Half boot time on pi when using standalone by using greffs

include/grub/greffs.h

@@ -0,0 +1,55 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_GREFFS_HEADER
+#define GRUB_GREFFS_HEADER	1
+
+#include <grub/types.h>
+
+/*
+  Layout:
+  header
+  grub_uint32_t[] pointers to names
+  inodes
+  names
+  contents.
+  Everything is little-endian.
+ */
+
+struct grub_greffs_header
+{
+  char magic[4];
+#define GRUB_GREFFS_MAGIC "gref"
+  grub_uint32_t nfiles;
+  /* must be divisible by 4.  */
+  grub_uint32_t inodes_offset;
+  /* must be divisible by 4.  */
+  grub_uint32_t string_ptrs_offset;
+};
+
+struct grub_greffs_inode
+{
+  grub_uint32_t start;
+  grub_uint32_t size;
+  grub_uint32_t mtime;
+  /* Currently always 0. If we ever need symlinks,
+     it could be added.  */
+  grub_uint32_t type;
+};
+
+#endif