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authorwdenk <wdenk>2002-11-18 00:14:45 +0000
committerwdenk <wdenk>2002-11-18 00:14:45 +0000
commit2262cfeef91458b01a1bfe3812ccbbfdf8b82807 (patch)
tree3657d48c8ce9089fc96682848859d035a1e8f115 /fs/fdos/dev.c
parent1d0350ed0b1b0f63e3fb5db6b19397b84a2ea1c7 (diff)
downloadtalos-obmc-uboot-2262cfeef91458b01a1bfe3812ccbbfdf8b82807.tar.gz
talos-obmc-uboot-2262cfeef91458b01a1bfe3812ccbbfdf8b82807.zip
* Patch by Daniel Engstrm, 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
Diffstat (limited to 'fs/fdos/dev.c')
-rw-r--r--fs/fdos/dev.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/fs/fdos/dev.c b/fs/fdos/dev.c
new file mode 100644
index 0000000000..f38d07dbd8
--- /dev/null
+++ b/fs/fdos/dev.c
@@ -0,0 +1,195 @@
+/*
+ * (C) Copyright 2002
+ * Stubli 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 "dos.h"
+#include "fdos.h"
+
+#if (CONFIG_COMMANDS & CFG_CMD_FDOS)
+
+#define NB_HEADS 2
+#define NB_TRACKS 80
+#define NB_SECTORS 18
+
+
+static int lastwhere;
+
+/*-----------------------------------------------------------------------------
+ * dev_open --
+ *-----------------------------------------------------------------------------
+ */
+int dev_open (void)
+{
+ lastwhere = 0;
+ return (0);
+}
+
+/*-----------------------------------------------------------------------------
+ * dev_read -- len and where are sectors number
+ *-----------------------------------------------------------------------------
+ */
+int dev_read (void *buffer, int where, int len)
+{
+ PRINTF ("dev_read (len = %d, where = %d)\n", len, where);
+
+ /* Si on ne desire pas lire a la position courante, il faut un seek */
+ if (where != lastwhere) {
+ if (!fdc_fdos_seek (where)) {
+ PRINTF ("seek error in dev_read");
+ lastwhere = -1;
+ return (-1);
+ }
+ }
+
+ if (!fdc_fdos_read (buffer, len)) {
+ PRINTF ("read error\n");
+ lastwhere = -1;
+ return (-1);
+ }
+ lastwhere = where + len;
+ return (0);
+}
+/*-----------------------------------------------------------------------------
+ * check_dev -- verify the diskette format
+ *-----------------------------------------------------------------------------
+ */
+int check_dev (BootSector_t *boot, Fs_t *fs)
+{
+ unsigned int heads, sectors, tracks;
+ int BootP, Infp0, InfpX, InfTm;
+ int sect_per_track;
+
+ /* Display Boot header */
+ PRINTF ("Jump to boot code 0x%02x 0x%02x 0x%02x\n",
+ boot -> jump [0], boot -> jump [1], boot -> jump[2]);
+ PRINTF ("OEM name & version '%*.*s'\n",
+ BANNER_LG, BANNER_LG, boot -> banner );
+ PRINTF ("Bytes per sector hopefully 512 %d\n",
+ __le16_to_cpu (boot -> secsiz));
+ PRINTF ("Cluster size in sectors %d\n",
+ boot -> clsiz);
+ PRINTF ("Number of reserved (boot) sectors %d\n",
+ __le16_to_cpu (boot -> nrsvsect));
+ PRINTF ("Number of FAT tables hopefully 2 %d\n",
+ boot -> nfat);
+ PRINTF ("Number of directory slots %d\n",
