diff --git a/include/io/spkr.h b/include/io/spkr.h
index 760928a..e1f8514 100644
--- a/include/io/spkr.h
+++ b/include/io/spkr.h
@@ -38,6 +38,12 @@ void IoDoBeepNoIdt(void);
 
 void IoDoStarWars(void);
 
+struct Note
+{
+        uint tone;
+        uint time;
+};
+
 //----------------------------------------------------------------------------//
 
 #endif
diff --git a/kaleid/kernel/io/spkr.c b/kaleid/kernel/io/spkr.c
index 74488e9..c2a4fce 100644
--- a/kaleid/kernel/io/spkr.c
+++ b/kaleid/kernel/io/spkr.c
@@ -28,6 +28,18 @@
 
 extern bool KeIdtIsInitialized;
 
+const struct Note score[40] = { {440, 200}, {110, 200}, {440, 200}, {110, 200},
+                            {440, 200}, {110, 200}, {349, 140}, {87, 100},
+                            {523, 60},  {87, 100},  {440, 200}, {110, 200},
+                            {349, 140}, {87, 100},  {523, 60},  {87, 100},
+                            {440, 200}, {110, 200}, {440, 200}, {110, 200},
+                            {659, 200}, {110, 200}, {659, 200}, {110, 200},
+                            {659, 200}, {87, 200},  {698, 140}, {87, 100},
+                            {523, 60},  {87, 100},  {415, 200}, {87, 200},
+                            {349, 140}, {87, 100},  {523, 60},  {87, 100},
+                            {440, 200}, {110, 200}, {110, 200}, {110, 200}
+};
+
 void IoStartSpeaker(int freq)
 {
     uchar temp;
@@ -81,28 +93,10 @@ void IoDoBeepNoIdt(void)
 
 void IoDoStarWars(void)
 {
-    struct Note {
-        uint tone;
-        uint time;
-    };
-
-    const struct Note score[40] = { {440, 200}, {110, 200}, {440, 200}, {110, 200},
-                            {440, 200}, {110, 200}, {349, 140}, {87, 100},
-                            {523, 60},  {87, 100},  {440, 200}, {110, 200},
-                            {349, 140}, {87, 100},  {523, 60},  {87, 100},
-                            {440, 200}, {110, 200}, {440, 200}, {110, 200},
-                            {659, 200}, {110, 200}, {659, 200}, {110, 200},
-                            {659, 200}, {87, 200},  {698, 140}, {87, 100},
-                            {523, 60},  {87, 100},  {415, 200}, {87, 200},
-                            {349, 140}, {87, 100},  {523, 60},  {87, 100},
-                            {440, 200}, {110, 200}, {110, 200}, {110, 200}
-                          };
-
-    bprintf(BStdOut, "Address of the score : %p\n", &score[37]);
-
     for (uint i = 0; i < 40; i++) {
         //IoDoTone(score[i].tone, score[i].time);
-        bprintf(BStdOut, "%d ", score[i].time);
+        bprintf(BStdOut, "At %p : %u\n", &(score[i].tone), score[i].tone);
+        bprintf(BStdOut, "At %p : %u\n", &(score[i].time), score[i].time);
         BStdOut->flusher(BStdOut);
     }
     IoQuietSpeaker();
diff --git a/kaleid/kernel/mm/paging.c b/kaleid/kernel/mm/paging.c
index a244181..a513d3a 100644
--- a/kaleid/kernel/mm/paging.c
+++ b/kaleid/kernel/mm/paging.c
@@ -83,17 +83,17 @@ void MmInitPaging(void)
 
         // RODATA
         if ((ulong)(i*KPAGESIZE) >= (ulong)&_rodata && (ulong)(i*KPAGESIZE) <= (ulong)&_rodata_end) {
-            MmPT[i] = ((ulong)(i*KPAGESIZE)) | MF_PRESENT;
+            MmPT[i] = ((ulong)(i*KPAGESIZE)) | MF_PRESENT | MF_WRITETHR;
             continue;
         }
 
