diff -urN grub2_2007_05_31_original/commands/i386/pc/map.c grub2_2007_05_31_map/commands/i386/pc/map.c
--- grub2_2007_05_31_original/commands/i386/pc/map.c	1970-01-01 01:00:00.000000000 +0100
+++ grub2_2007_05_31_map/commands/i386/pc/map.c	2007-06-17 05:56:15.000000000 +0200
@@ -0,0 +1,107 @@
+/* map.c - Define drives map array  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2005  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 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <grub/normal.h>
+#include <grub/dl.h>
+#include <grub/arg.h>
+#include <grub/disk.h>
+#include <grub/term.h>
+#include <grub/misc.h>
+#include <grub/device.h>
+#include <grub/file.h>
+
+/* The size of the drive map.  */
+#define DRIVE_MAP_SIZE		16
+/* The BIOS drive map.  */
+static unsigned short bios_drive_map[DRIVE_MAP_SIZE + 1];
+
+int real_map_func (unsigned long to, unsigned long from) {
+int i;
+  /* Search for an empty slot in BIOS_DRIVE_MAP.  */
+  for (i = 0; i < DRIVE_MAP_SIZE; i++)
+    {
+      /* Perhaps the user wants to override the map.  */
+      if ((bios_drive_map[i] & 0xff) == from)
+	break;
+      
+      if (! bios_drive_map[i])
+	break;
+    }
+
+  if (i == DRIVE_MAP_SIZE)
+    {
+      return GRUB_ERR_OUT_OF_RANGE;
+    }
+
+  if (to == from)
+    /* If TO is equal to FROM, delete the entry.  */
+    grub_memmove ((char *) &bios_drive_map[i], (char *) &bios_drive_map[i + 1],
+		  sizeof (unsigned short) * (DRIVE_MAP_SIZE - i));
+  else
+    bios_drive_map[i] = from | (to << 8);
+  
+  return 0;
+
+
+}
+
+
+
+static grub_err_t
+grub_cmd_map (struct grub_arg_list *state __attribute__ ((unused)),
+	       int argc, char **args)
+{
+  grub_disk_t map_disk_to,map_disk_from;
+
+/* TODO: Check map arguments from grub2 engine */  
+  if (argc != 2)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "Two devices required");
+  map_disk_to = grub_disk_open (grub_file_get_device_name(args[0]));
+  if (! map_disk_to)
+    return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "Unknown TO disk");
+/* This was a marco_g suggestion but it does not make sense to me.
+  if (grub_strcmp(map_disk_to->name,"biosdisk"))
+    return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "TO disk is not a bios disk.");
+*/
+  map_disk_from = grub_disk_open (grub_file_get_device_name(args[1]));
+  if (! map_disk_from)
+    return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "Unknown FROM disk");
+/* This was a marco_g suggestion but it does not make sense to me.
+  if (grub_strcmp(map_disk_from->name,"biosdisk"))
+    return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "FROM disk is not a bios disk.");
+*/
+
+
+  return (real_map_func(map_disk_to->id,map_disk_from->id));
+  
+}
+
+
+GRUB_MOD_INIT(map)
+{
+  (void)mod;			/* To stop warning. */
+  grub_register_command ("map", grub_cmd_map, GRUB_COMMAND_FLAG_BOTH,
+			 "map TODEVICE FROMDEVICE", "Map a drive to another", 0);
+}
+
+GRUB_MOD_FINI(map)
+{
+  grub_unregister_command ("map");
+}

diff -urN grub2_2007_05_31_original/conf/i386-pc.rmk grub2_2007_05_31_map/conf/i386-pc.rmk
--- grub2_2007_05_31_original/conf/i386-pc.rmk	2007-06-11 11:53:27.000000000 +0200
+++ grub2_2007_05_31_map/conf/i386-pc.rmk	2007-06-14 12:38:00.000000000 +0200
@@ -1,5 +1,7 @@
 # -*- makefile -*-
 
+
+
 COMMON_ASFLAGS = -nostdinc -fno-builtin -m32
 COMMON_CFLAGS = -fno-builtin -mrtd -mregparm=3 -m32
 COMMON_LDFLAGS = -m32 -nostdlib
@@ -121,7 +123,7 @@
 pkgdata_MODULES = _chain.mod _linux.mod linux.mod normal.mod \
 	_multiboot.mod chain.mod multiboot.mod reboot.mod halt.mod	\
 	vbe.mod vbetest.mod vbeinfo.mod video.mod gfxterm.mod \
-	videotest.mod play.mod bitmap.mod tga.mod cpuid.mod
+	videotest.mod map.mod play.mod bitmap.mod tga.mod cpuid.mod
 
 # For _chain.mod.
 _chain_mod_SOURCES = loader/i386/pc/chainloader.c
@@ -195,6 +197,11 @@
 vbetest_mod_CFLAGS = $(COMMON_CFLAGS)
 vbetest_mod_LDFLAGS = $(COMMON_LDFLAGS)
 
+# For map.mod.
+map_mod_SOURCES = commands/i386/pc/map.c
+map_mod_CFLAGS = $(COMMON_CFLAGS)
+map_mod_LDFLAGS = $(COMMON_LDFLAGS)
+
 # For play.mod.
 play_mod_SOURCES = commands/i386/pc/play.c
 play_mod_CFLAGS = $(COMMON_CFLAGS)