* Fix CONFIG_NET_MULTI support in include/net.h

* Patches by Kyle Harris, 13 Mar 2003:
  - Add FAT partition support
  - Add command support for FAT
  - Add command support for MMC
  ----
  - Add Intel PXA support for video
  - Add Intel PXA support for MMC
  ----
  - Enable MMC and FAT for lubbock board
  - Other misc changes for lubbock board

4 files changed, 1156 insertions, 1 deletions

diff --git a/fs/Makefile b/fs/Makefile
index ad74942..27ee6fb 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -22,7 +22,7 @@
 #
 #
 
-SUBDIRS	:= jffs2 fdos
+SUBDIRS	:= jffs2 fdos fat
 
 .depend all:
 	@for dir in $(SUBDIRS) ; do \
diff --git a/fs/fat/Makefile b/fs/fat/Makefile
new file mode 100644
index 0000000..e462757
--- /dev/null
+++ b/fs/fat/Makefile
@@ -0,0 +1,46 @@
+#
+#
+# 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
+#
+
+TOPDIR=../../
+
+include $(TOPDIR)/config.mk
+
+LIB	= libfat.a
+
+AOBJS	=
+COBJS	= fat.o file.o
+
+OBJS	= $(AOBJS) $(COBJS)
+
+all:	$(LIB) $(AOBJS)
+
+$(LIB):	.depend $(OBJS)
+	$(AR) crv $@ $(OBJS)
+
+
+#########################################################################
+
+.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
+		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+
+sinclude .depend
+
+#########################################################################
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
new file mode 100644
index 0000000..9f01567
--- /dev/null
+++ b/fs/fat/fat.c
@@ -0,0 +1,901 @@
+/*
+ * fat.c
+ *
+ * R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
+ *
+ * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
+ * 2003-03-10 - kharris@nexus-tech.net - ported to uboot
+ *
+ * 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 <fat.h>
+#include <asm/byteorder.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_FAT)
+
+/*
+ * Convert a string to lowercase.
+ */
+static void
+downcase(char *str)
+{
+	while (*str != '\0') {
+		TOLOWER(*str);
+		str++;
+	}
+}
+
+int (*dev_block_read)(int device, __u32 blknr, __u32 blkcnt, __u8 *buffer) = 0;
+
+int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr)
+{
+	/* FIXME we need to determine the start block of the
+	 * partition where the DOS FS resides
+	 */
+	startblock += 32;
+
+	if (dev_block_read) {
+		return dev_block_read (0, startblock, getsize, bufptr);
+	}
+	return -1;
+}
+
+
+int
+fat_register_read (int (*block_read)(int, __u32, __u32, __u8 *))
+{
+	dev_block_read = block_read;
+	return 0;
+}
+
+
+/*
+ * Get the first occurence of a directory delimiter ('/' or '\') in a string.
+ * Return index into string if found, -1 otherwise.
+ */
+static int
+dirdelim(char *str)
+{
+	char *start = str;
+
+	while (*str != '\0') {
+		if (ISDIRDELIM(*str)) return str - start;
+		str++;
+	}
+	return -1;
+}
+
+
+/*
+ * Match volume_info fs_type strings.
+ * Return 0 on match, -1 otherwise.
+ */
+static int
+compare_sign(char *str1, char *str2)
+{
+	char *end = str1+SIGNLEN;
+
+	while (str1 != end) {
+		if (*str1 != *str2) {
+			return -1;
+		}
+		str1++;
+		str2++;
+	}
+
+	return 0;
+}
+
+
+/*
+ * Extract zero terminated short name from a directory entry.
+ */
+static void get_name (dir_entry *dirent, char *s_name)
+{
+	char *ptr;
+
+	memcpy (s_name, dirent->name, 8);
+	s_name[8] = '\0';
+	ptr = s_name;
+	while (*ptr && *ptr != ' ')
+		ptr++;
+	if (dirent->ext[0] && dirent->ext[0] != ' ') {
+		*ptr = '.';
+		ptr++;
+		memcpy (ptr, dirent->ext, 3);
+		ptr[3] = '\0';
+		while (*ptr && *ptr != ' ')
+			ptr++;
+	}
+	*ptr = '\0';
+	if (*s_name == DELETED_FLAG)
+		*s_name = '\0';
+	else if (*s_name == aRING)
+		*s_name = 'å';
+	downcase (s_name);
+}
+
+/*
+ * Get the entry at index 'entry' in a FAT (12/16/32) table.
