* Patch by Daniel Engström, 13 Nov 2002:
Add support for i386 architecture and AMD SC520 board
* Patch by Pierre Aubert, 12 Nov 2002:
Add support for DOS filesystem and booting from DOS floppy disk
diff --git a/fs/fdos/fs.c b/fs/fdos/fs.c
new file mode 100644
index 0000000..68bbde0
--- /dev/null
+++ b/fs/fdos/fs.c
@@ -0,0 +1,120 @@
+/*
+ * (C) Copyright 2002
+ * Stäubli Faverges - <www.staubli.com>
+ * Pierre AUBERT p.aubert@staubli.com
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <config.h>
+#include <malloc.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_FDOS)
+
+#include "dos.h"
+#include "fdos.h"
+
+
+/*-----------------------------------------------------------------------------
+ * fill_fs -- Read info on file system
+ *-----------------------------------------------------------------------------
+ */
+static int fill_fs (BootSector_t *boot, Fs_t *fs)
+{
+
+ fs -> fat_start = __le16_to_cpu (boot -> nrsvsect);
+ fs -> fat_len = __le16_to_cpu (boot -> fatlen);
+ fs -> nb_fat = boot -> nfat;
+
+ fs -> dir_start = fs -> fat_start + fs -> nb_fat * fs -> fat_len;
+ fs -> dir_len = __le16_to_cpu (boot -> dirents) * MDIR_SIZE / SZ_STD_SECTOR;
+ fs -> cluster_size = boot -> clsiz;
+ fs -> num_clus = (fs -> tot_sectors - fs -> dir_start - fs -> dir_len) / fs -> cluster_size;
+
+ return (0);
+}
+
+/*-----------------------------------------------------------------------------
+ * fs_init --
+ *-----------------------------------------------------------------------------
+ */
+int fs_init (Fs_t *fs)
+{
+ BootSector_t *boot;
+
+ /* Initialize physical device */
+ if (dev_open () < 0) {
+ PRINTF ("Unable to initialize the fdc\n");
+ return (-1);
+ }
+ init_subdir ();
+
+ /* Allocate space for read the boot sector */
+ if ((boot = (BootSector_t *)malloc (sizeof (BootSector_t))) == NULL) {
+ PRINTF ("Unable to allocate space for boot sector\n");
+ return (-1);
+ }
+
+ /* read boot sector */
+ if (dev_read (boot, 0, 1)){
+ PRINTF ("Error during boot sector read\n");
+ free (boot);
+ return (-1);
+ }
+
+ /* we verify it'a a DOS diskette */
+ if (boot -> jump [0] != JUMP_0_1 && boot -> jump [0] != JUMP_0_2) {
+ PRINTF ("Not a DOS diskette\n");
+ free (boot);
+ return (-1);
+ }
+
+ if (boot -> descr < MEDIA_STD) {
+ /* We handle only recent medias (type F0) */
+ PRINTF ("unrecognized diskette type\n");
+ free (boot);
+ return (-1);
+ }
+
+ if (check_dev (boot, fs) < 0) {
+ PRINTF ("Bad diskette\n");
+ free (boot);
+ return (-1);
+ }
+
+ if (fill_fs (boot, fs) < 0) {
+ free (boot);
+
+ return (-1);
+ }
+
+ /* Read FAT */
+ if (read_fat (boot, fs) < 0) {
+ free (boot);
+ return (-1);
+ }
+
+ free (boot);
+ return (0);
+}
+
+
+
+#endif