Index: bootcd/isolinux/syslinux-6.03/dos/syslinux.c
===================================================================
--- bootcd/isolinux/syslinux-6.03/dos/syslinux.c	(revision e16e8f2a41938d263af54a9fd6b4020d6c0d69fa)
+++ bootcd/isolinux/syslinux-6.03/dos/syslinux.c	(revision e16e8f2a41938d263af54a9fd6b4020d6c0d69fa)
@@ -0,0 +1,769 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 1998-2008 H. Peter Anvin - All Rights Reserved
+ *   Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
+ *
+ *   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, Inc., 53 Temple Place Ste 330,
+ *   Boston MA 02111-1307, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * syslinux.c - Linux installer program for SYSLINUX
+ *
+ * Hacked up for DOS.
+ */
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include "mystuff.h"
+
+#include "syslinux.h"
+#include "libfat.h"
+#include "setadv.h"
+#include "sysexits.h"
+#include "syslxopt.h"
+#include "syslxint.h"
+#include "syslxfs.h"
+
+char *program = "syslinux.com";		/* Name of program */
+uint16_t dos_version;
+
+#ifdef DEBUG
+# define dprintf printf
+void pause(void)
+{
+    uint16_t ax;
+
+    asm volatile("int $0x16" : "=a" (ax) : "a" (0));
+}
+#else
+# define dprintf(...) ((void)0)
+# define pause() ((void)0)
+#endif
+
+void unlock_device(int);
+
+void __attribute__ ((noreturn)) die(const char *msg)
+{
+    unlock_device(0);
+    puts("syslinux: ");
+    puts(msg);
+    putchar('\n');
+    exit(1);
+}
+
+void warning(const char *msg)
+{
+    puts("syslinux: warning: ");
+    puts(msg);
+    putchar('\n');
+}
+
+/*
+ * read/write wrapper functions
+ */
+int creat(const char *filename, int mode)
+{
+    uint16_t rv;
+    uint8_t err;
+
+    dprintf("creat(\"%s\", 0x%x)\n", filename, mode);
+
+    rv = 0x3C00;
+    asm volatile ("int $0x21 ; setc %0"
+		  : "=bcdm" (err), "+a" (rv)
+		  : "c" (mode), "d" (filename));
+    if (err) {
+	dprintf("rv = %d\n", rv);
+	die("cannot open ldlinux.sys");
+    }
+
+    return rv;
+}
+
+void close(int fd)
+{
+    uint16_t rv = 0x3E00;
+
+    dprintf("close(%d)\n", fd);
+
+    asm volatile ("int $0x21":"+a" (rv)
+		  :"b"(fd));
+
+    /* The only error MS-DOS returns for close is EBADF,
+       and we really don't care... */
+}
+
+int rename(const char *oldname, const char *newname)
+{
+    uint16_t rv = 0x5600;	/* Also support 43FFh? */
+    uint8_t err;
+
+    dprintf("rename(\"%s\", \"%s\")\n", oldname, newname);
+
+    asm volatile ("int $0x21 ; setc %0":"=bcdm" (err), "+a"(rv)
+		  :"d"(oldname), "D"(newname));
+
+    if (err) {
+	dprintf("rv = %d\n", rv);
+	warning("cannot move ldlinux.sys");
+	return rv;
+    }
+
+    return 0;
+}
+
+ssize_t write_file_sl(int fd, const unsigned char _slimg *buf,
+		      const unsigned int len)
+{
+    uint32_t filepos = 0;
+    uint16_t rv;
+    uint8_t err;
+
+    while (filepos < len) {
+	uint16_t seg = ((size_t)buf >> 4) + ds();
+	uint16_t offset = (size_t)buf & 15;
+	uint32_t chunk = len - filepos;
+	if (chunk > 32768 - offset)
+	    chunk = 32768 - offset;
+	asm volatile ("pushw %%ds ; "
