diff --git a/Makefile b/Makefile
index 0c75b9e..4d47d3b 100644
--- a/Makefile
+++ b/Makefile
@@ -165,13 +165,13 @@ $(KOBJDIR)/kernel/malloc.o: $(KERNELDIR)/kernel/mm/malloc.c
 ./ProjectTree: ./.stylehlp_sh
 	@cat ./.stylehlp_sh > ./ProjectTree
 	@echo "\n" >> ./ProjectTree
-	@tree >> ./ProjectTree
+	@tree --dirsfirst >> ./ProjectTree
 	@echo ${CL2}[$@] ${CL}Generated.${CL3}
 ## MAIN MAKEFILE ------------------------------------------------------------- #
 
 .PHONY: test
 test: all
-	@qemu-system-x86_64 -hda build/bin/disk.img -d cpu_reset,guest_errors,pcall,int -enable-kvm 2> qemu.log &
+	@qemu-system-x86_64 -m 5G -hda build/bin/disk.img -d cpu_reset,guest_errors,pcall,int -enable-kvm 2> qemu.log &
 	@ndisasm $(BINDIR)/kaleid -o 0x00100000 -b 64 > loader_disasm64.asm
 	@ndisasm $(BINDIR)/kaleid -o 0x00100000 -b 32 > loader_disasm32.asm
 .PHONY: test32
@@ -182,7 +182,7 @@ test32: all
 
 .PHONY: debug
 debug: all
-	@qemu-system-x86_64 -hda build/bin/disk.img -d cpu_reset,guest_errors,pcall,int -s -S -enable-kvm 2> qemu.log &
+	@qemu-system-x86_64 -m 5G -hda build/bin/disk.img -d cpu_reset,guest_errors,pcall,int -s -S -enable-kvm 2> qemu.log &
 	@ndisasm $(BINDIR)/kaleid -o 0x00100000 -b 64 > loader_disasm64.asm
 	@ndisasm $(BINDIR)/kaleid -o 0x00100000 -b 32 > loader_disasm32.asm
 
diff --git a/boot/loader/loader.asm b/boot/loader/loader.asm
index 8e39fa7..8441366 100644
--- a/boot/loader/loader.asm
+++ b/boot/loader/loader.asm
@@ -154,6 +154,7 @@ _loader64:
     call write
 
     ;; Launch the kernel !
+    ;; XXX CHECK THE RAM BEFORE CALLING KERNEL !
     call tritemporize                   ; Let time to see
 
     mov rdi, [mbInfo]
diff --git a/kaleid/include/kernel/base.h b/kaleid/include/kernel/base.h
index 476c647..9b9ed11 100644
--- a/kaleid/include/kernel/base.h
+++ b/kaleid/include/kernel/base.h
@@ -102,33 +102,42 @@ struct BootInfo_t
 {
     // The Bootloader infos (GRUB in our case)
     struct {
+        ushort valid;
         uint grubFlags;         //flags
         uint modulesCount;      //mods_count
         void *modulesAddr;      //mods_addr
-        uint grubName;          //boot_loader_name
+        char *grubName;         //boot_loader_name
         void *mbHeaderAddr;
     } btldr;
 
     // Informations about drives
     struct {
+        ushort drvValid;
+        ushort bufferValid;
         uint bootDrv;           //boot_device
         uint bufferLength;      //drives_length
-        void *bufferAddr;        //drives_addr
+        void *bufferAddr;       //drives_addr
     } drives;
 
     // Informations about memory
     struct {
+        ushort memValid;
+        ushort mapValid;
+
         //BIOS provided low and up memory
         uint lowMemory;         //mem_lower
         uint upMemory;          //mem_upper
 
         //GRUB provided memory map
         uint mapLength;         //mmap_length
-        void *mapAddr;           //mmap_addr
+        void *mapAddr;          //mmap_addr
+
+        uint ramSize;           //The ram (init by map.c)
     } memory;
 
      // Informations about the video drive
     struct {
+        ushort valid;
         uint vbeControl;        //vbe_control_info
         uint vbeModeInfo;       //vbe_mode_info
         ushort vbeMode;         //vbe_mode
@@ -145,6 +154,8 @@ struct BootInfo_t
 
      // Informations about the microcode firmware (BIOS/EFI)
     struct {
+        ushort apmValid;
+        ushort romValid;
         uint apmTable;          //apm_table
         uint romTable;          //config_table
     } firmware;
diff --git a/kaleid/include/kernel/mm.h b/kaleid/include/kernel/mm.h
index 3ef8494..49072e0 100644
--- a/kaleid/include/kernel/mm.h
+++ b/kaleid/include/kernel/mm.h
@@ -25,6 +25,8 @@
 #include <kernel/multiboot.h>
 #include <kernel/base.h>
 
