diff --git a/build/kernel.ld b/build/kernel.ld
index 0840bf2..bcc86e2 100644
--- a/build/kernel.ld
+++ b/build/kernel.ld
@@ -38,13 +38,16 @@ SECTIONS {
 
     .text ALIGN (0x1000) :
     {
+    _text = .;
     *(.text)
+    _text_end = .;
     }
 
     .data ALIGN (0x1000) :
     {
     _data = .;
     *(.data)
+    _data_end = .;
     }
 
     .eh_frame ALIGN (0x1000) :
@@ -55,7 +58,9 @@ SECTIONS {
 
     .rodata ALIGN (0x1000) :
     {
+    _rodata = .;
     *(.rodata)
+    _rodata_end = .;
     }
 
     .bss ALIGN (0x1000) :
@@ -70,5 +75,3 @@ SECTIONS {
 
     kernelEnd = .;
 }
-
-
diff --git a/kaleid/kernel/ke/pit.c b/kaleid/kernel/ke/pit.c
index db3bfda..a9d961c 100644
--- a/kaleid/kernel/ke/pit.c
+++ b/kaleid/kernel/ke/pit.c
@@ -37,6 +37,9 @@ static char TimeFmtBuf[22] = { 0 };
 //
 // ISR handler for the Programmable Interval Timer
 //
+
+#pragma GCC push_options
+#pragma GCC optimize ("O0")
 static void HandlePIT(ISRFrame_t *regs)
 {
     Ticks++;
@@ -52,6 +55,7 @@ static void HandlePIT(ISRFrame_t *regs)
         KeSendEOItoPIC(0x28);
     }
 }
+#pragma GCC pop_options
 
 static Timer_t* KeFindTimerBlock(void)
 {
@@ -63,6 +67,8 @@ static Timer_t* KeFindTimerBlock(void)
     return NULL;
 }
 
+#pragma GCC push_options
+#pragma GCC optimize ("O0")
 void KeSleep(uint delay)
 {
     Timer_t *timerBlock;
@@ -77,7 +83,10 @@ void KeSleep(uint delay)
     }
     timerBlock->sema = 0;
 }
+#pragma GCC pop_options
 
+#pragma GCC push_options
+#pragma GCC optimize ("O0")
 Timer_t *KeSetTimer(uint delay)
 {
     Timer_t *timerBlock;
@@ -89,6 +98,7 @@ Timer_t *KeSetTimer(uint delay)
 
     return timerBlock;
 }
+#pragma GCC pop_options
 
 int KeGetTimer(Timer_t *timerBlock)
 {
diff --git a/kaleid/kernel/mm/paging.c b/kaleid/kernel/mm/paging.c
index 2ace42a..843aa87 100644
--- a/kaleid/kernel/mm/paging.c
+++ b/kaleid/kernel/mm/paging.c
@@ -33,6 +33,13 @@ volatile pde_t MmPD[512 * RAM_MAX] __attribute__((__aligned__(KPAGESIZE)));;
 
 volatile pte_t MmPT[512 * NB_4K] __attribute__((__aligned__(KPAGESIZE)));;
 
+extern ulong _text;
+extern ulong _text_end;
+extern ulong _rodata;
+extern ulong _rodata_end;
+extern ulong _data;
+extern ulong _data_end;
+
 ulong MmStackGuards[2] = { 0 };
 
 //
diff --git a/kaleid/kernel/sh/testcmds.c b/kaleid/kernel/sh/testcmds.c
index 70ca0ac..8b9cb66 100644
--- a/kaleid/kernel/sh/testcmds.c
+++ b/kaleid/kernel/sh/testcmds.c
@@ -55,6 +55,19 @@ error_t CmdArgs(int argc, char **argv, char *cmdline)
     return EOK;
 }
 
+error_t CmdAtoi(int argc, char **argv, char *cmdline)
+{
+    int i;
+
+    KernLog("cmdline: '%s'\nargc: %d\n", cmdline, argc);
+
+    for (i = 0; i < argc; i++) {
+        KernLog("argv[%d]: '%u'\n", i, atoi(argv[i]));
+    }
+
+    return EOK;
+}
+
 error_t CmdDumpATASect(int argc, char **argv, char *cmdline)
 {
     char sector[512] = {0};
@@ -193,6 +206,7 @@ error_t CmdTimerTest(int argc, char **argv, char *cmdline)
 static Command_t testcmdtable[] =
 {
     { "args",       CmdArgs,           "Print command line"                   },
+    { "atoi",       CmdAtoi,           "Print command line atoised"           },
     { "dmpsec",     CmdDumpATASect,    "Dump an ATA sector on screen"         },
     { "help",       CmdHelpTest,       "Show this message"                    },
     { "div",        CmdFloatDiv,     "Float div. Usage : div a b. Returns a/b"},