+		      "movw %6,%%ds ; "
+		      "int $0x21 ; "
+		      "popw %%ds ; " "setc %0":"=bcdm" (err), "=a"(rv)
+		      :"a"(0x4000), "b"(fd), "c"(chunk), "d" (offset),
+		       "SD" (seg));
+	if (err || rv == 0)
+	    die("file write error");
+	filepos += rv;
+	buf += rv;
+    }
+
+    return filepos;
+}
+
+ssize_t write_file(int fd, const void *buf, size_t count)
+{
+    uint16_t rv;
+    ssize_t done = 0;
+    uint8_t err;
+
+    dprintf("write_file(%d,%p,%u)\n", fd, buf, count);
+
+    while (count) {
+	asm volatile ("int $0x21 ; setc %0":"=bcdm" (err), "=a"(rv)
+		      :"a"(0x4000), "b"(fd), "c"(count), "d"(buf));
+	if (err || rv == 0)
+	    die("file write error");
+
+	done += rv;
+	count -= rv;
+    }
+
+    return done;
+}
+
+void write_device(int drive, const void *buf, size_t nsecs, unsigned int sector)
+{
+    uint16_t errnum = 0x0001;
+    struct diskio dio;
+
+    dprintf("write_device(%d,%p,%u,%u)\n", drive, buf, nsecs, sector);
+
+    dio.startsector = sector;
+    dio.sectors = nsecs;
+    dio.bufoffs = (uintptr_t) buf;
+    dio.bufseg = ds();
+
+    if (dos_version >= 0x070a) {
+	/* Try FAT32-aware system call first */
+	asm volatile("int $0x21 ; jc 1f ; xorw %0,%0\n"
+		     "1:"
+		     : "=a" (errnum)
+		     : "a" (0x7305), "b" (&dio), "c" (-1), "d" (drive),
+		       "S" (1), "m" (dio)
+		     : "memory");
+	dprintf(" rv(7305) = %04x", errnum);
+    }
+
+    /* If not supported, try the legacy system call (int2526.S) */
+    if (errnum == 0x0001)
+	errnum = int26_write_sector(drive, &dio);
+
+    if (errnum) {
+	dprintf("rv = %04x\n", errnum);
+	die("sector write error");
+    }
+}
+
+void read_device(int drive, void *buf, size_t nsecs, unsigned int sector)
+{
+    uint16_t errnum = 0x0001;
+    struct diskio dio;
+
+    dprintf("read_device(%d,%p,%u,%u)\n", drive, buf, nsecs, sector);
+
+    dio.startsector = sector;
+    dio.sectors = nsecs;
+    dio.bufoffs = (uintptr_t) buf;
+    dio.bufseg = ds();
+
+    if (dos_version >= 0x070a) {
+	/* Try FAT32-aware system call first */
+	asm volatile("int $0x21 ; jc 1f ; xorw %0,%0\n"
+		     "1:"
+		     : "=a" (errnum)
+		     : "a" (0x7305), "b" (&dio), "c" (-1), "d" (drive),
+		       "S" (0), "m" (dio));
+	dprintf(" rv(7305) = %04x", errnum);
+    }
+
+    /* If not supported, try the legacy system call (int2526.S) */
+    if (errnum == 0x0001)
+	errnum = int25_read_sector(drive, &dio);
+
+    if (errnum) {
+	dprintf("rv = %04x\n", errnum);
+	die("sector read error");
+    }
+}
+
+/* Both traditional DOS and FAT32 DOS return this structure, but
+   FAT32 return a lot more data, so make sure we have plenty of space */
+struct deviceparams {
+    uint8_t specfunc;
+    uint8_t devtype;
+    uint16_t devattr;
+    uint16_t cylinders;
+    uint8_t mediatype;
+    uint16_t bytespersec;
+    uint8_t secperclust;
+    uint16_t ressectors;
+    uint8_t fats;
+    uint16_t rootdirents;
+    uint16_t sectors;
+    uint8_t media;
+    uint16_t fatsecs;
+    uint16_t secpertrack;
+    uint16_t heads;
+    uint32_t hiddensecs;
+    uint32_t hugesectors;
