4 :author: H. Peter Anvin
5 :author-email: hpa@zytor.com
7 :editor1-email: gene.cumm@gmail.com
8 :editor1-revlast: 2012-10-28
12 syslinux - Install SYSLINUX to a file system
17 *syslinux* ['OPTIONS'] 'DEVICE'
18 *extlinux* ['OPTIONS'] 'PATH'
19 *syslinux* [-h | --help]
20 *extlinux* [-h | --help]
24 Install *SYSLINUX* to the 'DEVICE'/'PATH', altering the boot sector and
25 installing the 'ldlinux.sys' boot loader file. For the Linux installer
26 extlinux, 'PATH' is the desired path for the control files on a mounted,
27 supported file system and sets the install-time working directory. For
28 all others, 'DEVICE' must specify a FAT12/FAT16/FAT32 file system. For
29 the Linux installers syslinux and syslinux-mtools, 'DEVICE' should be an
30 unmounted file system. For the DOS/Win32/Win64 installers, 'DEVICE'
31 should be a drive like 'a:' (case insensitive).
33 For versions ~4.00 and later, either -i/--install or -U/--update must be
34 specified unless modifying the ADV of an existing install (options
35 tagged with 'ADV') or requesting the help/usage or version info, .
37 If, during boot, the Shift or Alt keys are held down, or the Caps or
38 Scroll locks are set, *Syslinux* will display a *lilo*(8) -style "boot:"
39 prompt. The user can then type a kernel file name followed by any kernel
40 parameters. The *Syslinux* bootloader does not need to know about the
41 kernel or config files in advance.
43 *Syslinux* supports the loading of initial ramdisks (initrd) and the
44 bzImage kernel format.
46 Please note, the ldlinux.sys boot loader file is flagged as immutable
47 (where applicable) and is modified after copying in to help ensure
48 boot-time integrity. File systems with a sufficiently large boot loader
49 reserved area, like btrfs, will have ldlinux.sys installed there rather
50 than as a normal file.
54 // "See"/"See also" notes should reference long options.
55 === Standalone options ===
57 (~4.00+) Install SYSLINUX, regardless of an existing install.
60 (~4.00+) Update an existing SYSLINUX/EXTLINUX install. If no Syslinux
61 boot loader is present, return an error.
64 Display help/usage information.
67 Display version information and exit immediately.
69 === Regular Options ===
70 // Sorted generally by short argument
72 (DOS/Win32/Win64 ONLY) Mark the install target file system's partition
75 *-d*, *--directory* 'subdirectory'::
76 (Not necessary for extlinux as it is implied by 'PATH') Install the
77 *SYSLINUX* control files in a subdirectory with the specified name
78 (relative to the root directory on the device).
81 (extlinux ONLY; 4.06+) Force use of a specific block device (experts
85 Force install even if it appears unsafe. Before 4.00, -f was used for
86 --offset in the Linux installers.
88 *-H*, *--heads* 'head-count'::
89 Override the detected number of heads for the geometry. See also
93 (DOS/Win32/Win64 ONLY) Install the regular Syslinux MBR code to the MBR.
96 (4.00+; ADV) Set the label to select as default on the next boot.
98 *-o*, *--once* 'command'::
99 (ADV) Declare a boot command to be tried on the first boot only. The
100 use of *-o* for the Linux installers syslinux or syslinux-mtools has
101 been deprecated as of \~4.00 and is no longer valid as of ~4.02.
103 *-O*, *--clear-once*::
104 Clear the boot-once command. See also *--once*.
107 (ADV) RAID mode. If boot fails, tell the BIOS to boot the next device
108 in the boot sequence (usually the next hard disk) instead of stopping
109 with an error message. This is useful for RAID-1 booting.
112 (ADV) Reset auxilliary data vector.
114 *-S*, *--sectors* 'sector-count'::
115 Override the detected number of sectors for the geometry. See also
119 Install a "safe, slow and stupid" version of *SYSLINUX*. This version
120 may work on some very buggy BIOSes on which *SYSLINUX* would otherwise
121 fail. If you find a machine on which the -s option is required to make
122 it boot reliably, please send as much info about your machine as you
123 can, and include the failure mode.
125 *-t*, *--offset* 'offset'::
126 (Linux syslinux/syslinux-mtools ONLY) Indicates that the filesystem is
127 at an offset from the base of the device or file.
130 Assume zipdrive geometry ('--heads 64 --sectors 32'). See also *--head*
136 For booting DOS and other similar operating systems, there is an easy
137 and generally reliable solution to substitute in SYSLINUX as the primary
140 - Make a DOS-bootable disk; The following are possible commands:
145 - Copy the DOS boot sector off using Linux or copybs.com:
147 dd if=/dev/fd0 of=dos.bss bs=512 count=1
150 - Install SYSLINUX using one of:
153 syslinux /dev/fd0 (before 4.00)
154 syslinux -i /dev/fd0 (4.00+)
156 - For Linux, mount the disk and copy the dos.bss to the disk:
158 mount -t msdos /dev/fd0 /mnt
161 - Copy a Linux kernel image and initrd payload files:
169 - For Linux, umount the disk (if applicable):
174 In order to boot from a hard disk (or hard disk-like device) in BIOS
175 mode, an appropriate MBR boot block must also be installed in the MBR
176 (first sector or 512 bytes of the disk), occupying at most 440 bytes.
179 If using FDISK, FDISK or a similar application must also be used to mark
180 the partition as active.
188 dd bs=440 count=1 conv=notrunc if=mbr/mbr.bin of=/dev/sda
190 For altmbr.bin, an easy way to overwrite the MBR boot block and specify
191 the partion number is:
193 printf '\1' | cat altmbr.bin - | dd bs=440 count=1 iflag=fullblock conv=notrunc of=/dev/sda
195 Note: using 'cat' for writing the MBR can under some circumstances cause
196 data loss or overwritting. For this reason, using 'dd' is recommended
199 //[FIXME]: any clean way to handle the above long command for manpage?
203 *syslinux.cfg*(5), *syslinux-cli*(1), *lilo*(8), *keytab-lilo.pl*(8),
204 *fdisk*(8), *mkfs*(8), *superformat*(1).
208 This AsciiDoc derived document is a modified version of the original
209 *SYSLINUX* documentation by {author} <{author-email}>. The conversion to
210 a manpage was made by Arthur Korn <arthur@korn.ch>. The conversion to
211 an AsciiDoc was made by {editor1} <{editor1-email}>
215 Copyright \(C) 1994-2012 {author}. Free use of this software is granted
216 under the terms of the GNU General Public License (GPL), version 2
217 (GPLv2) (or, at your option, any later version).