diff --git a/src/common/memory.c b/src/common/memory.c
index 0f38a3d..75b6341 100644
--- a/src/common/memory.c
+++ b/src/common/memory.c
@@ -2,14 +2,21 @@
 
 #include <util/atomic.h>
 
-static int   WriteRaw(word addr, byte data);
+#define MEM_SIZE       1024
+#define BLOCK_SIZE     sizeof(mem_data_t)
+#define MAX_BLOCKS     (MEM_SIZE / BLOCK_SIZE)
+#define SENTINEL_MASK  BIT(8)
+
 static byte  ReadRaw(word addr);
+static int   WriteRaw(word addr, byte data);
+static word  GetBlockAddress(void);
 
 int MEM_Read(mem_data_t *out)
 {
 	// TODO
 	UNUSED(out);
 	UNUSED(ReadRaw);
+	UNUSED(GetBlockAddress);
 	return 0;
 }
 
@@ -30,6 +37,11 @@ void MEM_Dump(void)
 	// }
 }
 
+static word GetBlockAddress(void)
+{
+	return 0;
+}
+
 static int WriteRaw(word addr, byte data)
 {
 	// The EEMWE bit determines whether setting EEWE to
diff --git a/src/main.c b/src/main.c
index b753c70..9924207 100644
--- a/src/main.c
+++ b/src/main.c
@@ -6,6 +6,7 @@
 
 #include <avr/interrupt.h>
 
+// TODO: Config header for chip specifics like EEPROM size.
 // TODO: Implement primary state machine for update loop.
 // TODO: Migrate to ATMega 1284P-PU for 2nd 16-bit timer.
 // TODO: Keep persistent TEMP and DEWP targets in EEPROM.