* 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

1 files changed, 120 insertions, 0 deletions

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