path: root/doc/syslinux.txt
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authorH. Peter Anvin <hpa@zytor.com>2008-03-01 15:56:29 -0800
committerH. Peter Anvin <hpa@zytor.com>2008-03-01 15:56:29 -0800
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+ A suite of bootloaders for Linux
+ Copyright 1994-2008 H. Peter Anvin - All Rights Reserved
+This program is provided under the terms of the GNU General Public
+License, version 2 or, at your option, any later version. There is no
+warranty, neither expressed nor implied, to the function of this
+program. Please see the included file COPYING for details.
+ SYSLINUX now has a home page at http://syslinux.zytor.com/
+The SYSLINUX suite contains the following boot loaders
+("derivatives"), for their respective boot media:
+ SYSLINUX - MS-DOS/Windows FAT filesystem
+ PXELINUX - PXE network booting
+ EXTLINUX - Linux ext2/ext3 filesystem
+For historical reasons, some of the sections in this document applies
+to the FAT loader only; see pxelinux.txt, isolinux.txt and
+extlinux.txt for what differs in these versions.
+Help with cleaning up the docs would be greatly appreciated.
+ ++++ Options ++++
+These are the options common to all versions of Syslinux:
+ -s Safe, slow, stupid; uses simpler code that boots better
+ -f Force installing
+These are only in the Windows version:
+ -m Mbr; install a bootable MBR sector to the beginning of the
+ drive.
+ -a Active; marks the partition used active (=bootable)
+In order to create a bootable Linux floppy using SYSLINUX, prepare a
+normal MS-DOS formatted floppy. Copy one or more Linux kernel files to
+it, then execute the DOS command:
+ syslinux [-sfma][-d directory] a:
+(or whichever drive letter is appropriate; the [] meaning optional.)
+Use "syslinux.com" (in the dos subdirectory of the distribution) for
+plain DOS (MS-DOS, DR-DOS, PC-DOS, FreeDOS...) or Win9x/ME.
+Use "syslinux.exe" (in the win32 subdirectory of the distribution) for
+Under Linux, execute the command:
+ syslinux [-sf][-d directory][-o offset] /dev/fd0
+(or, again, whichever device is the correct one.)
+This will alter the boot sector on the disk and copy a file named
+LDLINUX.SYS into its root directory (or a subdirectory, if the -d
+option is specified.)
+The -s option, if given, will install a "safe, slow and stupid"
+version of SYSLINUX. This version may work on some very buggy BIOSes
+on which SYSLINUX would otherwise fail. If you find a machine on
+which the -s option is required to make it boot reliably, please send
+as much info about your machine as you can, and include the failure
+The -o option is used with a disk image file and specifies the byte
+offset of the filesystem image in the file.
+For the DOS and Windows installers, the -m and -a options can be used
+on hard drives to write a Master Boot Record (MBR), and to mark the
+specific partition active.
+On boot time, by default, the kernel will be loaded from the image named
+LINUX on the boot floppy. This default can be changed, see the section
+on the SYSLINUX config file.
+If the Shift or Alt keys are held down during boot, or the Caps or Scroll
+locks are set, SYSLINUX will display a LILO-style "boot:" prompt. The
+user can then type a kernel file name followed by any kernel parameters.
+The SYSLINUX loader does not need to know about the kernel file in
+advance; all that is required is that it is a file located in the root
+directory on the disk.
+There are two versions of the Linux installer; one in the "mtools"
+directory which requires no special privilege (other than write
+permission to the device where you are installing) but requires the
+mtools program suite to be available, and one in the "unix" directory
+which requires root privilege.
+All the configurable defaults in SYSLINUX can be changed by putting a
+file called "syslinux.cfg" in the root directory of the boot disk.
+This is a text file in either UNIX or DOS format, containing one or
+more of the following items (case is insensitive for keywords; upper
+case is used here to indicate that a word should be typed verbatim):
+Starting with version 3.35, the configuration file can also be in
+either the /boot/syslinux or /syslinux directories (searched in that
+order.) If that is the case, then all filenames are assumed to be
+relative to that same directory, unless preceded with a slash or
+All options here applies to PXELINUX, ISOLINUX and EXTLINUX as well as
+SYSLINUX unless otherwise noted. See the respective .txt files.
+# comment
+ A comment line. The whitespace after the hash mark is mandatory.
+INCLUDE filename
+ Inserts the contents of another file at this point in the
+ configuration file. Files can currently be nested up to 16
+ levels deep, but it is not guaranteed that more than 8 levels
+ will be supported in the future.
