diff --git a/doc/LPCXPresso_Flash_Debug_Tutorial.odt b/doc/LPCXPresso_Flash_Debug_Tutorial.odt
new file mode 100644
index 00000000..fe9dca9a
Binary files /dev/null and b/doc/LPCXPresso_Flash_Debug_Tutorial.odt differ
diff --git a/doc/LPCXPresso_Flash_Debug_Tutorial.pdf b/doc/LPCXPresso_Flash_Debug_Tutorial.pdf
new file mode 100644
index 00000000..a00c5a5a
Binary files /dev/null and b/doc/LPCXPresso_Flash_Debug_Tutorial.pdf differ
diff --git a/firmware/common/LPC4330_M4_ROM_to_RAM.ld b/firmware/common/LPC4330_M4_ROM_to_RAM.ld
index f2850b91..e3852933 100644
--- a/firmware/common/LPC4330_M4_ROM_to_RAM.ld
+++ b/firmware/common/LPC4330_M4_ROM_to_RAM.ld
@@ -29,7 +29,8 @@ MEMORY
 	/* rom is really the shadow region that points to SPI flash or elsewhere */
 	rom (rx)  : ORIGIN = 0x00000000, LENGTH =  1M
 	ram (rwx) : ORIGIN = 0x10000000, LENGTH =  128K
-	/* there are some additional RAM regions */
+	/* there are some additional RAM regions for data */
+	ram_data (rw) : ORIGIN = 0x10080000, LENGTH =  72K
 }
 
 /* Include the common ld script. */
diff --git a/firmware/startup_systick/startup_systick.c b/firmware/startup_systick/startup_systick.c
index b80a1b59..ab7cd9fd 100644
--- a/firmware/startup_systick/startup_systick.c
+++ b/firmware/startup_systick/startup_systick.c
@@ -275,7 +275,7 @@ u32 test_nb_instruction_per_sec(void)
 		asm volatile ("nop ");
 		asm volatile ("nop ");
 		asm volatile ("nop ");
-		nb_instructions_per_sec += 100;
+		nb_instructions_per_sec += 108;
 
         end = sys_tick_get_time_ms();
         tickms = sys_tick_delta_time_ms(start, end);