Restructure POST directory to support of other CPUs, boards, etc.
diff --git a/post/post.c b/post/post.c
index e1066da..ac41990 100644
--- a/post/post.c
+++ b/post/post.c
@@ -430,6 +430,7 @@
 #ifdef CONFIG_PPC
 	return (unsigned long)get_ticks () / (get_tbclk () / CFG_HZ) - base;
 #else
+#warning "Not implemented yet"
 	return 0; /* Not implemented yet */
 #endif
 }