+DEFAULT kernel options...
+ Sets the default command line. If SYSLINUX boots automatically,
+ it will act just as if the entries after DEFAULT had been typed
+ in at the "boot:" prompt.
+ If no configuration file is present, or no DEFAULT entry is
+ present in the config file, the default is "linux auto".
+ NOTE: Earlier versions of SYSLINUX used to automatically
+ append the string "auto" to whatever the user specified using
+ the DEFAULT command. As of version 1.54, this is no longer
+ true, as it caused problems when using a shell as a substitute
+ for "init." You may want to include this option manually.
+APPEND options...
+ Add one or more options to the kernel command line. These are
+ added both for automatic and manual boots. The options are
+ added at the very beginning of the kernel command line,
+ usually permitting explicitly entered kernel options to override
+ them. This is the equivalent of the LILO "append" option.
+IPAPPEND flag_val [PXELINUX only]
+ The IPAPPEND option is available only on PXELINUX. The
+ flag_val is an OR of the following options:
+ 1: indicates that an option of the following format
+ should be generated and added to the kernel command line:
+ ip=<client-ip>:<boot-server-ip>:<gw-ip>:<netmask>
+ ... based on the input from the DHCP/BOOTP or PXE boot server.
+ it, it is probably an indication that your network configuration
+ is broken. Using just "ip=dhcp" on the kernel command line
+ is a preferrable option, or, better yet, run dhcpcd/dhclient,
+ from an initrd if necessary.
+ 2: indicates that an option of the following format
+ should be generated and added to the kernel command line:
+ BOOTIF=<hardware-address-of-boot-interface>
+ ... in dash-separated hexadecimal with leading hardware type
+ (same as for the configuration file; see pxelinux.txt.)
+ This allows an initrd program to determine from which
+ interface the system booted.
+LABEL label
+ KERNEL image
+ APPEND options...
+ IPAPPEND flag_val [PXELINUX only]
+ Indicates that if "label" is entered as the kernel to boot,
+ SYSLINUX should instead boot "image", and the specified APPEND
+ and IPAPPEND options should be used instead of the ones
+ specified in the global section of the file (before the first
+ LABEL command.) The default for "image" is the same as
+ "label", and if no APPEND is given the default is to use the
+ global entry (if any).
+ Starting with version 2.20, LABEL statements are compressed
+ internally, therefore the maximum number of LABEL statements
+ depends on their complexity. Typical is around 600. SYSLINUX
+ will print an error message if the internal memory for labels
+ is overrun.
+ Note that LILO uses the syntax:
+ image = mykernel
+ label = mylabel
+ append = "myoptions"
+ ... whereas SYSLINUX uses the syntax:
+ label mylabel
+ kernel mykernel
+ append myoptions
+ Note: The "kernel" doesn't have to be a Linux kernel; it can
+ be a boot sector or a COMBOOT file (see below.)
+ Since version 3.32 label names are no longer mangled into DOS
+ format (for SYSLINUX.)
+ LINUX image - Linux kernel image (default)
+ BOOT image - Bootstrap program (.bs, .bin)
+ BSS image - BSS image (.bss)
+ PXE image - PXE Network Bootstrap Program (.0)
+ FDIMAGE image - Floppy disk image (.img)
+ COMBOOT image - COMBOOT program (.com, .cbt)
+ COM32 image - COM32 program (.c32)
+ CONFIG image - New configuration file
+ Using one of these keywords instead of KERNEL forces the
+ filetype, regardless of the filename.
+ CONFIG means restart the boot loader using a different
+ configuration file.
+ Append nothing. APPEND with a single hyphen as argument in a
+ LABEL section can be used to override a global APPEND.
+ On PXELINUX, specifying "LOCALBOOT 0" instead of a "KERNEL"
+ option means invoking this particular label will cause a local
+ disk boot instead of booting a kernel.
+ The argument 0 means perform a normal boot. The argument 4
+ will perform a local boot with the Universal Network Driver
+ Interface (UNDI) driver still resident in memory. Finally,
+ the argument 5 will perform a local boot with the entire PXE
+ stack, including the UNDI driver, still resident in memory.
+ All other values are undefined. If you don't know what the
+ UNDI or PXE stacks are, don't worry -- you don't want them,
+ just specify 0.