         // DATA
         if ((ulong)(i*KPAGESIZE) >= (ulong)&_data && (ulong)(i*KPAGESIZE) <= (ulong)&_data_end) {
-            MmPT[i] = ((ulong)(i*KPAGESIZE)) | MF_PRESENT | MF_READWRITE;
+            MmPT[i] = ((ulong)(i*KPAGESIZE)) | MF_PRESENT | MF_WRITETHR | MF_READWRITE;
             continue;
         }
 
-        MmPT[i] = ((ulong)(i*KPAGESIZE)) | MF_PRESENT | MF_READWRITE;
+        MmPT[i] = ((ulong)(i*KPAGESIZE)) | MF_PRESENT | MF_WRITETHR | MF_READWRITE;
     }
 
     for (volatile ulong i = 0; i <  NB_4K; i++) {
@@ -117,10 +117,9 @@ void MmInitPaging(void)
     MmPML4[0] = (ulong)(&MmPDP[0])| MF_PRESENT | MF_READWRITE;
 
     MmLoadPML4((void *)MmPML4);
-    /* DebugLog("Read only : %p\n", (ulong)&_text); */
-    /* DebugLog("Read only : %p\n", (ulong)&_text_end); */
-    /* DebugLog("Read only : %p\n", (ulong)&_rodata); */
-    /* DebugLog("Read only : %p\n", (ulong)&_rodata_end); */
+    MmEnableWriteProtect();
+    DebugLog("\tPage RO from %p to %p\n", (ulong)&_text, (ulong)&_text_end);
+    DebugLog("\tPage RO from %p to %p\n", (ulong)&_rodata, (ulong)&_rodata_end);
     //DebugLog("\tPaging tables initialized at %p, %p\n", &MmPD, &MmPT);
     //DebugLog("\tStack Guards at %p, %p\n", MmStackGuards[0], MmStackGuards[1]);
 }
diff --git a/kaleid/kernel/sh/testcmds.c b/kaleid/kernel/sh/testcmds.c
index 8b9cb66..9a8732b 100644
--- a/kaleid/kernel/sh/testcmds.c
+++ b/kaleid/kernel/sh/testcmds.c
@@ -155,11 +155,13 @@ error_t CmdHelpTest(int argc, char **argv, char *cmdline)
 
 error_t CmdPF(int argc, char **argv, char *cmdline)
 {
-    char *address = (void*)(ulong)atoi(argv[1]);
+    ulong *address = (ulong*)(ulong)atoi(argv[1]);
 
     KernLog("Provoking Page Fault at %#x\n", address);
 
+    KernLog("It contained %#x\n", *address);
     *address = 1;
+    KernLog("Now it contains %#x\n", *address);
 
     KernLog("No page fault : address was valid/present\n");
 
@@ -203,6 +205,26 @@ error_t CmdTimerTest(int argc, char **argv, char *cmdline)
     return EOK;
 }
 
+error_t CmdprintfTest(int argc, char **argv, char *cmdline)
+{
+    /* bprintf(BStdOut, "INT_MIN : %u\n", INT_MIN); */
+    /* BStdOut->flusher(BStdOut); */
+    bprintf(BStdOut, "INT_MAX : %u\n", INT_MAX);
+    BStdOut->flusher(BStdOut);
+
+    int n = - 5;
+
+    for (int i=INT_MAX - 5; n < 10; i++) {
+        bprintf(BStdOut, "INT_MAX + %d : %d\n", n, i);
+        BStdOut->flusher(BStdOut);
+        n++;
+    }
+
+    KernLog("Finished !\n");
+
+    return EOK;
+}
+
 static Command_t testcmdtable[] =
 {
     { "args",       CmdArgs,           "Print command line"                   },
@@ -215,5 +237,6 @@ static Command_t testcmdtable[] =
     { "stkov",      CmdStackOverflow,  "Provoke a stack overflow"             },
     { "stkun",      CmdStackUnderflow, "Provoke a stack underflow"            },
     { "timer",      CmdTimerTest,      "test timer of x ms"                   },
+    { "printf",      CmdprintfTest,      "test timer of x ms"                   },
     { NULL, NULL, NULL }
 };