+ * On failure 0x00 is returned.
+ */
+static __u32
+get_fatent(fsdata *mydata, __u32 entry)
+{
+	__u32 bufnum;
+	__u32 offset;
+	__u32 ret = 0x00;
+
+	switch (mydata->fatsize) {
+	case 32:
+		bufnum = entry / FAT32BUFSIZE;
+		offset = entry - bufnum * FAT32BUFSIZE;
+		break;
+	case 16:
+		bufnum = entry / FAT16BUFSIZE;
+		offset = entry - bufnum * FAT16BUFSIZE;
+		break;
+	case 12:
+		bufnum = entry / FAT12BUFSIZE;
+		offset = entry - bufnum * FAT12BUFSIZE;
+		break;
+
+	default:
+		/* Unsupported FAT size */
+		return ret;
+	}
+
+	/* Read a new block of FAT entries into the cache. */
+	if (bufnum != mydata->fatbufnum) {
+		int getsize = FATBUFSIZE/FS_BLOCK_SIZE;
+		__u8 *bufptr = mydata->fatbuf;
+		__u32 fatlength = mydata->fatlength;
+		__u32 startblock = bufnum * FATBUFBLOCKS;
+
+		fatlength *= SECTOR_SIZE;	/* We want it in bytes now */
+		startblock += mydata->fat_sect;	/* Offset from start of disk */
+
+		if (getsize > fatlength) getsize = fatlength;
+		if (disk_read(startblock, getsize, bufptr) < 0) {
+			FAT_DPRINT("Error reading FAT blocks\n");
+			return ret;
+		}
+		mydata->fatbufnum = bufnum;
+	}
+
+	/* Get the actual entry from the table */
+	switch (mydata->fatsize) {
+	case 32:
+		ret = FAT2CPU32(((__u32*)mydata->fatbuf)[offset]);
+		break;
+	case 16:
+		ret = FAT2CPU16(((__u16*)mydata->fatbuf)[offset]);
+		break;
+	case 12: {
+		__u32 off16 = (offset*3)/4;
+		__u16 val1, val2;
+
+		switch (offset & 0x3) {
+		case 0:
+			ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
+			ret &= 0xfff;
+			break;
+		case 1:
+			val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
+			val1 &= 0xf000;
+			val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]);
+			val2 &= 0x00ff;
+			ret = (val2 << 4) | (val1 >> 12);
+			break;
+		case 2:
+			val1 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);
+			val1 &= 0xff00;
+			val2 = FAT2CPU16(((__u16*)mydata->fatbuf)[off16+1]);
+			val2 &= 0x000f;
+			ret = (val2 << 8) | (val1 >> 8);
+			break;
+		case 3:
+			ret = FAT2CPU16(((__u16*)mydata->fatbuf)[off16]);;
+			ret = (ret & 0xfff0) >> 4;
+			break;
+		default:
+			break;
+		}
+	}
+	break;
+	}
+	FAT_DPRINT("ret: %d, offset: %d\n", ret, offset);
+
+	return ret;
+}
+
+
+/*
+ * Read at most 'size' bytes from the specified cluster into 'buffer'.
+ * Return 0 on success, -1 otherwise.
+ */
+static int
+get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size)
+{
+	int idx = 0;
+	__u32 startsect;
+
+	if (clustnum > 0) {
+		startsect = mydata->data_begin + clustnum*mydata->clust_size;
+	} else {
+		startsect = mydata->rootdir_sect;
+	}
+
+	FAT_DPRINT("gc - clustnum: %d, startsect: %d\n", clustnum, startsect);
+	while (size > 0) {
+		if (size >= FS_BLOCK_SIZE) {
+			if (disk_read(startsect + idx, 1, buffer) < 0) {
+				FAT_DPRINT("Error reading data\n");
+				return -1;
+			}
+		} else {
+			__u8 tmpbuf[FS_BLOCK_SIZE];
+			if (disk_read(startsect + idx, 1, tmpbuf) < 0) {
+				FAT_DPRINT("Error reading data\n");
+				return -1;
+			}
+			memcpy(buffer, tmpbuf, size);
+
+			return 0;
+		}
+		buffer += FS_BLOCK_SIZE;
+		size -= FS_BLOCK_SIZE;
+		idx++;
+	}
+
+	return 0;
+}
+
+
+/*
+ * Read at most 'maxsize' bytes from the file associated with 'dentptr'
+ * into 'buffer'.