+ On ISOLINUX, the "type" specifies the local drive number to
+ boot from; 0x00 is the primary floppy drive and 0x80 is the
+ primary hard drive. The special value -1 causes ISOLINUX to
+ report failure to the BIOS, which, on recent BIOSes, should
+ mean that the next boot device in the boot sequence should be
+ activated.
+IMPLICIT flag_val
+ If flag_val is 0, do not load a kernel image unless it has been
+ explicitly named in a LABEL statement. The default is 1.
+ If flag_val is 0, the user is not allowed to specify any
+ arguments on the kernel command line. The only options
+ recognized are those specified in an APPEND statement. The
+ default is 1.
+TIMEOUT timeout
+ Indicates how long to wait at the boot: prompt until booting
+ automatically, in units of 1/10 s. The timeout is cancelled as
+ soon as the user types anything on the keyboard, the assumption
+ being that the user will complete the command line already
+ begun. A timeout of zero will disable the timeout completely,
+ this is also the default.
+ Indicates how long to wait until booting automatically, in
+ units of 1/10 s. This timeout is *not* cancelled by user
+ input, and can thus be used to deal with serial port glitches
+ or "the user walked away" type situations. A timeout of zero
+ will disable the timeout completely, this is also the default.
+ Both TIMEOUT and TOTALTIMEOUT can be used together, for
+ example:
+ # Wait 5 seconds unless the user types something, but
+ # always boot after 15 minutes.
+ONTIMEOUT kernel options...
+ Sets the command line invoked on a timeout. Normally this is
+ the same thing as invoked by "DEFAULT". If this is specified,
+ then "DEFAULT" is used only if the user presses <Enter> to
+ boot.
+ONERROR kernel options...
+ If a kernel image is not found (either due to it not existing,
+ or because IMPLICIT is set), run the specified command. The
+ faulty command line is appended to the specified options, so
+ if the ONERROR directive reads as:
+ ONERROR xyzzy plugh
+ ... and the command line as entered by the user is:
+ foo bar baz
+ ... SYSLINUX will execute the following as if entered by the
+ user:
+ xyzzy plugh foo bar baz
+SERIAL port [[baudrate] flowcontrol]
+ Enables a serial port to act as the console. "port" is a
+ number (0 = /dev/ttyS0 = COM1, etc.) or an I/O port address
+ (e.g. 0x3F8); if "baudrate" is omitted, the baud rate defaults
+ to 9600 bps. The serial parameters are hardcoded to be 8
+ bits, no parity, 1 stop bit.
+ "flowcontrol" is a combination of the following bits:
+ 0x001 - Assert DTR
+ 0x002 - Assert RTS
+ 0x010 - Wait for CTS assertion
+ 0x020 - Wait for DSR assertion
+ 0x040 - Wait for RI assertion
+ 0x080 - Wait for DCD assertion
+ 0x100 - Ignore input unless CTS asserted
+ 0x200 - Ignore input unless DSR asserted
+ 0x400 - Ignore input unless RI asserted
+ 0x800 - Ignore input unless DCD asserted
+ All other bits are reserved.
+ Typical values are:
+ 0 - No flow control (default)
+ 0x303 - Null modem cable detect
+ 0x013 - RTS/CTS flow control
+ 0x813 - RTS/CTS flow control, modem input
+ 0x023 - DTR/DSR flow control
+ 0x083 - DTR/DCD flow control
+ For the SERIAL directive to be guaranteed to work properly, it
+ should be the first directive in the configuration file.
+ NOTE: "port" values from 0 to 3 means the first four serial
+ ports detected by the BIOS. They may or may not correspond to
+ the legacy port values 0x3F8, 0x2F8, 0x3E8, 0x2E8.
+CONSOLE flag_val
+ If flag_val is 0, disable output to the normal video console.
+ If flag_val is 1, enable output to the video console (this is
+ the default.)
+ Some BIOSes try to forward this to the serial console and
+ sometimes make a total mess thereof, so this option lets you
+ disable the video console on these systems.
+FONT filename
+ Load a font in .psf format before displaying any output
+ (except the copyright line, which is output as ldlinux.sys
+ itself is loaded.) SYSLINUX only loads the font onto the
+ video card; if the .psf file contains a Unicode table it is
+ ignored. This only works on EGA and VGA cards; hopefully it
+ should do nothing on others.
+KBDMAP keymap
+ Install a simple keyboard map. The keyboard remapper used is
+ *very* simplistic (it simply remaps the keycodes received from
+ the BIOS, which means that only the key combinations relevant
+ in the default layout -- usually U.S. English -- can be
+ mapped) but should at least help people with AZERTY keyboard
+ layout and the locations of = and , (two special characters
+ used heavily on the Linux kernel command line.)
