Enter unreal mode before printing stage2 banner

Author: Stary2001

Diff for: bios/stage-2/src/main.rs

@@ -39,10 +39,11 @@ pub extern "C" fn _start(disk_number: u16, partition_table_start: *const u8) ->
 }
 
 fn start(disk_number: u16, partition_table_start: *const u8) -> ! {
-    screen::Writer.write_str(" -> SECOND STAGE\n").unwrap();
-
+    // Enter unreal mode before doing anything else.
     enter_unreal_mode();
 
+    screen::Writer.write_str(" -> SECOND STAGE\n").unwrap();
+
     // parse partition table
     let partitions = {
         const MAX_ENTRIES: usize = 4;