+ * Return the number of bytes read or -1 on fatal errors.
+ */
+static long
+get_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
+	     unsigned long maxsize)
+{
+	unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
+	unsigned int bytesperclust = mydata->clust_size * SECTOR_SIZE;
+	__u32 curclust = START(dentptr);
+
+	FAT_DPRINT("Filesize: %ld bytes\n", filesize);
+
+	if (maxsize > 0 && filesize > maxsize) filesize = maxsize;
+
+	FAT_DPRINT("Reading: %ld bytes\n", filesize);
+
+	do {
+		int getsize = (filesize > bytesperclust) ? bytesperclust :
+			filesize;
+
+		if (get_cluster(mydata, curclust, buffer, getsize) != 0) {
+			FAT_ERROR("Error reading cluster\n");
+			return -1;
+		}
+		gotsize += getsize;
+		filesize -= getsize;
+		if (filesize <= 0) return gotsize;
+		buffer += getsize;
+
+		curclust = get_fatent(mydata, curclust);
+		if (curclust <= 0x0001 || curclust >= 0xfff0) {
+			FAT_DPRINT("curclust: 0x%x\n", curclust);
+			FAT_ERROR("Invalid FAT entry\n");
+			return gotsize;
+		}
+	} while (1);
+}
+
+
+#ifdef CONFIG_SUPPORT_VFAT
+/*
+ * Extract the file name information from 'slotptr' into 'l_name',
+ * starting at l_name[*idx].
+ * Return 1 if terminator (zero byte) is found, 0 otherwise.
+ */
+static int
+slot2str(dir_slot *slotptr, char *l_name, int *idx)
+{
+	int j;
+
+	for (j = 0; j <= 8; j += 2) {
+		l_name[*idx] = slotptr->name0_4[j];
+		if (l_name[*idx] == 0x00) return 1;
+		(*idx)++;
+	}
+	for (j = 0; j <= 10; j += 2) {
+		l_name[*idx] = slotptr->name5_10[j];
+		if (l_name[*idx] == 0x00) return 1;
+		(*idx)++;
+	}
+	for (j = 0; j <= 2; j += 2) {
+		l_name[*idx] = slotptr->name11_12[j];
+		if (l_name[*idx] == 0x00) return 1;
+		(*idx)++;
+	}
+
+	return 0;
+}
+
+
+/*
+ * Extract the full long filename starting at 'retdent' (which is really
+ * a slot) into 'l_name'. If successful also copy the real directory entry
+ * into 'retdent'
+ * Return 0 on success, -1 otherwise.
+ */
+static int
+get_vfatname(fsdata *mydata, int curclust, __u8 *cluster,
+	     dir_entry *retdent, char *l_name)
+{
+	dir_entry *realdent;
+	dir_slot  *slotptr = (dir_slot*) retdent;
+	__u8	  *nextclust = cluster + mydata->clust_size * SECTOR_SIZE;
+	__u8	   counter = slotptr->id & 0xf;
+	int idx = 0;
+
+	while ((__u8*)slotptr < nextclust) {
+		if (counter == 0) break;
+		if ((slotptr->id & 0x0f) != counter) return -1;
+		slotptr++;
+		counter--;
+	}
+
+	if ((__u8*)slotptr >= nextclust) {
+		__u8	 block[MAX_CLUSTSIZE];
+		dir_slot *slotptr2;
+
+		slotptr--;
+		curclust = get_fatent(mydata, curclust);
+		if (curclust <= 0x0001 || curclust >= 0xfff0) {
+			FAT_DPRINT("curclust: 0x%x\n", curclust);
+			FAT_ERROR("Invalid FAT entry\n");
+			return -1;
+		}
+		if (get_cluster(mydata, curclust, block,
+				mydata->clust_size * SECTOR_SIZE) != 0) {
+			FAT_DPRINT("Error: reading directory block\n");
+			return -1;
+		}
+		slotptr2 = (dir_slot*) block;
+		while (slotptr2->id > 0x01) {
+			slotptr2++;
+		}
+		/* Save the real directory entry */
+		realdent = (dir_entry*)slotptr2 + 1;
+		while ((__u8*)slotptr2 >= block) {
+			slot2str(slotptr2, l_name, &idx);
+			slotptr2--;
+		}
+	} else {
