1 Starting with 1.47, changes marked with SYSLINUX/PXELINUX/ISOLINUX
2 apply to that specific program only; other changes apply to both.
5 * ISOLINUX: Support booting disk image files (to boot DOS or
6 other non-Linux operating systems), *IF* the BIOS works
7 correctly; unfortunately many BIOSes apparently don't.
8 * Support Linux boot protocol version 2.03 (explicitly
9 specify the initrd address limit.)
10 * Handle small "pseudo-kernels"; images that use the Linux
11 kernel boot protocols but are less than 64K in size.
12 * MEMDISK: New subsystem; this is a driver which allows
13 legacy OSes to boot using an in-memory simulated disk.
14 See memdisk/memdisk.doc for more info.
15 * PXELINUX, ISOLINUX: Correctly handle files larger than 65535
16 blocks (32 MB for PXELINUX, 128 MB for ISOLINUX.)
17 * PXELINUX: Make a best-effort attempt at freeing all memory
18 claimed. From the looks of it, it will fail on most PXE
22 * Limited support for hardware flow control when using a
24 * Support specifying the serial port I/O address explicitly.
25 * Make DOS installer hopefully behave more nicely when used on
26 recent Windows versions.
27 * Fix returning to text mode when a font has been specified.
28 * Attempt to detect missing serial port hardware and disable
29 the serial port if there is nothing there.
32 * Make the ppmtolss16 program handle color conversion more
34 * Clean up "make install" target, honour INSTALLROOT if it
36 * SYSLINUX: Fix stack-smash bug identified by Steffen
38 * Hopefully fix return-to-text-mode on some graphics cards.
39 * ISOLINUX: Bug workaround for Award BIOS 4.51, and perhaps
40 other buggy BIOSes as well.
43 * PXELINUX: Allow the DHCP server to override the
44 configuration file name and pathname prefix, using
45 "site-specific" DHCP options.
46 * PXELINUX: Documentation fixes.
47 * PXELINUX: Fix the "ipappend" option; the last two values
48 were reversed vs. what the kernel expected.
49 * Introduce a way to return to text mode once we are already
50 in graphics mode. This may be useful for F-key help
52 * Fix several bugs in the way return to text mode was handled.
55 * ISOLINUX: Support full pathname searches. Max length for a
56 pathname is 255 characters. As a result, only 64 "label"
57 statements are supported in ISOLINUX.
58 * PXELINUX: Max filename length extended to 63 characters.
61 * Add support for graphical splash screens.
62 * Add mode control characters, which allows you to control
63 message display output depending on output mode (text,
64 graphics, or serial port.)
65 * ISOLINUX: New program, which boots Linux from a CD-ROM
66 without using floppy emulation mode. See isolinux.doc for
68 * PXELINUX: Don't search for boot sector file types, since
69 they don't work anyway.
70 * SYSLINUX: Document the LOCK command for Win9x, and the error
71 dialog box for WinNT/2K.
74 * PXELINUX: Fix code for finding !PXE from PXENV+. This was
75 due to a spec bug; match the most recent spec since that
76 seems to be what implementations actually do.
77 * SYSLINUX: Add some smarts to the boot sector, which
78 hopefully should reduce the number of systems which require
79 stupid mode ("syslinux -s").
80 * PXELINUX: Document further some of the pathologies with old
82 * When specifying a "default" command line, no longer
83 automatically appent "auto". See the "DEFAULT" command in
84 syslinux.doc for more information.
85 * PXELINUX: Clean up the allocation of local socket numbers.
88 * PXELINUX: Rename pxelinux.bin to pxelinux.0, to match what
89 most PXE servers seem to expect.
90 * PXELINUX: Update the DHCP/boot server setup documentation.
91 * PXELINUX: Support new "localboot" option for "label"
93 * PXELINUX: More robust parsing of DHCP/boot server packets.
94 * PXELINUX: Include a small utility program "gethostip" to
95 compute hexadecimal IP addresses.
98 * PXELINUX: Fix bugs introduced by new A20 code. (SYSLINUX
99 has also been changed for code consistency reasons, but I'm
100 pretty sure the changes are don't care on SYSLINUX.)
101 * Documentation updates.
102 * PXELINUX: Add "ipappend" option to generate an ip= option to
106 * PXELINUX: Not all PXE stacks fill in the IP address for a
107 type 3 cached info query. Use a type 2 cached info query
108 for this information (only.)