+    uint8_t lotsofpadding[224];
+} __attribute__ ((packed));
+
+uint32_t get_partition_offset(int drive)
+{
+    uint8_t err;
+    uint16_t rv;
+    struct deviceparams dp;
+
+    dp.specfunc = 1;		/* Get current information */
+
+    rv = 0x440d;
+    asm volatile ("int $0x21 ; setc %0"
+		  :"=abcdm" (err), "+a"(rv), "=m"(dp)
+		  :"b" (drive), "c" (0x0860), "d" (&dp));
+
+    if (!err)
+	return dp.hiddensecs;
+
+    rv = 0x440d;
+    asm volatile ("int $0x21 ; setc %0"
+		  : "=abcdm" (err), "+a" (rv), "=m" (dp)
+		  : "b" (drive), "c" (0x4860), "d" (&dp));
+
+    if (!err)
+	return dp.hiddensecs;
+
+    die("could not find partition start offset");
+}
+
+struct rwblock {
+    uint8_t special;
+    uint16_t head;
+    uint16_t cylinder;
+    uint16_t firstsector;
+    uint16_t sectors;
+    uint16_t bufferoffset;
+    uint16_t bufferseg;
+} __attribute__ ((packed));
+
+static struct rwblock mbr = {
+    .special = 0,
+    .head = 0,
+    .cylinder = 0,
+    .firstsector = 0,		/* MS-DOS, unlike the BIOS, zero-base sectors */
+    .sectors = 1,
+    .bufferoffset = 0,
+    .bufferseg = 0
+};
+
+void write_mbr(int drive, const void *buf)
+{
+    uint16_t rv;
+    uint8_t err;
+
+    dprintf("write_mbr(%d,%p)", drive, buf);
+
+    mbr.bufferoffset = (uintptr_t) buf;
+    mbr.bufferseg = ds();
+
+    rv = 0x440d;
+    asm volatile ("int $0x21 ; setc %0" : "=bcdm" (err), "+a"(rv)
+		  :"c"(0x0841), "d"(&mbr), "b"(drive), "m"(mbr));
+
+    dprintf(" rv(0841) = %04x", rv);
+    if (!err) {
+	dprintf("\n");
+	return;
+    }
+
+    rv = 0x440d;
+    asm volatile ("int $0x21 ; setc %0" : "=bcdm" (err), "+a"(rv)
+		  :"c"(0x4841), "d"(&mbr), "b"(drive), "m"(mbr));
+
+    dprintf(" rv(4841) = %04x\n", rv);
+    if (err)
+	die("mbr write error");
+}
+
+void read_mbr(int drive, const void *buf)
+{
+    uint16_t rv;
+    uint8_t err;
+
+    dprintf("read_mbr(%d,%p)", drive, buf);
+
+    mbr.bufferoffset = (uintptr_t) buf;
+    mbr.bufferseg = ds();
+
+    rv = 0x440d;
+    asm volatile ("int $0x21 ; setc %0":"=abcdm" (err), "+a"(rv)
+		  :"c"(0x0861), "d"(&mbr), "b"(drive), "m"(mbr));
+
+    dprintf(" rv(0861) = %04x", rv);
+    if (!err) {
+	dprintf("\n");
+	return;
+    }
+
+    rv = 0x440d;
+    asm volatile ("int $0x21 ; setc %0":"=abcdm" (err), "+a"(rv)
+		  :"c"(0x4861), "d"(&mbr), "b"(drive), "m"(mbr));
+
+    dprintf(" rv(4841) = %04x\n", rv);
+    if (err)
+	die("mbr read error");
+
+    dprintf("Bytes: %02x %02x %02x %02x %02x %02x %02x %02x\n",
+	    ((const uint8_t *)buf)[0],
+	    ((const uint8_t *)buf)[1],
+	    ((const uint8_t *)buf)[2],
+	    ((const uint8_t *)buf)[3],
+	    ((const uint8_t *)buf)[4],
+	    ((const uint8_t *)buf)[5],
+	    ((const uint8_t *)buf)[6],
+	    ((const uint8_t *)buf)[7]);
+}
+
+/* This call can legitimately fail, and we don't care, so ignore error return */
+void set_attributes(const char *file, int attributes)
+{
+    uint16_t rv = 0x4301;
+
+    dprintf("set_attributes(\"%s\", 0x%02x)\n", file, attributes);
+
+    asm volatile ("int $0x21":"+a" (rv)
+		  :"c"(attributes), "d"(file));
+}
+
+/*
