ternaries at end of return statments are clear and fine
-return a, b; //<-- NOT OK return will take value of `b` but also evaluate `a`, just use a separate statment
-void f(int a[]) //<-- OK? if you intend to use the pointer as an array, otherwise just mark it as *
-```
-
-And about templates, use them sparingly, don't just do meta-templating for the sake of it, do it when you actually need it. This isn't a competition to see who can make the most complicated and robust meta-templating system. Just use what works, and preferably stick to the standard libary instead of reinventing the wheel. Additionally:
-
-```c++
-// NOT OK This will create (T * N * C * P) versions of the same function. DO. NOT. DO. THIS.
-template<typename T, size_t N, size_t C, size_t P> inline void what() const noexcept;
-
-// OK use parameters like a normal person, don't be afraid to use them :)
-template<typename T> inline void what(size_t n, size_t c, size_t p) const noexcept;
-```

docs/CrossCompile.md

@@ -0,0 +1,10 @@
+# Cross Compile
+
+## ARM64
+
+A painless guide for cross compilation (or to test NCE) from a x86_64 system without polluting your main.
+
+- Install QEMU: `sudo pkg install qemu`
+- Download Debian 13: `wget https://cdimage.debian.org/debian-cd/current/arm64/iso-cd/debian-13.0.0-arm64-netinst.iso`
+- Create a system disk: `qemu-img create -f qcow2 debian-13-arm64-ci.qcow2 30G`
+- Run the VM: `qemu-system-aarch64 -M virt -m 2G -cpu max -bios /usr/local/share/qemu/edk2-aarch64-code.fd -drive if=none,file=debian-13.0.0-arm64-netinst.iso,format=raw,id=cdrom -device scsi-cd,drive=cdrom -drive if=none,file=debian-13-arm64-ci.qcow2,id=hd0,format=qcow2 -device virtio-blk-device,drive=hd0 -device virtio-gpu-pci -device usb-ehci -device usb-kbd -device intel-hda -device hda-output -nic user,model=virtio-net-pci`

docs/Deps.md

@@ -294,22 +294,22 @@ sudo pkg install qt6 boost glslang libzip library/lz4 libusb-1 nlohmann-json ope
 
 * Open the `MSYS2 MinGW 64-bit` shell (`mingw64.exe`)
 * Download and install all dependencies:
-```sh
+```
 BASE="git make autoconf libtool automake-wrapper jq patch"
-MINGW="qt6-base qt6-tools qt6-translations qt6-svg cmake toolchain clang python-pip openssl vulkan-memory-allocator vulkan-devel glslang boost fmt lz4 nlohmann-json zlib zstd enet opus mbedtls libusb unordered_dense openssl SDL2"
-# Either x86_64 or clang-aarch64 (Windows on ARM)
+
+MINGW="qt6-base qt6-tools qt6-translations qt6-svg cmake toolchain clang python-pip openssl vulkan-memory-allocator vulkan-devel glslang boost fmt lz4 nlohmann-json zlib zstd enet opus mbedtls libusb unordered_dense"
+
 packages="$BASE"
 for pkg in $MINGW; do
     packages="$packages mingw-w64-x86_64-$pkg"
-    #packages="$packages mingw-w64-clang-aarch64-$pkg"
 done
+
 pacman -Syuu --needed --noconfirm $packages
 ```
 * Notes:
   - Using `qt6-static` is possible but currently untested.
   - Other environments are entirely untested, but should theoretically work provided you install all the necessary packages.
   - GCC is proven to work better with the MinGW environment. If you choose to use Clang, you *may* be better off using the clang64 environment.
-  - ...except on ARM64, we recommend using clang instead of GCC for Windows ARM64.
   - Add `qt-creator` to the `MINGW` variable to install Qt Creator. You can then create a Start Menu shortcut to the MinGW Qt Creator by running `powershell "\$s=(New-Object -COM WScript.Shell).CreateShortcut('C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\Qt Creator.lnk');\$s.TargetPath='C:\\msys64\\mingw64\\bin\\qtcreator.exe';\$s.Save()"` in Git Bash or MSYS2.