+ __le16_to_cpu (boot -> dirents));
+ PRINTF ("Total sectors on disk %d\n",
+ __le16_to_cpu (boot -> psect));
+ PRINTF ("Media descriptor=first byte of FAT %d\n",
+ boot -> descr);
+ PRINTF ("Sectors in FAT %d\n",
+ __le16_to_cpu (boot -> fatlen));
+ PRINTF ("Sectors/track %d\n",
+ __le16_to_cpu (boot -> nsect));
+ PRINTF ("Heads %d\n",
+ __le16_to_cpu (boot -> nheads));
+ PRINTF ("number of hidden sectors %d\n",
+ __le32_to_cpu (boot -> nhs));
+ PRINTF ("big total sectors %d\n",
+ __le32_to_cpu (boot -> bigsect));
+ PRINTF ("physical drive ? %d\n",
+ boot -> physdrive);
+ PRINTF ("reserved %d\n",
+ boot -> reserved);
+ PRINTF ("dos > 4.0 diskette %d\n",
+ boot -> dos4);
+ PRINTF ("serial number %d\n",
+ __le32_to_cpu (boot -> serial));
+ PRINTF ("disk label %*.*s\n",
+ LABEL_LG, LABEL_LG, boot -> label);
+ PRINTF ("FAT type %8.8s\n",
+ boot -> fat_type);
+ PRINTF ("reserved by 2M %d\n",
+ boot -> res_2m);
+ PRINTF ("2M checksum (not used) %d\n",
+ boot -> CheckSum);
+ PRINTF ("2MF format version %d\n",
+ boot -> fmt_2mf);
+ PRINTF ("1 if write track after format %d\n",
+ boot -> wt);
+ PRINTF ("data transfer rate on track 0 %d\n",
+ boot -> rate_0);
+ PRINTF ("data transfer rate on track<>0 %d\n",
+ boot -> rate_any);
+ PRINTF ("offset to boot program %d\n",
+ __le16_to_cpu (boot -> BootP));
+ PRINTF ("T1: information for track 0 %d\n",
+ __le16_to_cpu (boot -> Infp0));
+ PRINTF ("T2: information for track<>0 %d\n",
+ __le16_to_cpu (boot -> InfpX));
+ PRINTF ("T3: track sectors size table %d\n",
+ __le16_to_cpu (boot -> InfTm));
+ PRINTF ("Format date 0x%04x\n",
+ __le16_to_cpu (boot -> DateF));
+ PRINTF ("Format time 0x%04x\n",
+ __le16_to_cpu (boot -> TimeF));
+
+
+ /* informations are extracted from boot sector */
+ heads = __le16_to_cpu (boot -> nheads);
+ sectors = __le16_to_cpu (boot -> nsect);
+ fs -> tot_sectors = __le32_to_cpu (boot -> bigsect);
+ if (__le16_to_cpu (boot -> psect) != 0) {
+ fs -> tot_sectors = __le16_to_cpu (boot -> psect);
+ }
+
+ sect_per_track = heads * sectors;
+ tracks = (fs -> tot_sectors + sect_per_track - 1) / sect_per_track;
+
+ BootP = __le16_to_cpu (boot -> BootP);
+ Infp0 = __le16_to_cpu (boot -> Infp0);
+ InfpX = __le16_to_cpu (boot -> InfpX);
+ InfTm = __le16_to_cpu (boot -> InfTm);
+
+ if (boot -> dos4 == EXTENDED_BOOT &&
+ strncmp( boot->banner,"2M", 2 ) == 0 &&
+ BootP < SZ_STD_SECTOR &&
+ Infp0 < SZ_STD_SECTOR &&
+ InfpX < SZ_STD_SECTOR &&
+ InfTm < SZ_STD_SECTOR &&
+ BootP >= InfTm + 2 &&
+ InfTm >= InfpX &&
+ InfpX >= Infp0 &&
+ Infp0 >= 76 ) {
+
+ return (-1);
+ }
+
+ if (heads != NB_HEADS ||
+ tracks != NB_TRACKS ||
+ sectors != NB_SECTORS ||
+ __le16_to_cpu (boot -> secsiz) != SZ_STD_SECTOR ||
+ fs -> tot_sectors == 0 ||
+ (fs -> tot_sectors % sectors) != 0) {
+ return (-1);
+ }
+
+ return (0);
+}
+
+
+#endif
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