+ * Version of the read_device function suitable for libfat
+ */
+int libfat_xpread(intptr_t pp, void *buf, size_t secsize,
+		  libfat_sector_t sector)
+{
+    read_device(pp, buf, 1, sector);
+    return secsize;
+}
+
+static inline void get_dos_version(void)
+{
+    dprintf("DOS version %d.%d\n", (dos_version >> 8), dos_version & 0xff);
+}
+
+/* The locking interface relies on static variables.  A massive hack :( */
+static uint8_t lock_level, lock_drive;
+
+static inline void set_lock_device(uint8_t device)
+{
+    lock_level  = 0;
+    lock_drive = device;
+}
+
+static int do_lock(uint8_t level)
+{
+    uint16_t level_arg = lock_drive + (level << 8);
+    uint16_t rv;
+    uint8_t err;
+#if 0
+    /* DOS 7.10 = Win95 OSR2 = first version with FAT32 */
+    uint16_t lock_call = (dos_version >= 0x070a) ? 0x484A : 0x084A;
+#else
+    uint16_t lock_call = 0x084A; /* MSDN says this is OK for all filesystems */
+#endif
+
+    dprintf("Trying lock %04x... ", level_arg);
+    asm volatile ("int $0x21 ; setc %0"
+		  : "=bcdm" (err), "=a" (rv)
+		  : "a" (0x440d), "b" (level_arg),
+		    "c" (lock_call), "d" (0x0001));
+    dprintf("%s %04x\n", err ? "err" : "ok", rv);
+
+    return err ? rv : 0;
+}
+
+void lock_device(int level)
+{
+    static int hard_lock = 0;
+    int err;
+
+    if (dos_version < 0x0700)
+	return;			/* Win9x/NT only */
+
+    if (!hard_lock) {
+	/* Assume hierarchial "soft" locking supported */
+
+	while (lock_level < level) {
+	    int new_level = lock_level + 1;
+	    err = do_lock(new_level);
+	    if (err) {
+		if (err == 0x0001) {
+		    /* Try hard locking next */
+		    hard_lock = 1;
+		}
+		goto soft_fail;
+	    }
+
+	    lock_level = new_level;
+	}
+	return;
+    }
+
+soft_fail:
+    if (hard_lock) {
+	/* Hard locking, only level 4 supported */
+	/* This is needed for Win9x in DOS mode */
+
+	err = do_lock(4);
+	if (err) {
+	    if (err == 0x0001) {
+		/* Assume locking is not needed */
+		return;
+	    }
+	    goto hard_fail;
+	}
+
+	lock_level = 4;
+	return;
+    }
+
+hard_fail:
+    die("could not lock device");
+}
+
+void unlock_device(int level)
+{
+    uint16_t rv;
+    uint8_t err;
+    uint16_t unlock_call;
+
+    if (dos_version < 0x0700)
+	return;			/* Win9x/NT only */
+
+#if 0
+    /* DOS 7.10 = Win95 OSR2 = first version with FAT32 */
+    unlock_call = (dos_version >= 0x070a) ? 0x486A : 0x086A;
+#else
+    unlock_call = 0x086A;	/* MSDN says this is OK for all filesystems */
+#endif
+
+    if (lock_level == 4 && level > 0)
+	return;			/* Only drop the hard lock at the end */
+
+    while (lock_level > level) {
+	uint8_t new_level = (lock_level == 4) ? 0 : lock_level - 1;
+	uint16_t level_arg = (new_level << 8) + lock_drive;
+	rv = 0x440d;
+	dprintf("Trying unlock %04x... ", new_level);
+	asm volatile ("int $0x21 ; setc %0"
+		      : "=bcdm" (err), "+a" (rv)
+		      : "b" (level_arg), "c" (unlock_call));
+	dprintf("%s %04x\n", err ? "err" : "ok", rv);
+	lock_level = new_level;
+    }
+}
+
+/*
+ * This function does any desired MBR manipulation; called with the device lock held.