 * Add MinGW binaries to the PATH if they aren't already:
   * `echo 'PATH=/mingw64/bin:$PATH' >> ~/.bashrc`

src/core/CMakeLists.txt

@@ -17,8 +17,6 @@ add_library(core STATIC
     constants.h
     core.cpp
     core.h
-    game_settings.cpp
-    game_settings.h
     core_timing.cpp
     core_timing.h
     cpu_manager.cpp
@@ -45,7 +43,11 @@ add_library(core STATIC
     device_memory.cpp
     device_memory.h
     device_memory_manager.h
+    device_memory.h
+    device_memory_manager.h
     device_memory_manager.inc
+    internal_network/legacy_online.cpp
+    internal_network/legacy_online.h
     file_sys/bis_factory.cpp
     file_sys/bis_factory.h
     file_sys/card_image.cpp

src/core/core.cpp

@@ -49,6 +49,7 @@
 #include "core/hle/service/services.h"
 #include "core/hle/service/set/system_settings_server.h"
 #include "core/hle/service/sm/sm.h"
+#include "core/internal_network/legacy_online.h"
 #include "core/internal_network/network.h"
 #include "core/loader/loader.h"
 #include "core/memory.h"
@@ -137,6 +138,13 @@ struct System::Impl {
         kernel.SetMulticore(is_multicore);
         cpu_manager.SetMulticore(is_multicore);
         cpu_manager.SetAsyncGpu(is_async_gpu);
+        cpu_manager.SetMulticore(is_multicore);
+        cpu_manager.SetAsyncGpu(is_async_gpu);
+
+        if (!legacy_online) {
+            legacy_online = std::make_unique<Network::LegacyOnlineService>();
+            legacy_online->Start();
+        }
     }
 
     void ReinitializeIfNecessary(System& system) {
@@ -293,6 +301,48 @@ struct System::Impl {
         return SystemResultStatus::Success;
     }
 
+
+    void LoadOverrides(u64 programId) const {
+        std::string vendor = gpu_core->Renderer().GetDeviceVendor();
+        LOG_INFO(Core, "GPU Vendor: {}", vendor);
+
+        // Reset all per-game flags
+        Settings::values.use_squashed_iterated_blend = false;
+
+        // Insert PC overrides here
+
+    #ifdef ANDROID
+        // Example on how to set a setting based on the program ID and vendor
+        if (programId == 0x010028600EBDA000 && vendor == "Mali") { // Mario 3d World
+          // Settings::values.example = true;
+        }
+
+        // Example array of program IDs
+        const std::array<u64, 10> example_array = {
+                //0xprogramId
+                0x0004000000033400, // Game 1
+                0x0004000000033500 // Game 2
+                // And so on
+        };
+
+        for (auto id : example_array) {
+            if (programId == id) {
+             // Settings::values.example = true;
+                break;
+            }
+        }
+
+    #endif
+
+        // Ninja Gaiden Ragebound
+        constexpr u64 ngr = 0x0100781020710000ULL;
+
+        if (programId == ngr) {
+            LOG_INFO(Core, "Enabling game specifc override: use_squashed_iterated_blend");
+            Settings::values.use_squashed_iterated_blend = true;
+        }
+    }
+
     SystemResultStatus Load(System& system, Frontend::EmuWindow& emu_window,
                             const std::string& filepath,
                             Service::AM::FrontendAppletParameters& params) {
@@ -378,8 +428,7 @@ struct System::Impl {
             LOG_ERROR(Core, "Failed to find program id for ROM");
         }
 
-
-        GameSettings::LoadOverrides(program_id, gpu_core->Renderer());
+        LoadOverrides(program_id);
         if (auto room_member = Network::GetRoomMember().lock()) {
             Network::GameInfo game_info;
             game_info.name = name;
@@ -428,6 +477,11 @@ struct System::Impl {
         stop_event = {};
         Network::RestartSocketOperations();
 
+        if (legacy_online) {
+            legacy_online->Stop();
+            legacy_online.reset();
+        }
+
         if (auto room_member = Network::GetRoomMember().lock()) {
             Network::GameInfo game_info{};
             room_member->SendGameInfo(game_info);
@@ -516,6 +570,9 @@ struct System::Impl {
 
     /// Network instance
     Network::NetworkInstance network_instance;
+    
+    /// Legacy Online Service
+    std::unique_ptr<Network::LegacyOnlineService> legacy_online;
 
     /// Debugger
     std::unique_ptr<Core::Debugger> debugger;

src/core/file_sys/savedata_factory.cpp

@@ -11,6 +11,8 @@
 #include "core/core.h"
 #include "core/file_sys/savedata_factory.h"
 #include "core/file_sys/vfs/vfs.h"
+#include "core/file_sys/sdmc_factory.h"
+#include "core/hle/service/filesystem/filesystem.h"
 
 namespace FileSys {
 
@@ -74,20 +76,97 @@ VirtualDir SaveDataFactory::Create(SaveDataSpaceId space, const SaveDataAttribut
 
 VirtualDir SaveDataFactory::Open(SaveDataSpaceId space, const SaveDataAttribute& meta) const {
 
-    const auto save_directory = GetFullPath(program_id, dir, space, meta.type, meta.program_id,
+    u64 target_program_id = meta.program_id;
+    // CRITICAL FIX: If the game requests Cache/Temp with ProgramID 0 (generic),
+    // we MUST redirect it to the actual running TitleID, otherwise it looks in '.../0000000000000000'.
