determine the size of Stage 2 automatically.

stage1/stage1_lba.S

@@ -19,7 +19,8 @@
  */
 
 #include <stage1.h>
-	
+#include <stage2_size.h>
+		
 /*
  *  defines for the code go here
  */
@@ -345,7 +346,8 @@ lastlist:
 #else
 	.long 1		/* this is the sector start parameter, in logical
 			   sectors from the start of the disk, sector 0 */
-	.word 130	/* this is the number of sectors to read */
+			/* this is the number of sectors to read */
+	.word (STAGE2_SIZE + 511) / 512
 	.word 0x0800	/* this is the segment of the starting address
 			   to load the data into */
 #endif