diff --git a/Sts1CobcSw/FileSystem/CMakeLists.txt b/Sts1CobcSw/FileSystem/CMakeLists.txt
index 87576075..63e4ddac 100644
--- a/Sts1CobcSw/FileSystem/CMakeLists.txt
+++ b/Sts1CobcSw/FileSystem/CMakeLists.txt
@@ -9,4 +9,5 @@ if(CMAKE_SYSTEM_NAME STREQUAL Generic)
     target_link_libraries(Sts1CobcSw_FileSystem PRIVATE rodos::rodos Sts1CobcSw_Periphery)
 else()
     target_sources(Sts1CobcSw_FileSystem PRIVATE LfsRam.cpp)
+    target_link_libraries(Sts1CobcSw_FileSystem PRIVATE rodos::without_main_on_linux)
 endif()
diff --git a/Sts1CobcSw/FileSystem/LfsFlash.cpp b/Sts1CobcSw/FileSystem/LfsFlash.cpp
index 20b0508e..02f4c133 100644
--- a/Sts1CobcSw/FileSystem/LfsFlash.cpp
+++ b/Sts1CobcSw/FileSystem/LfsFlash.cpp
@@ -5,6 +5,7 @@
 #include <Sts1CobcSw/Periphery/Flash.hpp>
 #include <Sts1CobcSw/Serial/Byte.hpp>
 
+#include <rodos/api/rodos-semaphore.h>
 #include <rodos_no_using_namespace.h>
 
 #include <algorithm>
@@ -30,6 +31,12 @@ auto Lock(lfs_config const * config) -> int;
 auto Unlock(lfs_config const * config) -> int;
 
 
+// TODO: Test with real HW
+// max. 3.5 ms acc. W25Q01JV datasheet
+constexpr auto pageProgramTimeout = 5 * RODOS::MILLISECONDS;
+// max. 400 ms acc. W25Q01JV datasheet (lfs_config.block_size = flash::sectorSize)
+constexpr auto blockEraseTimeout = 500 * RODOS::MILLISECONDS;
+
 auto readBuffer = std::array<Byte, lfsCacheSize>{};
 auto programBuffer = decltype(readBuffer){};
 auto lookaheadBuffer = std::array<Byte, 64>{};  // NOLINT(*magic-numbers)
@@ -63,11 +70,7 @@ lfs_config const lfsConfig = lfs_config{.context = nullptr,
                                         .metadata_max = flash::sectorSize,
                                         .inline_max = 0};
 
-// TODO: Test with real HW
-// max. 3.5 ms acc. W25Q01JV datasheet
-constexpr auto pageProgramTimeout = 5 * RODOS::MILLISECONDS;
-// max. 400 ms acc. W25Q01JV datasheet (lfs_config.block_size = flash::sectorSize)
-constexpr auto blockEraseTimeout = 500 * RODOS::MILLISECONDS;
+auto semaphore = RODOS::Semaphore();
 
 
 auto Initialize() -> void
@@ -141,16 +144,16 @@ auto Sync([[maybe_unused]] lfs_config const * config) -> int
 }
 
 
-// TODO: Add a proper implementation
 auto Lock([[maybe_unused]] lfs_config const * config) -> int
 {
+    semaphore.enter();
     return 0;
 }
 
 
-// TODO: Add a proper implementation
 auto Unlock([[maybe_unused]] lfs_config const * config) -> int
 {
+    semaphore.leave();
     return 0;
 }
 }
diff --git a/Sts1CobcSw/FileSystem/LfsRam.cpp b/Sts1CobcSw/FileSystem/LfsRam.cpp
index f06aa423..f42cb3ca 100644
--- a/Sts1CobcSw/FileSystem/LfsRam.cpp
+++ b/Sts1CobcSw/FileSystem/LfsRam.cpp
@@ -6,6 +6,8 @@
 #include <Sts1CobcSw/FileSystem/LfsMemoryDevice.hpp>  // IWYU pragma: associated
 #include <Sts1CobcSw/Serial/Byte.hpp>
 
+#include <rodos/api/rodos-semaphore.h>
+
 #include <algorithm>
 #include <array>
 #include <vector>
@@ -68,6 +70,8 @@ lfs_config const lfsConfig = lfs_config{.context = nullptr,
                                         .metadata_max = sectorSize,
                                         .inline_max = 0};
 
+auto semaphore = RODOS::Semaphore();
+
 
 auto Initialize() -> void
 {
@@ -112,16 +116,16 @@ auto Sync([[maybe_unused]] lfs_config const * config) -> int
 }
 
 
-// TODO: Add a proper implementation
 auto Lock([[maybe_unused]] lfs_config const * config) -> int
 {
+    semaphore.enter();
     return 0;
 }
 
 
-// TODO: Add a proper implementation
 auto Unlock([[maybe_unused]] lfs_config const * config) -> int
 {
+    semaphore.leave();
     return 0;
 }
 }
diff --git a/Tests/UnitTests/CMakeLists.txt b/Tests/UnitTests/CMakeLists.txt
index 4ed583c3..1b7b56f5 100644
--- a/Tests/UnitTests/CMakeLists.txt
+++ b/Tests/UnitTests/CMakeLists.txt
@@ -14,11 +14,6 @@ target_link_libraries(
                                  Sts1CobcSw_Utility
 )
 