+    if ((meta.type == SaveDataType::Cache || meta.type == SaveDataType::Temporary) && target_program_id == 0) {
+        target_program_id = system.GetApplicationProcessProgramID();
+        LOG_INFO(Service_FS, "Redirecting generic Cache request (ID 0) to active TitleID: {:016X}", target_program_id);
+    }
+
+    const auto save_directory = GetFullPath(program_id, dir, space, meta.type, target_program_id,
                                             meta.user_id, meta.system_save_data_id);
 
     auto out = dir->GetDirectoryRelative(save_directory);
 
+    // Fallback for Ryujinx-style cache paths: sdcard/Nintendo/save/{TitleID} (No /cache/ subdir)
+    // Also include Temporary, as games like Just Dance use Temporary storage for cache-like data (MapBaseCache),
+    // and Ryujinx stores this in the same simple 'save/{ID}' structure.
+    // Fallback logic removed. We now enforce standard paths.
+    // User instructions will direct them to the correct folder.
+
+    if (out == nullptr) {
+        LOG_WARNING(Service_FS, "Cache/Save path NOT FOUND: '{}'. Auto-create={}", save_directory, auto_create);
+    } else {
+        LOG_INFO(Service_FS, "Cache/Save path FOUND: '{}'", save_directory);
+    }
+
     if (out == nullptr && (ShouldSaveDataBeAutomaticallyCreated(space, meta) && auto_create)) {
+        LOG_INFO(Service_FS, "Auto-creating save directory...");
         return Create(space, meta);
     }
 
+    if (out != nullptr) {
+        // Some emulators (Ryujinx) or even different firmware versions may rely on the commit
+        // directories /0 or /1 being present for cache or save data.
+        // We prioritizing /1 as it usually implies a newer commit if both exist,
+        // but /0 is what's commonly used by Ryujinx for cache.
+
+        // Ryujinx behavior: If 0 exists and 1 does not, copy 0 to 1.
+        auto dir_0 = out->GetSubdirectory("0");
+        auto dir_1 = out->GetSubdirectory("1");
+
+        if (dir_0) LOG_INFO(Service_FS, "Found subdirectory '0' in save path.");
+        if (dir_1) LOG_INFO(Service_FS, "Found subdirectory '1' in save path.");
+
+        if (dir_0 != nullptr && dir_1 == nullptr) {
+            LOG_INFO(Service_FS, "Ryujinx structure detected: '0' exists, '1' missing. Copying 0->1 for compatibility.");
+            dir_1 = out->CreateSubdirectory("1");
+            if (dir_1 != nullptr) {
+                // Copy contents from 0 to 1
+                VfsRawCopyD(dir_0, dir_1);
+            }
+        }
+
+        // Check for 'Addressables' and 'Addressables2' and delete 'json.cache' if present.
+        // This is a specific workaround for games (e.g. Just Dance) that freeze if they find old cache metadata.
+        // We force them to regenerate it.