109 * Yet another attempt at A20 coding. Now support BIOS call
110 15:2401 as well, and handle machines which always have A20
112 * Support memory detection using INT 15h, AX=0E820h. BIOS
113 manufacturers have apparently gotten sloppy about keeping
114 INT 15h, AX=0E801h working properly.
115 * Don't issue <CR><LF> onto the serial port when we're doing
119 * Yet another A20-code update. It seems some "legacy-free"
120 machines and embedded gear simply don't have a KBC to talk
121 to, and that waiting for one will wait forever. Sigh.
124 * SYSLINUX: Implement a hack for BIOS drivers which hog significant
125 chunks of low memory during boot. (Note: PXELINUX already
126 had this modification. SYSLINUX does still require that the
127 low 512K is available; PXELINUX requires 384K. Machines
128 with a physical memory hole in the low 640K cannot boot
129 Linux no matter what.) Depending what the reason is for the
130 memory hole, a new kernel (2.4.0-test3-pre3 or later) may be
132 * SYSLINUX: Default installer binary now compiled against
133 glibc 2.1. If this is inappropriate for your system and you
134 still want to use the offical version of SYSLINUX, please
135 follow the instructions in "distrib.doc" to rebuild the
137 * SYSLINUX: Linux installer program now supports -o <offset>
138 option which does a loopback mount with the
139 -o loop,offset=<> option. Useful to run SYSLINUX on an
140 individual partition of a whole-harddisk image.
141 * Include the source code to a Master Boot Record (MBR)
142 functionally equivalent to the one installed DOS except it
143 includes EBIOS support, and should be resistant to geometry
144 changes. The MBR code is public domain.
145 * PXELINUX: Fix "double p" bug: if the tftp prefix was null,
146 all filenames would get a "p" preprended, e.g.
147 "ppxelinux.cfg" and "pvmlinux".
150 * PXELINUX: Workaround for PXE ROMs based on the Intel PXE PDK
151 3.0 build 071 and earlier: missing !PXE structure pointer.
152 * PXELINUX: Handle larger BOOTP/DHCP packages.
153 * PXELINUX: The command line passing was broken; fix.
154 * PXELINUX: Make COMBOOT images work.
155 * PXELINUX: Documentation on how to make booting work using
156 the PDK 3.0-derived clients, which aren't so generous as to
157 allow booting with only "PXEClient" specified.
160 * PXELINUX: RFC 1123 states that a TFTP implementation MUST
161 use adaptive timeout, "at least an exponential backoff of
162 retransmission timeout is necessary." Implement a very
163 simple exponential backoff for retransmits.
164 * PXELINUX: Updated documentation, including pointer to new
166 * PXELINUX: When sending ERROR due to bad OACK, use the proper
167 destination port number (why are TFTP port numbers so odd?)
168 * PXELINUX: If the boot dies in the middle somewhere,
169 eventually give up and reset the machine (unattended
173 * New program PXELINUX to do network booting using a
174 PXE-compliant (Pre-Execution Environment) network booting
175 PROM. See pxelinux.doc for details.
178 * Serial console support. See syslinux.doc for details.
181 * Change HIGHMEM_MAX to 38000000h to (hopefully) avoid the
182 kernel stepping on it; 3f000000h was apparently a higher
183 limit than the kernel used!
186 * Add sys2ansi.pl script to display the contents of a
187 colorized SYSLINUX file.
188 * Changed the io_delay once again, after a report that the
189 old delay port causes hangs on some systems.
192 * Frob the "fast A20 gate" port as well as the keyboard
193 controller; will this help systems with problems?
194 * Be even more paranoid about A20, unfortunately even this
195 seems to be not paranoid enough... what I don't understand
196 is that if there is hardware out there *this broken*, how
197 can it run Linux at all? Report an error message rather
198 than hang forever if A20 is stuck.
199 * Include some intermediate files in the distribution, plus
200 provide a "make installer" target for distributors to relink
201 the install programs only. I would prefer the syslinux boot
202 loader proper to be "binary clean" for debuggablity -- use
203 "make clean ; make installer" to rebuild the installers only.
206 * Don't get confused by directories, volume labels, or VFAT
208 * Use INT 15h, AX=0E801h to query memory size before trying
209 INT 15h, AH=88h. This not only provides more headroom
210 between the kernel and the initrd on large-memory machines,
211 but it appears some recent BIOSes actually have started
212 returning garbage for the AH=88h (older) call.