+		/* Save the real directory entry */
+		realdent = (dir_entry*)slotptr;
+	}
+
+	do {
+		slotptr--;
+		if (slot2str(slotptr, l_name, &idx)) break;
+	} while (!(slotptr->id & 0x40));
+
+	l_name[idx] = '\0';
+	if (*l_name == DELETED_FLAG) *l_name = '\0';
+	else if (*l_name == aRING) *l_name = 'å';
+	downcase(l_name);
+
+	/* Return the real directory entry */
+	memcpy(retdent, realdent, sizeof(dir_entry));
+
+	return 0;
+}
+
+
+/* Calculate short name checksum */
+static __u8
+mkcksum(const char *str)
+{
+	int i;
+	__u8 ret = 0;
+
+	for (i = 0; i < 11; i++) {
+		ret = (((ret&1)<<7)|((ret&0xfe)>>1)) + str[i];
+	}
+
+	return ret;
+}
+#endif
+
+
+/*
+ * Get the directory entry associated with 'filename' from the directory
+ * starting at 'startsect'
+ */
+static dir_entry *get_dentfromdir (fsdata * mydata, int startsect,
+				   char *filename, dir_entry * retdent,
+				   int dols)
+{
+    __u16 prevcksum = 0xffff;
+    __u8 block[MAX_CLUSTSIZE];
+    __u32 curclust = START (retdent);
+    int files = 0, dirs = 0;
+
+    FAT_DPRINT ("get_dentfromdir: %s\n", filename);
+    while (1) {
+	dir_entry *dentptr;
+	int i;
+
+	if (get_cluster (mydata, curclust, block,
+		 mydata->clust_size * SECTOR_SIZE) != 0) {
+	    FAT_DPRINT ("Error: reading directory block\n");
+	    return NULL;
+	}
+	dentptr = (dir_entry *) block;
+	for (i = 0; i < DIRENTSPERCLUST; i++) {
+	    char s_name[14], l_name[256];
+
+	    l_name[0] = '\0';
+	    if ((dentptr->attr & ATTR_VOLUME)) {
+#ifdef CONFIG_SUPPORT_VFAT
+		if ((dentptr->attr & ATTR_VFAT) &&
+		    (dentptr->name[0] & 0x40)) {
+		    prevcksum = ((dir_slot *) dentptr)
+			    ->alias_checksum;
+		    get_vfatname (mydata, curclust, block,
+				  dentptr, l_name);
+		    if (dols) {
+			int isdir = (dentptr->attr & ATTR_DIR);
+			char dirc;
+			int doit = 0;
+
+			if (isdir) {
+			    dirs++;
+			    dirc = '/';
+			    doit = 1;
+			} else {
+			    dirc = ' ';
+			    if (l_name[0] != 0) {
+				files++;
+				doit = 1;
+			    }
+			}
+			if (doit) {
+			    if (dirc == ' ') {
+				printf (" %8ld   %s%c\n",
+					(long) FAT2CPU32 (dentptr->size),
+					l_name, dirc);
+			    } else {
+				printf ("            %s%c\n", l_name, dirc);
+			    }
+			}
+			dentptr++;
+			continue;
+		    }
+		    FAT_DPRINT ("vfatname: |%s|\n", l_name);
+		} else
+#endif
+		{
+		    /* Volume label or VFAT entry */
+		    dentptr++;
+		    continue;
+		}
+	    }
+	    if (dentptr->name[0] == 0) {
+		if (dols) {
+		    printf ("\n%d file(s), %d dir(s)\n\n", files, dirs);
+		}
+		FAT_DPRINT ("Dentname == NULL - %d\n", i);
+		return NULL;
+	    }
+#ifdef CONFIG_SUPPORT_VFAT
+	    if (dols && mkcksum (dentptr->name) == prevcksum) {
+		dentptr++;
+		continue;
+	    }
+#endif
+	    get_name (dentptr, s_name);
+	    if (dols) {
+		int isdir = (dentptr->attr & ATTR_DIR);
+		char dirc;
+		int doit = 0;
+
+		if (isdir) {
+		    dirs++;
+		    dirc = '/';
+		    doit = 1;
+		} else {
+		    dirc = ' ';
+		    if (s_name[0] != 0) {
+			files++;
+			doit = 1;
+		    }
+		}
+		if (doit) {
+		    if (dirc == ' ') {
+			printf (" %8ld   %s%c\n",
+				(long) FAT2CPU32 (dentptr->size), s_name,