+        const auto CleanCache = [](VirtualDir root) {
+            if (root == nullptr) return;
+            const char* subdirs[] = {"Addressables", "Addressables2"};
+            for (const char* subdir_name : subdirs) {
+                auto subdir = root->GetSubdirectory(subdir_name);
+                if (subdir != nullptr) {
+                    if (subdir->DeleteFile("json.cache")) {
+                        LOG_INFO(Service_FS, "Deleted stale 'json.cache' in '{}'", subdir_name);
+                    }
+                }
+            }
+        };
+
+        if (dir_1 != nullptr) {
+            LOG_INFO(Service_FS, "Returning subdirectory '1' as Save Root.");
+            CleanCache(dir_1);
+            return dir_1;
+        }
+        if (dir_0 != nullptr) {
+            LOG_INFO(Service_FS, "Returning subdirectory '0' as Save Root.");
+            CleanCache(dir_0);
+            return dir_0;
+        }
+        
+        LOG_INFO(Service_FS, "No '0' or '1' subdirectories found. Returning parent folder as Save Root.");
+        CleanCache(out);
+    }
+
     return out;
 }
 
 VirtualDir SaveDataFactory::GetSaveDataSpaceDirectory(SaveDataSpaceId space) const {
-    return dir->GetDirectoryRelative(GetSaveDataSpaceIdPath(space));
+    const auto path = GetSaveDataSpaceIdPath(space);
+    // Ensure the directory exists, otherwise FindAllSaves fails.
+    return GetOrCreateDirectoryRelative(dir, path);
+    // return dir->GetDirectoryRelative(GetSaveDataSpaceIdPath(space));
 }
 
 std::string SaveDataFactory::GetSaveDataSpaceIdPath(SaveDataSpaceId space) {
@@ -96,12 +175,12 @@ std::string SaveDataFactory::GetSaveDataSpaceIdPath(SaveDataSpaceId space) {
         return "/system/";
     case SaveDataSpaceId::User:
     case SaveDataSpaceId::SdUser:
+    case SaveDataSpaceId::Temporary: // Map into User so we can find the save/ folder
         return "/user/";
-    case SaveDataSpaceId::Temporary:
-        return "/temp/";
     default:
-        ASSERT_MSG(false, "Unrecognized SaveDataSpaceId: {:02X}", static_cast<u8>(space));
-        return "/unrecognized/"; ///< To prevent corruption when ignoring asserts.
+        // ASSERT_MSG(false, "Unrecognized SaveDataSpaceId: {:02X}", static_cast<u8>(space));
+        LOG_WARNING(Service_FS, "Unrecognized SaveDataSpaceId: {:02X}, defaulting to /user/", static_cast<u8>(space));
+        return "/user/"; 
     }
 }
 
@@ -137,8 +216,9 @@ std::string SaveDataFactory::GetFullPath(ProgramId program_id, VirtualDir dir,
         return fmt::format("{}save/{:016X}/{:016X}{:016X}/{:016X}", out, 0, user_id[1], user_id[0],
                            title_id);
     case SaveDataType::Temporary:
-        return fmt::format("{}{:016X}/{:016X}{:016X}/{:016X}", out, 0, user_id[1], user_id[0],
-                           title_id);
+        // Unified Cache/Temporary Path: Always use save/cache/{TitleID}
+        // This simplifies user instructions and avoids UUID/Permission issues.
+        return fmt::format("{}save/cache/{:016X}", out, title_id);
     case SaveDataType::Cache:
         return fmt::format("{}save/cache/{:016X}", out, title_id);
     default:

src/core/hle/service/filesystem/filesystem.cpp

@@ -686,6 +686,154 @@ void FileSystemController::CreateFactories(FileSys::VfsFilesystem& vfs, bool ove
     using EdenPath = Common::FS::EdenPath;
     const auto sdmc_dir_path = Common::FS::GetEdenPath(EdenPath::SDMCDir);
     const auto sdmc_load_dir_path = sdmc_dir_path / "atmosphere/contents";
+
+    // If the NAND user save location doesn't exist but the SDMC contains
+    // Nintendo/save (common portable save structure), create a host-side
+    // symlink so the emulator will see those saves under the expected NAND path.
+    // This helps users who placed saves under `<eden>/user/sdmc/Nintendo/save/...`.