+#define MINIMUM_RAM_SIZE 16    //Mio, the minimum RAM size.
+
 //
 // Returns a pointer to the first entry of the memory map
 //
diff --git a/kaleid/kernel/init/init.c b/kaleid/kernel/init/init.c
index 4c0b168..998ae3b 100644
--- a/kaleid/kernel/init/init.c
+++ b/kaleid/kernel/init/init.c
@@ -29,7 +29,7 @@
 
 //
 // BootInfo_t initialization. It is necessary because grub will potentially be
-//  wiped since it is below 1MB....
+//  wiped since it is below 1MB.... And we must reorganize all that stuff.
 //
 void InitBootInfo(multiboot_info_t *mbi)
 {
@@ -37,41 +37,69 @@ void InitBootInfo(multiboot_info_t *mbi)
     KalAlwaysAssert(mbi);
     extern uint MB_header;
 
-    //Retrieves the bootloader informations
-    GetBootInfo(btldr).grubFlags       = mbi->flags;
-    GetBootInfo(btldr).grubName        = (mbi->boot_loader_name);
-    GetBootInfo(btldr).modulesCount    = mbi->mods_count;
-    GetBootInfo(btldr).modulesAddr     = (void*)(ullong)mbi->mods_addr;
-    GetBootInfo(btldr).mbHeaderAddr    = (void*)(ullong)&MB_header;
-    DebugLog("\n[InitBootInfo] %s\n", GetBootInfo(btldr).grubName);
-    DebugLog("[InitBootInfo] Header address : %p, modules address : %p\n",
-              GetBootInfo(btldr).mbHeaderAddr, GetBootInfo(btldr).modulesAddr);
-    DebugLog("[InitBootInfo] GRUB flags : %x\n", GetBootInfo(btldr).grubFlags);
+    //Retrieves the bootloader flags to ensure infos are valid
+    GetBootInfo(btldr).grubFlags            = mbi->flags;
 
+    if (
+        (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_BOOT_LOADER_NAME) == MULTIBOOT_INFO_BOOT_LOADER_NAME &&
+        (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_MODS) == MULTIBOOT_INFO_MODS
+        ) {
+        GetBootInfo(btldr).grubName         = (char*)(ullong)(mbi->boot_loader_name);
+        GetBootInfo(btldr).modulesCount     = mbi->mods_count;
+        GetBootInfo(btldr).modulesAddr      = (void*)(ullong)mbi->mods_addr;
+        GetBootInfo(btldr).mbHeaderAddr     = (void*)(ullong)&MB_header;
+        GetBootInfo(btldr).valid            = 1;
+    }
     //Retrieves the drives informations
-    GetBootInfo(drives).bootDrv        = mbi->boot_device;
-    GetBootInfo(drives).bufferLength   = mbi->drives_length;
-    GetBootInfo(drives).bufferAddr     = (void*)(ullong)mbi->drives_addr;
-    DebugLog("[InitBootInfo] Root drive : %x\n",
-             GetBootInfo(drives).bootDrv);
+    if ((GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_DRIVE_INFO) == MULTIBOOT_INFO_DRIVE_INFO) {
+        GetBootInfo(drives).bufferLength    = mbi->drives_length;
+        GetBootInfo(drives).bufferAddr      = (void*)(ullong)mbi->drives_addr;
+        GetBootInfo(drives).bufferValid     = 1;
+    }
+    if ((GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_BOOTDEV) == MULTIBOOT_INFO_BOOTDEV) {
+        GetBootInfo(drives).bootDrv         = mbi->boot_device;
+        GetBootInfo(drives).drvValid        = 1;
+    }
 