+ The included program keytab-lilo.pl from the LILO distribution
+ can be used to create such keymaps. The file keytab-lilo.txt
+ contains the documentation for this program.
+DISPLAY filename
+ Displays the indicated file on the screen at boot time (before
+ the boot: prompt, if displayed). Please see the section below
+ on DISPLAY files.
+ NOTE: If the file is missing, this option is simply ignored.
+SAY message
+ Prints the message on the screen.
+PROMPT flag_val
+ If flag_val is 0, display the boot: prompt only if the Shift or Alt
+ key is pressed, or Caps Lock or Scroll lock is set (this is the
+ default). If flag_val is 1, always display the boot: prompt.
+NOESCAPE flag_val
+ If flag_val is set to 1, ignore the Shift/Alt/Caps Lock/Scroll
+ Lock escapes. Use this (together with PROMPT 0) to force the
+ default boot alternative.
+F1 filename
+F2 filename
+ ...etc...
+F9 filename
+F10 filename
+F11 filename
+F11 filename
+ Displays the indicated file on the screen when a function key is
+ pressed at the boot: prompt. This can be used to implement
+ pre-boot online help (presumably for the kernel command line
+ options.) Please see the section below on DISPLAY files.
+ When using the serial console, press <Ctrl-F><digit> to get to
+ the help screens, e.g. <Ctrl-F><2> to get to the F2 screen.
+ For F10-F12, hit <Ctrl-F><A>, <Ctrl-F>B, <Ctrl-F>C. For
+ compatiblity with earlier versions, F10 can also be entered as
+ <Ctrl-F>0.
+Blank lines are ignored.
+Note that the configuration file is not completely decoded. Syntax
+different from the one described above may still work correctly in this
+version of SYSLINUX, but may break in a future one.
+DISPLAY and function-key help files are text files in either DOS or UNIX
+format (with or without <CR>). In addition, the following special codes
+are interpreted:
+<FF> <FF> = <Ctrl-L> = ASCII 12
+ Clear the screen, home the cursor. Note that the screen is
+ filled with the current display color.
+<SI><bg><fg> <SI> = <Ctrl-O> = ASCII 15
+ Set the display colors to the specified background and
+ foreground colors, where <bg> and <fg> are hex digits,
+ corresponding to the standard PC display attributes:
+ 0 = black 8 = dark grey
+ 1 = dark blue 9 = bright blue
+ 2 = dark green a = bright green
+ 3 = dark cyan b = bright cyan
+ 4 = dark red c = bright red
+ 5 = dark purple d = bright purple
+ 6 = brown e = yellow
+ 7 = light grey f = white
+ Picking a bright color (8-f) for the background results in the
+ corresponding dark color (0-7), with the foreground flashing.
+ Colors are not visible over the serial console.
+<CAN>filename<newline> <CAN> = <Ctrl-X> = ASCII 24
+ If a VGA display is present, enter graphics mode and display
+ the graphic included in the specified file. The file format
+ is an ad hoc format called LSS16; the included Perl program
+ "ppmtolss16" can be used to produce these images. This Perl
+ program also includes the file format specification.
+ The image is displayed in 640x480 16-color mode. Once in
+ graphics mode, the display attributes (set by <SI> code
+ sequences) work slightly differently: the background color is
+ ignored, and the foreground colors are the 16 colors specified
+ in the image file. For that reason, ppmtolss16 allows you to
+ specify that certain colors should be assigned to specific
+ color indicies.
+ Color indicies 0 and 7, in particular, should be chosen with
+ care: 0 is the background color, and 7 is the color used for
+ the text printed by SYSLINUX itself.
+<EM> <EM> = <Ctrl-Y> = ASCII 25
+ If we are currently in graphics mode, return to text mode.