-add_program(LfsRam LfsRam.test.cpp)
-target_link_libraries(
-    Sts1CobcSwTests_LfsRam PRIVATE Catch2::Catch2WithMain littlefs::littlefs Sts1CobcSw_FileSystem
-)
-
 add_program(MajorityVote MajorityVote.test.cpp)
 target_link_libraries(
     Sts1CobcSwTests_MajorityVote PRIVATE Catch2::Catch2WithMain Sts1CobcSw_Utility
@@ -86,6 +81,11 @@ target_link_libraries(
 )
 add_test(NAME FramRingArray COMMAND Sts1CobcSwTests_FramRingArray)
 
+add_program(LfsRam LfsRam.test.cpp UnitTestThread.cpp)
+target_link_libraries(
+    Sts1CobcSwTests_LfsRam PRIVATE rodos::rodos littlefs::littlefs Sts1CobcSw_FileSystem
+)
+
 add_program(LfsWrapper LfsWrapper.test.cpp UnitTestThread.cpp)
 target_link_libraries(
     Sts1CobcSwTests_LfsWrapper PRIVATE rodos::rodos littlefs::littlefs Sts1CobcSw_FileSystem
diff --git a/Tests/UnitTests/LfsRam.test.cpp b/Tests/UnitTests/LfsRam.test.cpp
index 42da8b06..1f42af58 100644
--- a/Tests/UnitTests/LfsRam.test.cpp
+++ b/Tests/UnitTests/LfsRam.test.cpp
@@ -1,47 +1,47 @@
-#include <Sts1CobcSw/FileSystem/LfsMemoryDevice.hpp>
+#include <Tests/UnitTests/UnitTestThread.hpp>
 
-#include <catch2/catch_test_macros.hpp>
+#include <Sts1CobcSw/FileSystem/LfsMemoryDevice.hpp>
 
 #include <littlefs/lfs.h>
 
 
-TEST_CASE("RAM memory device")
+auto RunUnitTest() -> void
 {
     sts1cobcsw::fs::Initialize();
     auto lfs = lfs_t{};
     auto errorCode = lfs_format(&lfs, &sts1cobcsw::fs::lfsConfig);
-    REQUIRE(errorCode == 0);
+    Require(errorCode == 0);
     errorCode = lfs_mount(&lfs, &sts1cobcsw::fs::lfsConfig);
-    REQUIRE(errorCode == 0);
+    Require(errorCode == 0);
 
     auto const * directoryPath = "MyFolder";
     errorCode = lfs_mkdir(&lfs, directoryPath);
-    REQUIRE(errorCode == 0);
+    Require(errorCode == 0);
 
     auto const * filePath = "MyFolder/MyFile";
     auto file = lfs_file_t{};
     errorCode = lfs_file_open(&lfs, &file, filePath, LFS_O_WRONLY | LFS_O_CREAT);
-    REQUIRE(errorCode == 0);
+    Require(errorCode == 0);
 
     int number = 123;
     errorCode = lfs_file_write(&lfs, &file, &number, sizeof(number));
-    REQUIRE(errorCode == sizeof(number));
+    Require(errorCode == sizeof(number));
 
     errorCode = lfs_file_close(&lfs, &file);
-    REQUIRE(errorCode == 0);
+    Require(errorCode == 0);
     errorCode = lfs_unmount(&lfs);
-    REQUIRE(errorCode == 0);
+    Require(errorCode == 0);
 
     errorCode = lfs_mount(&lfs, &sts1cobcsw::fs::lfsConfig);
-    REQUIRE(errorCode == 0);
+    Require(errorCode == 0);
     errorCode = lfs_file_open(&lfs, &file, filePath, LFS_O_RDONLY);
-    REQUIRE(errorCode == 0);
+    Require(errorCode == 0);
 
     int readNumber = 0;
     errorCode = lfs_file_read(&lfs, &file, &readNumber, sizeof(number));
-    REQUIRE(errorCode == sizeof(number));
-    REQUIRE(readNumber == number);
+    Require(errorCode == sizeof(number));
+    Require(readNumber == number);
 
     errorCode = lfs_file_close(&lfs, &file);
-    REQUIRE(errorCode == 0);
+    Require(errorCode == 0);
 }
diff --git a/Tests/UnitTests/LfsWrapper.test.cpp b/Tests/UnitTests/LfsWrapper.test.cpp
index 1204fb9e..a78f49c4 100644
--- a/Tests/UnitTests/LfsWrapper.test.cpp
+++ b/Tests/UnitTests/LfsWrapper.test.cpp
@@ -13,6 +13,7 @@
 #include <algorithm>
 #include <array>
 
+
 using sts1cobcsw::Byte;
 using sts1cobcsw::Span;
 using sts1cobcsw::fs::Path;