+				dirc);
+		    } else {
+			printf ("            %s%c\n", s_name, dirc);
+		    }
+		}
+		dentptr++;
+		continue;
+	    }
+	    if (strcmp (filename, s_name) && strcmp (filename, l_name)) {
+		FAT_DPRINT ("Mismatch: |%s|%s|\n", s_name, l_name);
+		dentptr++;
+		continue;
+	    }
+	    memcpy (retdent, dentptr, sizeof (dir_entry));
+
+	    FAT_DPRINT ("DentName: %s", s_name);
+	    FAT_DPRINT (", start: 0x%x", START (dentptr));
+	    FAT_DPRINT (", size:  0x%x %s\n",
+			FAT2CPU32 (dentptr->size),
+			(dentptr->attr & ATTR_DIR) ? "(DIR)" : "");
+
+	    return retdent;
+	}
+	curclust = get_fatent (mydata, curclust);
+	if (curclust <= 0x0001 || curclust >= 0xfff0) {
+	    FAT_DPRINT ("curclust: 0x%x\n", curclust);
+	    FAT_ERROR ("Invalid FAT entry\n");
+	    return NULL;
+	}
+    }
+
+    return NULL;
+}
+
+
+/*
+ * Read boot sector and volume info from a FAT filesystem
+ */
+static int
+read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
+{
+	__u8 block[FS_BLOCK_SIZE];
+	volume_info *vistart;
+
+	if (disk_read(0, 1, block) < 0) {
+		FAT_DPRINT("Error: reading block\n");
+		return -1;
+	}
+
+	memcpy(bs, block, sizeof(boot_sector));
+	bs->reserved	= FAT2CPU16(bs->reserved);
+	bs->fat_length	= FAT2CPU16(bs->fat_length);
+	bs->secs_track	= FAT2CPU16(bs->secs_track);
+	bs->heads	= FAT2CPU16(bs->heads);
+#if 0 /* UNUSED */
+	bs->hidden	= FAT2CPU32(bs->hidden);
+#endif
+	bs->total_sect	= FAT2CPU32(bs->total_sect);
+
+	/* FAT32 entries */
+	if (bs->fat_length == 0) {
+		/* Assume FAT32 */
+		bs->fat32_length = FAT2CPU32(bs->fat32_length);
+		bs->flags	 = FAT2CPU16(bs->flags);
+		bs->root_cluster = FAT2CPU32(bs->root_cluster);
+		bs->info_sector  = FAT2CPU16(bs->info_sector);
+		bs->backup_boot  = FAT2CPU16(bs->backup_boot);
+		vistart = (volume_info*) (block + sizeof(boot_sector));
+		*fatsize = 32;
+	} else {
+		vistart = (volume_info*) &(bs->fat32_length);
+		*fatsize = 0;
+	}
+	memcpy(volinfo, vistart, sizeof(volume_info));
+
+	/* Terminate fs_type string. Writing past the end of vistart
+	   is ok - it's just the buffer. */
+	vistart->fs_type[8] = '\0';
+
+	if (*fatsize == 32) {
+		if (compare_sign(FAT32_SIGN, vistart->fs_type) == 0) {
+			return 0;
+		}
+	} else {
+		if (compare_sign(FAT12_SIGN, vistart->fs_type) == 0) {
+			*fatsize = 12;
+			return 0;
+		}
+		if (compare_sign(FAT16_SIGN, vistart->fs_type) == 0) {
+			*fatsize = 16;
+			return 0;
+		}
+	}
+
+	FAT_DPRINT("Error: broken fs_type sign\n");
+	return -1;
+}
+
+
+static long
+do_fat_read (const char *filename, void *buffer, unsigned long maxsize,
+	     int dols)
+{
+    __u8 block[FS_BLOCK_SIZE];  /* Block buffer */
+    char fnamecopy[2048];
+    boot_sector bs;
+    volume_info volinfo;
+    fsdata datablock;
+    fsdata *mydata = &datablock;
+    dir_entry *dentptr;
+    __u16 prevcksum = 0xffff;
+    char *subname = "";
+    int rootdir_size, cursect;
+    int idx, isdir = 0;
+    int files = 0, dirs = 0;
+    long ret = 0;
+    int firsttime;
+
+    if (read_bootsectandvi (&bs, &volinfo, &mydata->fatsize)) {
+	FAT_DPRINT ("Error: reading boot sector\n");
+	return -1;
+    }
+    if (mydata->fatsize == 32) {