+    try {
+        const auto nand_fs_path = Common::FS::GetEdenPath(EdenPath::NANDDir);
+        const auto sdmc_fs_path = sdmc_dir_path;
+        const auto nand_user_save_path = nand_fs_path / "user" / "save";
+        const auto sdmc_nintendo_save_path = sdmc_fs_path / "Nintendo" / "save";
+
+        std::error_code ec;
+        if (!std::filesystem::exists(nand_user_save_path) &&
+            std::filesystem::exists(sdmc_nintendo_save_path)) {
+            std::filesystem::create_directory_symlink(sdmc_nintendo_save_path, nand_user_save_path, ec);
+            if (ec) {
+                LOG_WARNING(Service_FS, "Could not create symlink {} -> {}: {}",
+                            Common::FS::PathToUTF8String(nand_user_save_path),
+                            Common::FS::PathToUTF8String(sdmc_nintendo_save_path), ec.message());
+
+                // Fallback: copy the SDMC saves into the NAND save folder so the emulator can see them
+                try {
+                    if (!std::filesystem::exists(nand_user_save_path)) {
+                        std::filesystem::create_directories(nand_user_save_path);
+                    }
+                    std::filesystem::copy(sdmc_nintendo_save_path, nand_user_save_path,
+                                          std::filesystem::copy_options::recursive |
+                                              std::filesystem::copy_options::skip_existing,
+                                          ec);
+                    if (ec) {
+                        LOG_WARNING(Service_FS, "Failed to copy SDMC saves to {}: {}",
+                                    Common::FS::PathToUTF8String(nand_user_save_path), ec.message());
+                    } else {
+                        LOG_INFO(Service_FS, "Copied SDMC saves to NAND save path: {} -> {}",
+                                 Common::FS::PathToUTF8String(sdmc_nintendo_save_path),
+                                 Common::FS::PathToUTF8String(nand_user_save_path));
+                    }
+                } catch (const std::exception& ex) {
+                    LOG_WARNING(Service_FS, "Exception while copying SDMC saves: {}", ex.what());
+                }
+            } else {
+                LOG_INFO(Service_FS, "Linked NAND save path to SDMC saves: {} -> {}",
+                         Common::FS::PathToUTF8String(nand_user_save_path),
+                         Common::FS::PathToUTF8String(sdmc_nintendo_save_path));
+            }
+        }
+
+            // Also support official-style SD cache directory name used by some Switch setups.
+            // If users placed saves or cache under `<eden>/user/sdmc/Nintendo/SD_Cache.0000`,
+            // expose it to the NAND user save path as well so the emulator can find them.
+            const auto sdmc_nintendo_cache_path = sdmc_fs_path / "Nintendo" / "SD_Cache.0000";
+            if (!std::filesystem::exists(nand_user_save_path) &&
+                std::filesystem::exists(sdmc_nintendo_cache_path)) {
+                std::error_code ec2;
+                std::filesystem::create_directory_symlink(sdmc_nintendo_cache_path, nand_user_save_path,
+                                                         ec2);
+                if (ec2) {
+                    LOG_WARNING(Service_FS,
+                                "Could not create symlink {} -> {}: {}",
+                                Common::FS::PathToUTF8String(nand_user_save_path),
+                                Common::FS::PathToUTF8String(sdmc_nintendo_cache_path), ec2.message());
+
+                    // Fallback: copy the SDMC cache into the NAND save folder so the emulator can see them
+                    try {
+                        if (!std::filesystem::exists(nand_user_save_path)) {
+                            std::filesystem::create_directories(nand_user_save_path);
+                        }
+                        std::filesystem::copy(sdmc_nintendo_cache_path, nand_user_save_path,
+                                              std::filesystem::copy_options::recursive |
+                                                  std::filesystem::copy_options::skip_existing,
+                                              ec2);
+                        if (ec2) {
+                            LOG_WARNING(Service_FS, "Failed to copy SDMC cache to {}: {}",
+                                        Common::FS::PathToUTF8String(nand_user_save_path), ec2.message());
+                        } else {
+                            LOG_INFO(Service_FS, "Copied SDMC cache to NAND save path: {} -> {}",
+                                     Common::FS::PathToUTF8String(sdmc_nintendo_cache_path),
+                                     Common::FS::PathToUTF8String(nand_user_save_path));
+                        }
+                    } catch (const std::exception& ex) {
+                        LOG_WARNING(Service_FS, "Exception while copying SDMC cache: {}", ex.what());
+                    }
+                } else {
+                    LOG_INFO(Service_FS, "Linked NAND save path to SDMC cache: {} -> {}",
+                             Common::FS::PathToUTF8String(nand_user_save_path),
+                             Common::FS::PathToUTF8String(sdmc_nintendo_cache_path));
+                }
+            }
+
+            // If the NAND save folder already exists, ensure individual entries from
+            // SDMC (both `Nintendo/save` and `Nintendo/SD_Cache.0000`) are visible
+            // inside it: create per-entry symlinks (with copy fallback) for missing
+            // title/account directories so saves placed in SDMC are reachable.