+<DLE>..<ETB> <Ctrl-P>..<Ctrl-W> = ASCII 16-23
+ These codes can be used to select which modes to print a
+ certain part of the message file in. Each of these control
+ characters select a specific set of modes (text screen,
+ graphics screen, serial port) for which the output is actually
+ displayed:
+ Character Text Graph Serial
+ ------------------------------------------------------
+ <DLE> = <Ctrl-P> = ASCII 16 No No No
+ <DC1> = <Ctrl-Q> = ASCII 17 Yes No No
+ <DC2> = <Ctrl-R> = ASCII 18 No Yes No
+ <DC3> = <Ctrl-S> = ASCII 19 Yes Yes No
+ <DC4> = <Ctrl-T> = ASCII 20 No No Yes
+ <NAK> = <Ctrl-U> = ASCII 21 Yes No Yes
+ <SYN> = <Ctrl-V> = ASCII 22 No Yes Yes
+ <ETB> = <Ctrl-W> = ASCII 23 Yes Yes Yes
+ For example:
+ <DC1>Text mode<DC2>Graphics mode<DC4>Serial port<ETB>
+ ... will actually print out which mode the console is in!
+<SUB> <SUB> = <Ctrl-Z> = ASCII 26
+ End of file (DOS convention).
+<BEL> <BEL> = <Ctrl-G> = ASCII 7
+ Beep the speaker.
+The command line prompt supports the following keystrokes:
+<Enter> boot specified command line
+<BackSpace> erase one character
+<Ctrl-U> erase the whole line
+<Ctrl-V> display the current SYSLINUX version
+<Ctrl-W> erase one word
+<Ctrl-X> force text mode
+<F1>..<F10> help screens (if configured)
+<Ctrl-F><digit> equivalent to F1..F10
+<Ctrl-C> interrupt boot in progress
+<Esc> interrupt boot in progress
+This version of SYSLINUX supports chain loading of other operating
+systems (such as MS-DOS and its derivatives, including Windows 95/98),
+as well as COMBOOT-style standalone executables (a subset of DOS .COM
+files; see separate section below.)
+Chain loading requires the boot sector of the foreign operating system
+to be stored in a file in the root directory of the filesystem.
+Because neither Linux kernels, boot sector images, nor COMBOOT files
+have reliable magic numbers, SYSLINUX will look at the file extension.
+The following extensions are recognized (case insensitive):
+ none or other Linux kernel image
+ .0 PXE bootstrap program (NBP) [PXELINUX only]
+ .bin "CD boot sector" [ISOLINUX only]
+ .bs Boot sector [SYSLINUX only]
+ .bss Boot sector, DOS superblock will be patched in [SYSLINUX only]
+ .c32 COM32 image (32-bit COMBOOT)
+ .cbt COMBOOT image (not runnable from DOS)
+ .com COMBOOT image (runnable from DOS)
+ .img Disk image [ISOLINUX only]
+For filenames given on the command line, SYSLINUX will search for the
+file by adding extensions in the order listed above if the plain
+filename is not found. Filenames in KERNEL statements must be fully
+If this is specified with one of the keywords LINUX, BOOT, BSS,
+FDIMAGE, COMBOOT, COM32, or CONFIG instead of KERNEL, the filetype is
+considered to be the one specified regardless of the filename.
+This section applies to SYSLINUX only, not to PXELINUX or ISOLINUX.
+See isolinux.txt for an equivalent procedure for ISOLINUX.
+This is the recommended procedure for creating a SYSLINUX disk that
+can boot either DOS or Linux. This example assumes the drive is A: in
+DOS and /dev/fd0 in Linux; for other drives, substitute the
+appropriate drive designator.
+ ---- Linux procedure ----
+1. Make a DOS bootable disk. This can be done either by specifying
+ the /s option when formatting the disk in DOS, or by running the
+ DOS command SYS (this can be done under DOSEMU if DOSEMU has
+ direct device access to the relevant drive):
+ format a: /s
+ or
+ sys a:
+2. Boot Linux. Copy the DOS boot sector from the disk into a file:
+ dd if=/dev/fd0 of=dos.bss bs=512 count=1
+3. Run SYSLINUX on the disk:
+ syslinux /dev/fd0
+4. Mount the disk and copy the DOS boot sector file to it. The file
+ *must* have extension .bss:
+ mount -t msdos /dev/fd0 /mnt
+ cp dos.bss /mnt
+5. Copy the Linux kernel image(s), initrd(s), etc to the disk, and
+ create/edit syslinux.cfg and help files if desired:
+ cp vmlinux /mnt
+ cp initrd.gz /mnt
+6. Unmount the disk (if applicable.)
+ umount /mnt
+ ---- DOS/Windows procedure ----
+To make this installation in DOS only, you need the utility copybs.com
+(included with SYSLINUX) as well as the syslinux.com installer. If
+you are on an WinNT-based system (WinNT, Win2k, WinXP or later), use
+syslinux.exe instead.