+	mydata->fatlength = bs.fat32_length;
+    } else {
+	mydata->fatlength = bs.fat_length;
+    }
+    mydata->fat_sect = bs.reserved;
+    cursect = mydata->rootdir_sect
+	    = mydata->fat_sect + mydata->fatlength * bs.fats;
+    mydata->clust_size = bs.cluster_size;
+    if (mydata->fatsize == 32) {
+	rootdir_size = mydata->clust_size;
+	mydata->data_begin = mydata->rootdir_sect   /* + rootdir_size */
+		- (mydata->clust_size * 2);
+    } else {
+	rootdir_size = ((bs.dir_entries[1] * (int) 256 + bs.dir_entries[0])
+			* sizeof (dir_entry)) / SECTOR_SIZE;
+	mydata->data_begin = mydata->rootdir_sect + rootdir_size
+		- (mydata->clust_size * 2);
+    }
+    mydata->fatbufnum = -1;
+
+    FAT_DPRINT ("FAT%d, fatlength: %d\n", mydata->fatsize,
+		mydata->fatlength);
+    FAT_DPRINT ("Rootdir begins at sector: %d, offset: %x, size: %d\n"
+		"Data begins at: %d\n",
+		mydata->rootdir_sect, mydata->rootdir_sect * SECTOR_SIZE,
+		rootdir_size, mydata->data_begin);
+    FAT_DPRINT ("Cluster size: %d\n", mydata->clust_size);
+
+    /* "cwd" is always the root... */
+    while (ISDIRDELIM (*filename))
+	filename++;
+    /* Make a copy of the filename and convert it to lowercase */
+    strcpy (fnamecopy, filename);
+    downcase (fnamecopy);
+    if (*fnamecopy == '\0') {
+	if (!dols)
+	    return -1;
+	dols = LS_ROOT;
+    } else if ((idx = dirdelim (fnamecopy)) >= 0) {
+	isdir = 1;
+	fnamecopy[idx] = '\0';
+	subname = fnamecopy + idx + 1;
+	/* Handle multiple delimiters */
+	while (ISDIRDELIM (*subname))
+	    subname++;
+    } else if (dols) {
+	isdir = 1;
+    }
+
+    while (1) {
+	int i;
+
+	if (disk_read (cursect, 1, block) < 0) {
+	    FAT_DPRINT ("Error: reading rootdir block\n");
+	    return -1;
+	}
+	dentptr = (dir_entry *) block;
+	for (i = 0; i < DIRENTSPERBLOCK; i++) {
+	    char s_name[14], l_name[256];
+
+	    l_name[0] = '\0';
+	    if ((dentptr->attr & ATTR_VOLUME)) {
+#ifdef CONFIG_SUPPORT_VFAT
+		if ((dentptr->attr & ATTR_VFAT) &&
+		    (dentptr->name[0] & 0x40)) {
+		    prevcksum = ((dir_slot *) dentptr)->alias_checksum;
+		    get_vfatname (mydata, 0, block, dentptr, l_name);
+		    if (dols == LS_ROOT) {
+			int isdir = (dentptr->attr & ATTR_DIR);
+			char dirc;
+			int doit = 0;
+
+			if (isdir) {
+			    dirs++;
+			    dirc = '/';
+			    doit = 1;
+			} else {
+			    dirc = ' ';
+			    if (l_name[0] != 0) {
+				files++;
+				doit = 1;
+			    }
+			}
+			if (doit) {
+			    if (dirc == ' ') {
+				printf (" %8ld   %s%c\n",
+					(long) FAT2CPU32 (dentptr->size),
+					l_name, dirc);
+			    } else {
+				printf ("            %s%c\n", l_name, dirc);
+			    }
+			}
+			dentptr++;
+			continue;
+		    }
+		    FAT_DPRINT ("Rootvfatname: |%s|\n", l_name);
+		} else
+#endif
+		{
+		    /* Volume label or VFAT entry */
+		    dentptr++;
+		    continue;
+		}
+	    } else if (dentptr->name[0] == 0) {
+		FAT_DPRINT ("RootDentname == NULL - %d\n", i);
+		if (dols == LS_ROOT) {
+		    printf ("\n%d file(s), %d dir(s)\n\n", files, dirs);
+		    return 0;
+		}
+		return -1;
+	    }
+#ifdef CONFIG_SUPPORT_VFAT
+	    else if (dols == LS_ROOT