+            auto try_merge_sdmc_entries = [&](const std::filesystem::path& sdmc_src) {
+                try {
+                    if (!std::filesystem::exists(sdmc_src))
+                        return;
+
+                    std::error_code ec;
+                    if (!std::filesystem::exists(nand_user_save_path))
+                        std::filesystem::create_directories(nand_user_save_path, ec);
+
+                    for (auto& ent : std::filesystem::directory_iterator(sdmc_src)) {
+                        const auto name = ent.path().filename();
+                        const auto target = nand_user_save_path / name;
+                        if (std::filesystem::exists(target))
+                            continue;
+
+                        std::error_code ec2;
+                        std::filesystem::create_directory_symlink(ent.path(), target, ec2);
+                        if (ec2) {
+                            LOG_WARNING(Service_FS, "Could not create symlink {} -> {}: {}",
+                                        Common::FS::PathToUTF8String(target),
+                                        Common::FS::PathToUTF8String(ent.path()), ec2.message());
+                            try {
+                                std::filesystem::copy(ent.path(), target,
+                                                      std::filesystem::copy_options::recursive |
+                                                          std::filesystem::copy_options::skip_existing,
+                                                      ec2);
+                                if (ec2) {
+                                    LOG_WARNING(Service_FS, "Failed to copy {} -> {}: {}",
+                                                Common::FS::PathToUTF8String(ent.path()),
+                                                Common::FS::PathToUTF8String(target), ec2.message());
+                                } else {
+                                    LOG_INFO(Service_FS, "Copied SDMC entry to NAND: {} -> {}",
+                                             Common::FS::PathToUTF8String(ent.path()),
+                                             Common::FS::PathToUTF8String(target));
+                                }
+                            } catch (const std::exception& ex) {
+                                LOG_WARNING(Service_FS, "Exception while copying SDMC entry: {}",
+                                            ex.what());
+                            }
+                        } else {
+                            LOG_INFO(Service_FS, "Linked NAND entry to SDMC: {} -> {}",
+                                     Common::FS::PathToUTF8String(target),
+                                     Common::FS::PathToUTF8String(ent.path()));
+                        }
+                    }
+                } catch (const std::exception& ex) {
+                    LOG_WARNING(Service_FS, "Exception while merging SDMC entries: {}", ex.what());
+                }
+            };
+
+            try_merge_sdmc_entries(sdmc_nintendo_save_path);
+            try_merge_sdmc_entries(sdmc_nintendo_cache_path);
+    } catch (const std::exception& e) {
+        LOG_WARNING(Service_FS, "Exception while linking SDMC saves: {}", e.what());
+    }
     const auto rw_mode = FileSys::OpenMode::ReadWrite;
 
     auto nand_directory =

src/core/internal_network/legacy_online.cpp

@@ -0,0 +1,164 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "core/internal_network/legacy_online.h"
+
+#include <cstring>
+#include <iostream>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#endif
+
+#include "common/logging/log.h"
+
+namespace Network {
