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author | wdenk <wdenk> | 2002-11-18 00:14:45 (GMT) |
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committer | wdenk <wdenk> | 2002-11-18 00:14:45 (GMT) |
commit | 2262cfeef91458b01a1bfe3812ccbbfdf8b82807 (patch) | |
tree | 3657d48c8ce9089fc96682848859d035a1e8f115 /fs/fdos/fs.c | |
parent | 1d0350ed0b1b0f63e3fb5db6b19397b84a2ea1c7 (diff) | |
download | u-boot-2262cfeef91458b01a1bfe3812ccbbfdf8b82807.tar.xz |
* 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
Diffstat (limited to 'fs/fdos/fs.c')
-rw-r--r-- | fs/fdos/fs.c | 120 |
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 |