+		     && mkcksum (dentptr->name) == prevcksum) {
+		dentptr++;
+		continue;
+	    }
+#endif
+	    get_name (dentptr, s_name);
+	    if (dols == LS_ROOT) {
+		int isdir = (dentptr->attr & ATTR_DIR);
+		char dirc;
+		int doit = 0;
+
+		if (isdir) {
+		    dirs++;
+		    dirc = '/';
+		    doit = 1;
+		} else {
+		    dirc = ' ';
+		    if (s_name[0] != 0) {
+			files++;
+			doit = 1;
+		    }
+		}
+		if (doit) {
+		    if (dirc == ' ') {
+			printf (" %8ld   %s%c\n",
+				(long) FAT2CPU32 (dentptr->size), s_name,
+				dirc);
+		    } else {
+			printf ("            %s%c\n", s_name, dirc);
+		    }
+		}
+		dentptr++;
+		continue;
+	    }
+	    if (strcmp (fnamecopy, s_name) && strcmp (fnamecopy, l_name)) {
+		FAT_DPRINT ("RootMismatch: |%s|%s|\n", s_name, l_name);
+		dentptr++;
+		continue;
+	    }
+	    if (isdir && !(dentptr->attr & ATTR_DIR))
+		return -1;
+
+	    FAT_DPRINT ("RootName: %s", s_name);
+	    FAT_DPRINT (", start: 0x%x", START (dentptr));
+	    FAT_DPRINT (", size:  0x%x %s\n",
+			FAT2CPU32 (dentptr->size), isdir ? "(DIR)" : "");
+
+	    goto rootdir_done;  /* We got a match */
+	}
+	cursect++;
+    }
+  rootdir_done:
+
+    firsttime = 1;
+    while (isdir) {
+	int startsect = mydata->data_begin
+		+ START (dentptr) * mydata->clust_size;
+	dir_entry dent;
+	char *nextname = NULL;
+
+	dent = *dentptr;
+	dentptr = &dent;
+
+	idx = dirdelim (subname);
+	if (idx >= 0) {
+	    subname[idx] = '\0';
+	    nextname = subname + idx + 1;
+	    /* Handle multiple delimiters */
+	    while (ISDIRDELIM (*nextname))
+		nextname++;
+	    if (dols && *nextname == '\0')
+		firsttime = 0;
+	} else {
+	    if (dols && firsttime) {
+		firsttime = 0;
+	    } else {
+		isdir = 0;
+	    }
+	}
+
+	if (get_dentfromdir (mydata, startsect, subname, dentptr,
+			     isdir ? 0 : dols) == NULL) {
+	    if (dols && !isdir)
+		return 0;
+	    return -1;
+	}
+
+	if (idx >= 0) {
+	    if (!(dentptr->attr & ATTR_DIR))
+		return -1;
+	    subname = nextname;
+	}
+    }
+    ret = get_contents (mydata, dentptr, buffer, maxsize);
+    FAT_DPRINT ("Size: %d, got: %ld\n", FAT2CPU32 (dentptr->size), ret);
+
+    return ret;
+}
+
+
+int
+file_fat_detectfs(void)
+{
+	boot_sector	bs;
+	volume_info	volinfo;
+	int		fatsize;
+
+	return read_bootsectandvi(&bs, &volinfo, &fatsize);
+}
+
+
+int
+file_fat_ls(const char *dir)
+{
+	return do_fat_read(dir, NULL, 0, LS_YES);
+}
+
+
+long
+file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
+{
+	return do_fat_read(filename, buffer, maxsize, LS_NO);
+}
+
+#endif /* #if (CONFIG_COMMANDS & CFG_CMD_FAT) */
diff --git a/fs/fat/file.c b/fs/fat/file.c
new file mode 100644
index 0000000..d375ba2
--- /dev/null
+++ b/fs/fat/file.c
@@ -0,0 +1,208 @@
+/* 
+ * file.c 
+ *
+ * Mini "VFS" by Marcus Sundberg
+ *
+ * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
+ * 2003-03-10 - kharris@nexus-tech.net - ported to uboot
+ *
+ * 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>
+#include <fat.h>
+#include <linux/stat.h>
+#include <linux/time.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_FAT)
+
+/* Supported filesystems */
+static const struct filesystem filesystems[] = {