+
+LegacyOnlineService::LegacyOnlineService() = default;
+
+LegacyOnlineService::~LegacyOnlineService() {
+    Stop();
+}
+
+void LegacyOnlineService::Start() {
+    if (is_running) {
+        return;
+    }
+
+    is_running = true;
+    worker_thread = std::thread(&LegacyOnlineService::ServerLoop, this);
+}
+
+void LegacyOnlineService::Stop() {
+    if (!is_running) {
+        return;
+    }
+
+    is_running = false;
+
+    // Close socket to wake up the thread if it's blocked on recvfrom
+    if (socket_fd != ~0ULL) {
+#ifdef _WIN32
+        closesocket(static_cast<SOCKET>(socket_fd));
+#else
+        close(static_cast<int>(socket_fd));
+#endif
+        socket_fd = ~0ULL;
+    }
+
+    if (worker_thread.joinable()) {
+        worker_thread.join();
+    }
+}
+
+void LegacyOnlineService::ServerLoop() {
+    LOG_INFO(Network, "Starting Legacy Online UDP Server on port {}", PORT);
+
+#ifdef _WIN32
+    WSADATA wsa_data;
+    if (WSAStartup(MAKEWORD(2, 2), &wsa_data) != 0) {
+        LOG_ERROR(Network, "WSAStartup failed");
+        is_running = false;
+        return;
+    }
+#endif
+
+
+
+    auto s = socket(AF_INET, SOCK_DGRAM, 0);
+#ifdef _WIN32
+    if (s == INVALID_SOCKET) {
+#else
+    if (s == -1) {
+#endif
+        LOG_ERROR(Network, "Failed to create socket");
+        is_running = false;
+        return;
+    }
+    socket_fd = static_cast<uintptr_t>(s);
+
+    int opt = 1;
+#ifdef _WIN32
+    setsockopt(static_cast<SOCKET>(socket_fd), SOL_SOCKET, SO_REUSEADDR, (const char*)&opt, sizeof(opt));
+#else
+    setsockopt(static_cast<int>(socket_fd), SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
+#endif
+
+    sockaddr_in server_addr{};
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_addr.s_addr = INADDR_ANY;
+    server_addr.sin_port = htons(PORT);
+
+    int res = -1;
+#ifdef _WIN32
+    res = bind(static_cast<SOCKET>(socket_fd), (sockaddr*)&server_addr, sizeof(server_addr));
+#else
+    res = bind(static_cast<int>(socket_fd), (sockaddr*)&server_addr, sizeof(server_addr));
+#endif
+
+    if (res < 0) {
+        LOG_ERROR(Network, "Failed to bind to port {}", PORT);
+#ifdef _WIN32
+        closesocket(static_cast<SOCKET>(socket_fd));
+#else
+        close(static_cast<int>(socket_fd));
+#endif
+        socket_fd = ~0ULL;
+        is_running = false;
+        return;
+    }
+
+    LOG_INFO(Network, "Legacy Online Server waiting for messages...");
+    
+    // Set a timeout for recvfrom so check is_running periodically if not closed via socket
+    // Alternatively, closing the socket (as done in Stop) will cause recvfrom to return error
+    
+    char buffer[2048];
+    while (is_running) {
+        sockaddr_in client_addr{};
+#ifdef _WIN32
+        int client_len = sizeof(client_addr);
+#else
+        socklen_t client_len = sizeof(client_addr);
+#endif
+
+        int len = -1;
+#ifdef _WIN32
+        len = recvfrom(static_cast<SOCKET>(socket_fd), buffer, sizeof(buffer), 0, (sockaddr*)&client_addr, &client_len);
+#else
+        len = recvfrom(static_cast<int>(socket_fd), buffer, sizeof(buffer), 0, (sockaddr*)&client_addr, &client_len);
+#endif
+
+        if (!is_running) break;
+
+        if (len > 0) {
+            // Send ACK
+            const char* ack_msg = "ACK";
+#ifdef _WIN32
+            sendto(static_cast<SOCKET>(socket_fd), ack_msg, static_cast<int>(strlen(ack_msg)), 0, (sockaddr*)&client_addr, client_len);
+#else
+            sendto(static_cast<int>(socket_fd), ack_msg, strlen(ack_msg), 0, (sockaddr*)&client_addr, client_len);
+#endif
+        } else {
+             // Error or closed
+             // If we closed the socket in Stop(), this will likely trigger.