     //Retrieves the memory informations
-    GetBootInfo(memory).lowMemory       = mbi->mem_lower;
-    GetBootInfo(memory).upMemory        = mbi->mem_upper;
-    GetBootInfo(memory).mapAddr         = (void*)(ullong)mbi->mmap_addr;
-    GetBootInfo(memory).mapLength       = mbi->mmap_length;
-    DebugLog("[InitBootInfo] Low memory : %d Kio, Up memory : %d Mio\n",
-             GetBootInfo(memory).lowMemory, GetBootInfo(memory).upMemory / (MB/KB));
-    DebugLog("[InitBootInfo] Memory map address : %p, length : %d\n",
-             GetBootInfo(memory).mapAddr, GetBootInfo(memory).mapLength);
+    if ((GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_MEMORY) == MULTIBOOT_INFO_MEMORY) {
+        GetBootInfo(memory).lowMemory       = mbi->mem_lower;
+        GetBootInfo(memory).upMemory        = mbi->mem_upper;
+        GetBootInfo(memory).memValid        = 1;
+    }
+    if ((GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_MEM_MAP) == MULTIBOOT_INFO_MEM_MAP) {
+        GetBootInfo(memory).mapAddr         = (void*)(ullong)mbi->mmap_addr;
+        GetBootInfo(memory).mapLength       = mbi->mmap_length;
+        GetBootInfo(memory).mapValid        = 1;
+    }
 
     // XXX assign video infos, but unused at this time
 
     // Retrieves the firmware infos
-    GetBootInfo(firmware).apmTable      = mbi->apm_table;
-    GetBootInfo(firmware).romTable      = mbi->config_table;
-    DebugLog("[InitBootInfo] APM Table : %p, ROM Table : %p\n",
-             GetBootInfo(firmware).apmTable, GetBootInfo(firmware).romTable);
+    if ((GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_CONFIG_TABLE) == MULTIBOOT_INFO_CONFIG_TABLE) {
+        GetBootInfo(firmware).romTable      = mbi->config_table;
+        GetBootInfo(firmware).romValid      = 1;
+    }
+    if ((GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_APM_TABLE ) == MULTIBOOT_INFO_APM_TABLE ) {
+        GetBootInfo(firmware).apmTable      = mbi->apm_table;
+        GetBootInfo(firmware).apmValid      = 1;
+    }
+
+    //Now we check (debug)
+    DebugLog("\n[InitBootInfo] Boot loader  %s",
+             GetBootInfo(btldr).valid ? "OK" : "");
+    DebugLog("\n[InitBootInfo] Boot drive   %s",
+             GetBootInfo(drives).drvValid ? "OK" : "");
+    DebugLog("\n[InitBootInfo] Disk buffer  %s",
+             GetBootInfo(drives).bufferValid ? "OK" : "");
+    DebugLog("\n[InitBootInfo] Basic mem    %s",
+             GetBootInfo(memory).memValid ? "OK" : "");
+    DebugLog("\n[InitBootInfo] Memory map   %s",
+             GetBootInfo(memory).mapValid ? "OK" : "");
+    DebugLog("\n[InitBootInfo] ROM table    %s",
+             GetBootInfo(firmware).romValid ? "OK" : "");
+    DebugLog("\n[InitBootInfo] APM table    %s",
+             GetBootInfo(firmware).apmValid ? "OK\n" : "\n");
 }
 
 
@@ -96,7 +124,9 @@ noreturn void StartKern(multiboot_info_t *mbInfo, int mbMagic)
     InitBootInfo(mbInfo);
 
     //Memory mapping
-    InitMemoryMap();
+    error_t mapBad = InitMemoryMap();
+    if (mapBad)
+        StartPanic("[Init] The memory map failed to initialize. Error : %d", mapBad);
 
     // We're out
     KernLog("\n[Init] Evil never dies !");
diff --git a/kaleid/kernel/mm/map.c b/kaleid/kernel/mm/map.c
index ed39670..5ea56c6 100644
--- a/kaleid/kernel/mm/map.c
+++ b/kaleid/kernel/mm/map.c
@@ -27,8 +27,16 @@
 
 error_t InitMemoryMap(void)
 {
-    uint mapIsValid = (GetBootInfo(btldr).grubFlags & MULTIBOOT_INFO_MEM_MAP) == MULTIBOOT_INFO_MEM_MAP;
-    KalAlwaysAssert(mapIsValid);
+    if (!GetBootInfo(memory).memValid && GetBootInfo(memory).mapValid)
+        return ENXIO;
+    DebugLog("[InitMemoryMap] Memory map address : %p, length : %d\n",
+             GetBootInfo(memory).mapAddr, GetBootInfo(memory).mapLength);
+
+    if ((GetBootInfo(memory).upMemory / (MB/KB)) <= MINIMUM_RAM_SIZE) //XXX before loading kernel... 
+        return ENOMEM;
+    DebugLog("[InitMemoryMap] Low memory : %d Kio, Up memory : %d Mio\n",
+             GetBootInfo(memory).lowMemory, GetBootInfo(memory).upMemory / (MB/KB));
+
     return EOK;
 }