2 files changed, 14 insertions, 2 deletions
diff --git a/src/include/ipxe/null_sanboot.h b/src/include/ipxe/null_sanboot.h
index 341a9a1d2..2b3a2c74d 100644
--- a/src/include/ipxe/null_sanboot.h
+++ b/src/include/ipxe/null_sanboot.h
@@ -15,4 +15,9 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #define SANBOOT_PREFIX_null __null_
 #endif
 
+static inline __always_inline unsigned int
+SANBOOT_INLINE ( null, san_default_drive ) ( void ) {
+	return 0;
+}
+
 #endif /* _IPXE_NULL_SANBOOT_H */
diff --git a/src/include/ipxe/sanboot.h b/src/include/ipxe/sanboot.h
index 913282eb5..14c8a5da4 100644
--- a/src/include/ipxe/sanboot.h
+++ b/src/include/ipxe/sanboot.h
@@ -59,11 +59,18 @@ struct uri;
 #include <bits/sanboot.h>
 
 /**
+ * Get default SAN drive number
+ *
+ * @ret drive		Default drive number
+ */
+unsigned int san_default_drive ( void );
+
+/**
  * Hook SAN device
  *
  * @v uri		URI
- * @v drive		Requested drive number
- * @ret drive		Assigned drive number, or negative error
+ * @v drive		Drive number
+ * @ret rc		Return status code
  */
 int san_hook ( struct uri *uri, unsigned int drive );