+ */
+struct mbr_entry {
+    uint8_t active;		/* Active flag */
+    uint8_t bhead;		/* Begin head */
+    uint8_t bsector;		/* Begin sector */
+    uint8_t bcylinder;		/* Begin cylinder */
+    uint8_t filesystem;		/* Filesystem value */
+    uint8_t ehead;		/* End head */
+    uint8_t esector;		/* End sector */
+    uint8_t ecylinder;		/* End cylinder */
+    uint32_t startlba;		/* Start sector LBA */
+    uint32_t sectors;		/* Length in sectors */
+} __attribute__ ((packed));
+
+static void adjust_mbr(int device, int writembr, int set_active)
+{
+    static unsigned char sectbuf[SECTOR_SIZE];
+    int i;
+
+    if (!writembr && !set_active)
+	return;			/* Nothing to do */
+
+    read_mbr(device, sectbuf);
+
+    if (writembr) {
+	memcpy(sectbuf, syslinux_mbr, syslinux_mbr_len);
+	*(uint16_t *) (sectbuf + 510) = 0xaa55;
+    }
+
+    if (set_active) {
+	uint32_t offset = get_partition_offset(device);
+	struct mbr_entry *me = (struct mbr_entry *)(sectbuf + 446);
+	int found = 0;
+
+	dprintf("Searching for partition offset: %08x\n", offset);
+
+	for (i = 0; i < 4; i++) {
+	    if (me->startlba == offset) {
+		me->active = 0x80;
+		found++;
+	    } else {
+		me->active = 0;
+	    }
+	    me++;
+	}
+
+	if (found < 1) {
+	    die("partition not found (-a is not implemented for logical partitions)");
+	} else if (found > 1) {
+	    die("multiple aliased partitions found");
+	}
+    }
+
+    write_mbr(device, sectbuf);
+}
+
+static void move_file(int dev_fd, char *pathname, char *filename)
+{
+    char new_name[160];
+    char *cp = new_name + 3;
+    const char *sd;
+    int slash = 1;
+
+    new_name[0] = dev_fd | 0x40;
+    new_name[1] = ':';
+    new_name[2] = '\\';
+
+    for (sd = opt.directory; *sd; sd++) {
+	char c = *sd;
+
+	if (c == '/' || c == '\\') {
+	    if (slash)
+		continue;
+	    c = '\\';
+	    slash = 1;
+	} else {
+	    slash = 0;
+	}
+
+	*cp++ = c;
+    }
+
+    /* Skip if subdirectory == root */
+    if (cp > new_name + 3) {
+	if (!slash)
+	    *cp++ = '\\';
+
+	memcpy(cp, filename, 12);
+
+	set_attributes(pathname, 0);
+	if (rename(pathname, new_name))
+	    set_attributes(pathname, 0x07);
+	else
+	    set_attributes(new_name, 0x07);
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    static unsigned char sectbuf[SECTOR_SIZE];
+    int dev_fd, fd;
+    static char ldlinux_name[] = "@:\\ldlinux.sys";
+    static char ldlinuxc32_name[] = "@:\\ldlinux.c32";
+    struct libfat_filesystem *fs;
+    libfat_sector_t s, *secp;
+    libfat_sector_t *sectors;
+    int ldlinux_sectors;
+    int32_t ldlinux_cluster;
+    int nsectors;
+    const char *errmsg;
+    int i;
+    int patch_sectors;
+    unsigned char *dp;
+
+    dprintf("argv = %p\n", argv);
+    for (i = 0; i <= argc; i++)
+	dprintf("argv[%d] = %p = \"%s\"\n", i, argv[i], argv[i]);
+
+    get_dos_version();
+
+    argv[0] = program;
+    parse_options(argc, argv, MODE_SYSLINUX_DOSWIN);
+
+    if (!opt.device)
+	usage(EX_USAGE, MODE_SYSLINUX_DOSWIN);
+    if (opt.sectors || opt.heads || opt.reset_adv || opt.set_once
+	|| (opt.update_only > 0) || opt.menu_save || opt.offset) {
+	fprintf(stderr,
+		"At least one specified option not yet implemented"
+		" for this installer.\n");
+	exit(1);
+    }
+
+    /*
+     * Create an ADV in memory... this should be smarter.