+1. Make a DOS bootable disk. This can be done either by specifying
+ the /s option when formatting the disk in DOS, or by running the
+ DOS command SYS:
+ format a: /s
+ or
+ sys a:
+2. Copy the DOS boot sector from the disk into a file. The file
+ *must* have extension .bss:
+ copybs a: a:dos.bss
+3. Run SYSLINUX on the disk:
+ syslinux a:
+4. Copy the Linux kernel image(s), initrd(s), etc to the disk, and
+ create/edit syslinux.cfg and help files if desired:
+ copy vmlinux a:
+ copy initrd.gz a:
+SYSLINUX supports simple standalone programs, using a file format
+similar to DOS ".com" files. A 32-bit version, called COM32, is also
+provided. A simple API provides access to a limited set of filesystem
+and console functions.
+See the file comboot.txt for more information on COMBOOT and COM32
+SYSLINUX will attempt to detect booting on a machine with too little
+memory, which means the Linux boot sequence cannot complete. If so, a
+message is displayed and the boot sequence aborted. Holding down the
+Ctrl key while booting disables this feature.
+Any file that SYSLINUX uses can be marked hidden, system or readonly
+if so is convenient; SYSLINUX ignores all file attributes. The
+SYSLINUX installed automatically sets the readonly/hidden/system
+attributes on LDLINUX.SYS.
+SYSLINUX can be used to create bootdisk images for El
+Torito-compatible bootable CD-ROMs. However, it appears that many
+BIOSes are very buggy when it comes to booting CD-ROMs. Some users
+have reported that the following steps are helpful in making a CD-ROM
+that is bootable on the largest possible number of machines:
+ a) Use the -s (safe, slow and stupid) option to SYSLINUX;
+ b) Put the boot image as close to the beginning of the
+ ISO 9660 filesystem as possible.
+A CD-ROM is so much faster than a floppy that the -s option shouldn't
+matter from a speed perspective.
+Of course, you probably want to use ISOLINUX instead. See isolinux.txt.
+SYSLINUX can boot from a FAT filesystem partition on a hard disk
+(including FAT32). The installation procedure is identical to the
+procedure for installing it on a floppy, and should work under either
+DOS or Linux. To boot from a partition, SYSLINUX needs to be launched
+from a Master Boot Record or another boot loader, just like DOS itself
+Under DOS, you can install a standard simple MBR on the primary hard
+disk by running the command:
+Then use the FDISK command to mark the appropriate partition active.
+A simple MBR, roughly on par with the one installed by DOS (but
+unencumbered), is included in the SYSLINUX distribution. To install
+it under Linux, simply type:
+ cat mbr.bin > /dev/XXX
+... where /dev/XXX is the device you wish to install it on.
+Under DOS or Win32, you can install the SYSLINUX MBR with the -m
+option to the SYSLINUX installer, and use the -a option to mark the
+current partition active:
+ syslinux -ma c:
+Note that this will also install SYSLINUX on the specified partition.
+I have started to maintain a web page of hardware with known
+problems. There are, unfortunately, lots of broken hardware out
+there; especially early PXE stacks (for PXELINUX) have lots of
+A list of problems, and workarounds (if known), is maintained at:
+ http://syslinux.zytor.com/hardware.php
+The Linux boot protocol supports a "boot loader ID", a single byte
+where the upper nybble specifies a boot loader family (3 = SYSLINUX)
+and the lower nybble is version or, in the case of SYSLINUX, media:
+ 0x31 (49) = SYSLINUX
+ 0x32 (50) = PXELINUX
+ 0x33 (51) = ISOLINUX
+ 0x34 (52) = EXTLINUX
+In recent versions of Linux, this ID is available as
+ ++++ BUG REPORTS ++++
+I would appreciate hearing of any problems you have with SYSLINUX. I
+would also like to hear from you if you have successfully used SYSLINUX,
+*especially* if you are using it for a distribution.
+If you are reporting problems, please include all possible information
+about your system and your BIOS; the vast majority of all problems
+reported turn out to be BIOS or hardware bugs, and I need as much
+information as possible in order to diagnose the problems.
+There is a mailing list for discussion among SYSLINUX users and for
+announcements of new and test versions. To join, or to browse the
+archive, go to:
+ http://www.zytor.com/mailman/listinfo/syslinux
+Please DO NOT send HTML messages or attachments to the mailing list
+(including multipart/alternative or similar.) All such messages will
+be bounced.