+	{ file_fat_detectfs,  file_fat_ls,  file_fat_read,  "FAT" },
+};
+#define NUM_FILESYS	(sizeof(filesystems)/sizeof(struct filesystem))
+
+/* The filesystem which was last detected */
+static int current_filesystem = FSTYPE_NONE;
+
+/* The current working directory */
+#define CWD_LEN		511
+char file_cwd[CWD_LEN+1] = "/";
+
+const char *
+file_getfsname(int idx)
+{
+	if (idx < 0 || idx >= NUM_FILESYS) return NULL;
+
+	return filesystems[idx].name;
+}
+
+
+static void
+pathcpy(char *dest, const char *src)
+{
+	char *origdest = dest;
+
+	do {
+		if (dest-file_cwd >= CWD_LEN) {
+			*dest = '\0';
+			return;
+		}
+		*(dest) = *(src);
+		if (*src == '\0') {
+			if (dest-- != origdest && ISDIRDELIM(*dest)) {
+				*dest = '\0';
+			}
+			return;
+		}
+		++dest;
+		if (ISDIRDELIM(*src)) {
+			while (ISDIRDELIM(*src)) src++;
+		} else {
+			src++;
+		}
+	} while (1);
+}
+
+
+int
+file_cd(const char *path)
+{
+	if (ISDIRDELIM(*path)) {
+		while (ISDIRDELIM(*path)) path++;
+		strncpy(file_cwd+1, path, CWD_LEN-1);
+	} else {
+		const char *origpath = path;
+		char *tmpstr = file_cwd;
+		int back = 0;
+
+		while (*tmpstr != '\0') tmpstr++;
+		do {
+			tmpstr--;
+		} while (ISDIRDELIM(*tmpstr));
+
+		while (*path == '.') {
+			path++;
+			while (*path == '.') {
+				path++;
+				back++;
+			}
+			if (*path != '\0' && !ISDIRDELIM(*path)) {
+				path = origpath;
+				back = 0;
+				break;
+			}
+			while (ISDIRDELIM(*path)) path++;
+			origpath = path;
+		}
+
+		while (back--) {
+			/* Strip off path component */
+			while (!ISDIRDELIM(*tmpstr)) {
+				tmpstr--;
+			}
+			if (tmpstr == file_cwd) {
+				/* Incremented again right after the loop. */
+				tmpstr--;
+				break;
+			}
+			/* Skip delimiters */
+			while (ISDIRDELIM(*tmpstr)) tmpstr--;
+		}
+		tmpstr++;
+		if (*path == '\0') {
+			if (tmpstr == file_cwd) {
+				*tmpstr = '/';
+				tmpstr++;
+			}
+			*tmpstr = '\0';
+			return 0;
+		}
+		*tmpstr = '/';
+		pathcpy(tmpstr+1, path);
+	}
+
+	return 0;
+}
+
+	
+int
+file_detectfs(void)
+{
+	int i;
+
+	current_filesystem = FSTYPE_NONE;
+
+	for (i = 0; i < NUM_FILESYS; i++) {
+		if (filesystems[i].detect() == 0) {
+			strcpy(file_cwd, "/");
+			current_filesystem = i;
+			break;
+		}
+	}
+
+	return current_filesystem;
+}
+
+
+int
+file_ls(const char *dir)
+{
+	char fullpath[1024];
+	const char *arg;
+
+	if (current_filesystem == FSTYPE_NONE) {
+		printf("Can't list files without a filesystem!\n");
+		return -1;
+	}
+
+	if (ISDIRDELIM(*dir)) {
+		arg = dir;
+	} else {
+		sprintf(fullpath, "%s/%s", file_cwd, dir);
+		arg = fullpath;
+	}
+	return filesystems[current_filesystem].ls(arg);
+}
+
+
+long
+file_read(const char *filename, void *buffer, unsigned long maxsize)
+{
+	char fullpath[1024];
+	const char *arg;
+
+	if (current_filesystem == FSTYPE_NONE) {
+		printf("Can't load file without a filesystem!\n");
+		return -1;
+	}
+
+	if (ISDIRDELIM(*filename)) {
+		arg = filename;
+	} else {
+		sprintf(fullpath, "%s/%s", file_cwd, filename);
+		arg = fullpath;
+	}
+
+	return filesystems[current_filesystem].read(arg, buffer, maxsize);
+}
+
+#endif /* #if (CONFIG_COMMANDS & CFG_CMD_FAT) */