+             break;
+        }
+    }
+
+#ifdef _WIN32
+    if (socket_fd != ~0ULL) closesocket(static_cast<SOCKET>(socket_fd));
+    WSACleanup();
+#else
+    if (socket_fd != ~0ULL) close(static_cast<int>(socket_fd));
+#endif
+    socket_fd = ~0ULL;
+    LOG_INFO(Network, "Legacy Online Server stopped");
+}
+
+} // namespace Network

src/core/internal_network/legacy_online.h

@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <atomic>
+#include <cstdint>
+#include <memory>
+#include <thread>
+
+namespace Network {
+
+class LegacyOnlineService {
+public:
+    LegacyOnlineService();
+    ~LegacyOnlineService();
+
+    void Start();
+    void Stop();
+
+private:
+    void ServerLoop();
+
+    std::atomic_bool is_running{false};
+    std::thread worker_thread;
+    uintptr_t socket_fd{~0ULL}; // ~0ULL is approx -1 equivalent for unsigned
+    static constexpr int PORT = 6000;
+};
+
+} // namespace Network

src/video_core/host1x/vic.cpp

@@ -107,9 +107,19 @@ void Vic::Execute() {
     auto output_height{config.output_surface_config.out_surface_height + 1};
     output_surface.resize_destructive(output_width * output_height);
 
+    // Initialize the surface with the appropriate black pixel
+    Pixel black_pixel{};
+    if (config.output_surface_config.out_pixel_format == VideoPixelFormat::Y8__V8U8_N420) {
+        // Y=0, U=512, V=512 (10-bit), A=0
+        black_pixel = {0, 512, 512, 0};
+    } else {
+        // R=0, G=0, B=0, A=0
+        black_pixel = {0, 0, 0, 0};
+    }
+    std::fill(output_surface.begin(), output_surface.end(), black_pixel);
+
     if (Settings::values.nvdec_emulation.GetValue() == Settings::NvdecEmulation::Off) [[unlikely]] {
-        // Fill the frame with black, as otherwise they can have random data and be very glitchy.
-        std::fill(output_surface.begin(), output_surface.end(), Pixel{});
+
     } else {
         for (size_t i = 0; i < config.slot_structs.size(); i++) {
             auto& slot_config{config.slot_structs[i]};
@@ -122,7 +132,18 @@ void Vic::Execute() {
                 nvdec_id = frame_queue.VicFindNvdecFdFromOffset(luma_offset);
             }
 
-            if (auto frame = frame_queue.GetFrame(nvdec_id, luma_offset); frame) {
+            auto frame = frame_queue.GetFrame(nvdec_id, luma_offset);
+            if (!frame) {
+                // We might've failed to find the frame, or the nvdec id is stale/wrong.
+                // Try to find the nvdec id again.
+                const s32 new_id = frame_queue.VicFindNvdecFdFromOffset(luma_offset);
+                if (new_id != -1) {
+                    nvdec_id = new_id;
+                    frame = frame_queue.GetFrame(nvdec_id, luma_offset);
+                }
+            }
+
+            if (frame) {
                 if (frame.get()) {
                     switch (frame->GetPixelFormat()) {
                     case AV_PIX_FMT_YUV420P:
@@ -170,6 +191,7 @@ void Vic::ReadProgressiveY8__V8U8_N420(const SlotStruct& slot, std::span<const P
     }
 
     slot_surface.resize_destructive(out_luma_width * out_luma_height);
+    std::fill(slot_surface.begin(), slot_surface.end(), Pixel{0, 512, 512, 0});
 
     const auto in_luma_width{(std::min)(frame->GetWidth(), s32(out_luma_width))};
     const auto in_luma_height{(std::min)(frame->GetHeight(), s32(out_luma_height))};
@@ -219,6 +241,7 @@ void Vic::ReadInterlacedY8__V8U8_N420(const SlotStruct& slot, std::span<const Pl
     const auto out_luma_stride{out_luma_width};
 
     slot_surface.resize_destructive(out_luma_width * out_luma_height);
+    std::fill(slot_surface.begin(), slot_surface.end(), Pixel{0, 512, 512, 0});
 
     const auto in_luma_width{(std::min)(frame->GetWidth(), s32(out_luma_width))};
     [[maybe_unused]] const auto in_luma_height{