Code cleanup; make several boards compile & link.
diff --git a/board/dave/B2/u-boot.lds b/board/dave/B2/u-boot.lds
index d3b6a77..f1bbd5d 100644
--- a/board/dave/B2/u-boot.lds
+++ b/board/dave/B2/u-boot.lds
@@ -51,7 +51,7 @@
 	armboot_end_data = .;
 
 	. = ALIGN(4);
+	__bss_start = .;
 	.bss : { *(.bss) }
-
-	armboot_end = .;
+	_end = .;
 }