diff --git a/TODO b/TODO
index fa01392..bd3bbe9 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,9 @@
 Find out why ubuntu compiles are failing.  Find work around.
 
+Code assumes ebda segment is static - it doesn't read 0x40e.
+
+See if using an ld script for 16bit mode is a good idea.
+
 The __call16 code does a long jump to the interrupt trampolines - this
 is unnecessary.
 
diff --git a/src/post.c b/src/post.c
index e566e83..4666036 100644
--- a/src/post.c
+++ b/src/post.c
@@ -16,7 +16,7 @@
 #define ebda ((struct extended_bios_data_area_s *)(EBDA_SEG<<4))
 #define ipl ((struct ipl_s *)(IPL_SEG<<4))
 
-static int
+static u8
 checksum(u8 *p, u32 len)
 {
     u32 i;
diff --git a/src/romlayout.S b/src/romlayout.S
index ab742d5..4a067e1 100644
--- a/src/romlayout.S
+++ b/src/romlayout.S
@@ -251,7 +251,7 @@
  ****************************************************************/
 
         .macro ENTRY cfunc
-        cli         // In case something far-calls insted of using "int"
+        cli         // In case something far-calls instead of using "int"
         pushal
         pushw %es
         pushw %ds
@@ -404,7 +404,7 @@
         .ascii "06/23/99"
 
         .org 0xfffe
-        // model byte 0xFC = AT
+        // XXX - model byte 0xFC = AT
         .byte 0xfc
         .byte 0x00