+     */
+    syslinux_reset_adv(syslinux_adv);
+
+    /*
+     * Figure out which drive we're talking to
+     */
+    dev_fd = (opt.device[0] & ~0x20) - 0x40;
+    if (dev_fd < 1 || dev_fd > 26 || opt.device[1] != ':' || opt.device[2])
+	usage(EX_USAGE, MODE_SYSLINUX_DOSWIN);
+
+    set_lock_device(dev_fd);
+
+    lock_device(2);		/* Make sure we can lock the device */
+    read_device(dev_fd, sectbuf, 1, 0);
+    unlock_device(1);
+
+    /*
+     * Check to see that what we got was indeed an MS-DOS boot sector/superblock
+     */
+    if ((errmsg = syslinux_check_bootsect(sectbuf, NULL))) {
+	unlock_device(0);
+	puts(errmsg);
+	putchar('\n');
+	exit(1);
+    }
+
+    ldlinux_name[0] = dev_fd | 0x40;
+    ldlinuxc32_name[0] = dev_fd | 0x40;
+
+    set_attributes(ldlinux_name, 0);
+    fd = creat(ldlinux_name, 0);	/* SYSTEM HIDDEN READONLY */
+    write_file_sl(fd, syslinux_ldlinux, syslinux_ldlinux_len);
+    write_file(fd, syslinux_adv, 2 * ADV_SIZE);
+    close(fd);
+    set_attributes(ldlinux_name, 0x07);	/* SYSTEM HIDDEN READONLY */
+
+    set_attributes(ldlinuxc32_name, 0);
+    fd = creat(ldlinuxc32_name, 0);		/* SYSTEM HIDDEN READONLY */
+    write_file_sl(fd, syslinux_ldlinuxc32, syslinux_ldlinuxc32_len);
+    close(fd);
+    set_attributes(ldlinuxc32_name, 0x07);	/* SYSTEM HIDDEN READONLY */
+
+    /*
+     * Now, use libfat to create a block map.  This probably
+     * should be changed to use ioctl(...,FIBMAP,...) since
+     * this is supposed to be a simple, privileged version
+     * of the installer.
+     */
+    ldlinux_sectors = (syslinux_ldlinux_len + 2 * ADV_SIZE
+		       + SECTOR_SIZE - 1) >> SECTOR_SHIFT;
+    sectors = calloc(ldlinux_sectors, sizeof *sectors);
+    lock_device(2);
+    fs = libfat_open(libfat_xpread, dev_fd);
+    ldlinux_cluster = libfat_searchdir(fs, 0, "LDLINUX SYS", NULL);
+    secp = sectors;
+    nsectors = 0;
+    s = libfat_clustertosector(fs, ldlinux_cluster);
+    while (s && nsectors < ldlinux_sectors) {
+	*secp++ = s;
+	nsectors++;
+	s = libfat_nextsector(fs, s);
+    }
+    libfat_close(fs);
+
+    /*
+     * If requested, move ldlinux.sys
+     */
+    if (opt.directory) {
+	move_file(dev_fd, ldlinux_name, "ldlinux.sys");
+	move_file(dev_fd, ldlinuxc32_name, "ldlinux.c32");
+    }
+
+    /*
+     * Patch ldlinux.sys and the boot sector
+     */
+    i = syslinux_patch(sectors, nsectors, opt.stupid_mode, opt.raid_mode, opt.directory, NULL);
+    patch_sectors = (i + SECTOR_SIZE - 1) >> SECTOR_SHIFT;
+
+    /*
+     * Overwrite the now-patched ldlinux.sys
+     */
+    /* lock_device(3); -- doesn't seem to be needed */
+    dp = syslinux_ldlinux;
+    for (i = 0; i < patch_sectors; i++) {
+	memcpy_from_sl(sectbuf, dp, SECTOR_SIZE);
+	dp += SECTOR_SIZE;
+	write_device(dev_fd, sectbuf, 1, sectors[i]);
+    }
+
+    /*
+     * Muck with the MBR, if desired, while we hold the lock
+     */
+    adjust_mbr(dev_fd, opt.install_mbr, opt.activate_partition);
+
+    /*
+     * To finish up, write the boot sector
+     */
+
+    /* Read the superblock again since it might have changed while mounted */
+    read_device(dev_fd, sectbuf, 1, 0);
+
+    /* Copy the syslinux code into the boot sector */
+    syslinux_make_bootsect(sectbuf, VFAT);
+
+    /* Write new boot sector */
+    if (opt.bootsecfile) {
+	unlock_device(0);
+	fd = creat(opt.bootsecfile, 0x20);	/* ARCHIVE */
+	write_file(fd, sectbuf, SECTOR_SIZE);
+	close(fd);
+    } else {
+	write_device(dev_fd, sectbuf, 1, 0);
+	unlock_device(0);
+    }
+
+    /* Done! */
+
+    return 0;
+}