213 * Trust high memory beyond the 15 MB mark if the user has
214 specified it, or if obtained with INT 15h, AH=0E801h (with
215 no memory holes above 1 MB.)
218 * Increase A20M delay and put in a test to avoid problems on
219 certain IBM Thinkpads (thanks to Donnie Barnes of RedHat
220 for vital info on this one.)
221 * Support COMBOOT style boot command images.
222 * Support chain loading (foreign operating systems, e.g. DOS).
223 * Include a new "copybs" DOS utility to copy a boot sector to
224 a file (under Linux, use "dd".)
225 * Fix the DOS installer to work for disks over 32 MB.
226 * SYSLINUX should now handle disks with more than 65536 tracks.
229 * Fix a bug that caused "label" statements in syslinux.cfg to
230 not be handled properly.
231 * Updated the documentation. Among other things, we now allow
232 up to 128 "label" statements.
235 * Fix for booting old (pre-initrd) kernels.
236 * It seems at least some versions of OS/2 doesn't set up all
237 the fields in the superblock correctly. Account for that.
238 * Fix bug that caused boot failure when using the mem= option.
241 * Loading from partitions now should work properly. (Actually
242 tested, this time. You should even be able to dd a floppy
243 to a partition and boot from it.)
244 * Removed large workaround code for an alleged ancient BIOS
245 bug I have never actually seen. The -s option should work
246 on those machines, anyway.
247 * Support for simple keyboard remappings, same as used by
248 LILO (once again to support localization.) The program
249 keytab-lilo.pl from the LILO distribution included to
251 * Added a "safe, slow and stupid" (-s) option to the
252 installers. This option will lobotomize the boot sector to
253 hopefully work on even very buggy BIOSes.
256 * Ability to load a VGA font on bootup (for localized Linux
260 * Bug fix in the Linux installer.
261 * Added a workaround for a bug in certain AMI/Intel BIOSes
262 when booting from CD-ROM.
263 * Documentation changes.
266 * FAT16 filesystems are now supported.
269 * Now compiles under Linux, using NASM, rather than using
270 Turbo Assembler under DOS. See http://www.cryogen.com/Nasm
271 for information about NASM.
272 * Linux-hosted SYSLINUX installer, as well as a
273 rewritten DOS installer (now is written in assembler, so we
277 * Added support for loading bzImage and initrd loading, and made
278 SYSLINUX new-setup-code aware (SYSLINUX 1.30 id=0x31).
279 * Added LILO-style kernel labels; see the LABEL and IMPLICIT
280 keywords in README file.
281 * Added support for colorization of intro and help screens.
282 * The vga= option is now handled correctly.
283 * Massive rewrite of large chunks of the code in order to
284 support the first two new features.
287 * Added simple online help at the "boot:" prompt.
288 * Removed 2880K image as I no longer have access to such a
289 floppy drive. (Donations accepted!!)
290 * Decided to distribute the source in a subdirectory rather
291 than in a nested zipfile.
294 * Removed a sanity check which would cause booting to fail on
295 Phoenix BIOS version 4.03. Apparently this BIOS is buggy.
298 * Added configuration file SYSLINUX.CFG. This file contains all
299 configurable options, and can be edited from any OS which can
300 access an MS-DOS filesystem; there is no longer a need to run
301 SYSLINUX.EXE except to write the boot sector.
302 * Default command line now given by "default" line in config
304 * LINUXMSG.TXT and BOOTMSG.TXT hard-coded file names replaced by
305 "display" and "prompt" lines in config file.
306 * LILO-style option appending now supported ("append" line in
308 * Prompt timeout is now supported ("timeout" line in config
309 file). The timeout is cancelled when anything is typed on the
311 * Pressing <ESC> or <Ctrl-C> at the Loading... stage now aborts
312 the kernel loading in progress and returns the user to the
314 * The installer now automatically sets the READONLY flag on
316 * Added 2880K disk image.
319 * Fixed bug that would prevent booting from double-density
320 floppies and other DOS filesystems with multiple sectors per
322 * Added 720K disk image.
323 * Changed default kernel name on disk images to LINUX.
326 * Fixed bug that would garble the command line on recent kernels
327 with more than 4 sectors of setup code (this wasn't really a
328 *bug*; rather, a kernel change broke the code. Unfortunately
329 the Linux boot interface is still sorely undocumented).
330 * Added BOOTMSG.TXT file support (message file which does not
331 force display of the boot prompt).
334 * Fixed bug on some (most?) 386 BIOSes would require two boot