diff --git a/src/common.h b/src/common.h
index b295336..ee7d5d8 100644
--- a/src/common.h
+++ b/src/common.h
@@ -11,6 +11,7 @@ extern "C" {
 #define OSDynLoad_Acquire ((void (*)(char* rpl, unsigned int *handle))0x0102A3B4)
 #define OSDynLoad_FindExport ((void (*)(unsigned int handle, int isdata, char *symbol, void *address))0x0102B828)
 #define OSFatal ((void (*)(char* msg))0x01031618)
+#define __os_snprintf ((int(*)(char* s, int n, const char * format, ... ))0x0102F160)
 
 #define ADDRESS_OSTitle_main_entry_ptr              0x1005E040
 #define ADDRESS_main_entry_hook                     0x0101c56c
diff --git a/src/elf_loading.c b/src/elf_loading.c
index 442756c..b8875aa 100644
--- a/src/elf_loading.c
+++ b/src/elf_loading.c
@@ -29,16 +29,18 @@ static int32_t LoadFileToMem(private_data_t *private_data, const char *filepath,
 
         int32_t status = private_data->FSGetMountSource(pClient, pCmd, 0, tempPath, -1);
         if (status != 0) {
-            OSFatal("FSGetMountSource failed.");
+            OSFatal("FSGetMountSource failed. Please insert a FAT32 formatted sd card.");
         }
         status = private_data->FSMount(pClient, pCmd, tempPath, mountPath, FS_MAX_MOUNTPATH_SIZE, -1);
         if(status != 0) {
-            OSFatal("SD mount failed.");
+            OSFatal("SD mount failed. Please insert a FAT32 formatted sd card.");
         }
 
         status = private_data->FSOpenFile(pClient, pCmd, filepath, "r", &iFd, -1);
         if(status != 0) {
-            OSFatal("FSOpenFile failed.");
+            char buf[0x255];
+            __os_snprintf(buf,0x254,"FSOpenFile failed. File missing %s",filepath);            
+            OSFatal(buf);
         }
 
         FSStat stat;
diff --git a/src/memory_setup.c b/src/memory_setup.c
index b00fcb1..03d3005 100644
--- a/src/memory_setup.c
+++ b/src/memory_setup.c
@@ -9,14 +9,14 @@ static void SCSetupIBAT4DBAT5() {
     asm volatile("eieio; isync");
 
     // Give our and the kernel full execution rights.
-    // VA: 00000000..00800000 PA: 30000000..30800000  with r/w for user and supervisor
+    // 00800000-01000000 => 30800000-31000000 (read/write, user/supervisor)
     unsigned int ibat4u = 0x008000FF;
     unsigned int ibat4l = 0x30800012;
     asm volatile("mtspr 560, %0" : : "r" (ibat4u));
     asm volatile("mtspr 561, %0" : : "r" (ibat4l));
 
     // Give our and the kernel full data access rights.
-    // VA: 00000000..00800000 PA: 30000000..30800000  with r/w for user and supervisor
+    // 00800000-01000000 => 30800000-31000000 (read/write, user/supervisor)
     unsigned int dbat5u = ibat4u;
     unsigned int dbat5l = ibat4l;
     asm volatile("mtspr 570, %0" : : "r" (dbat5u));