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linux内核

Starting with 1.47, changes marked with SYSLINUX/PXELINUX/ISOLINUX
apply to that specific program only; other changes apply to all of
them.

Changes in 3.20:
	* EXTLINUX: New options --install (-i) and --update (-U), to
	  make it clear if a boot loader should be installed or
	  updated.  For now, defaults to --install for compatibility;
	  a future version will require one of these options.
	* New library functions to load and place files in memory.

Changes in 3.11:
	* MEMDISK: Fix bug by which accessing the real floppy disk
	  as B: in MS-DOS was broken.
	* Simple menu system: allow tweaking of the screen layout.
	* Simple menu system: better command-line editing, correctly
	  handle command lines above 256 characters.
	* PXELINUX: revert memory allocation change that caused
	  problems on some network cards.
	* MEMDISK: Try work around a bug on some BIOSes when no
	  physical floppy disk is present in the system.
	* Enable the 16550A FIFOs, if present, when doing serial
	  console.
	* New "totaltimeout" command establishes a timeout without
	  regard for any user input.
	* Simple menu system: timeout behaviour now more in line with
	  user expectations.
	* Simple menu system: "ontimeout" should now work correctly.

Changes in 3.10:
	* gcc 4.0.1 compilation fixes.
	* Add support for querying the PCI BIOS in libcom32
	  (used by ethersel et al.)
	* Fix PCI handing (ethersel etc) on several old chipsets (and
	  VMWare.)
	* Try to deal with systems with broken EBIOS.
	* New API call to do "localboot".
	* New API call to query features.
	* New API call to run kernel image, a lower-level call than
	  "run command".  See comboot.doc.
	* Fix for bug in EBIOS code discovered by Arwin Vosselman.
	* NOESCAPE security fix.
	* Comments are now recognized even without a space following #.
	* Fix incorrect handling of mixes of entries with and without
	  MENU PASSWD.
	* The idle API call now harmlessly returns failure if it is a
	  no-op.  That way the caller can decide whether or not to
	  bother invoking it again.
	* Temporarily disable the idle API call on PXELINUX, due to
	  some platforms on which the idle API call seems to hang; this
	  problem has not yet been debugged.
	* MEMDISK: the handling of DOSEMU-headered images was broken;
	  fix it.
	* EXTLINUX: symlinks are now supported.
	* Simple menu system: N and P now work correctly as hotkeys.
	* MEMDISK: more BIOS bug workarounds.

Changes in 3.09:
	* gcc4 compilation fix.
	* <BEL> (Ctrl-G) in message files now causes a beep.
	* Reduce the command line to 511 characters; 1023 caused
	  memory overflows.

Changes in 3.08:
	* SYSLINUX: Fix performance regression (-s mode always
	  enabled.)
	* Add API function for idle loop.
	* libutil: Add do_idle() function for idle loop, make
	  get_key() use it.
	* libutil: Add SHA-1 and base64 functions.
	* Simple menu system: add password support.
	* EXTLINUX: Sparse files now handled correctly.
	* EXTLINUX: Large directories now handled correctly.
	* ALL: At the prompt, Ctrl-X now forces text mode.
	* Fix configuration file parsing error, that could cause
	  hangs.
	* Rewritten advanced menuing system from Murali Ganapathy.
	* MEMDISK: New "bigraw" mode to work around certain broken
	  BIOS flash programs.
	* COM32 module to boot Multiboot systems, including Xen.  See
	  com32/modules/mboot.doc.
	* Max command line changed to 1023 characters.  Note that the
	  kernel proper still can only handle 255 characters without
	  patching, and COM16 binaries can only handle 125 characters.

Changes in 3.07:
	* Fix chainloading (chain.c32).
	* Fix zlib build problem.
	* Use a private copy of <linux/ext2_fs.h>.

Changes in 3.06:
	* Fix typo that caused the ramdisk to load in the wrong place.

Changes in 3.05:
	* New API function "shuffle and boot"; allows COM32 modules to
	  load or construct (almost) arbitrarily complex objects,
	  e.g. a kernel and its initrd/initramfs in pieces, and have
	  the API core reorganize memory for booting.  (A library API
	  for this function will be introduced in a later version.)
	* The initrd= option now supports multiple filenames separated
	  by commas.  This is mostly useful for initramfs, which can
	  be composed of multiple separate cpio or cpio.gz archives.
	  (Note: all files except the last one are zero-padded to a 4K
	  page boundary.  This should not affect initramfs.)
	* EXTLINUX: Fix API function 000Ah (get derivative-specific
	  info).
	* libcom32/ethersel: Support PCI Config Mechanism #2 on
	  machines still infested with that hideous old hack.
	* SYSLINUX: Fix directory-parsing bug.

Changes in 3.02:
	* SYSLINUX: The "unix" installer now sets the MS-DOS
	  attributes (hidden, system, readonly.)
	* COM32 library: build the .lnx (test modules for running
	  under Linux) as architecture native modules, in case
	  i386 devel libraries aren't installed.
	* EXTLINUX: Hack for systems which don't have BLKGETSIZE64
	  defined in the standard header files.
	* Simple menu system: minor aestetic improvements, and try to
	  work better over a serial console (speed, and readability on
	  monochrome terminal emulators.)
	* New CONSOLE directive to control output on the video console
	  (useful for dealing with some broken serial-forwarding
	  BIOSes.)
	* New com32 module "ethersel" for searching for an Ethernet
	  card and selecting the proper version of Etherboot.
	* EXTLINUX: Allow the user to override the detected geometry.
	  Add help.

Changes in 3.01:
	* EXTLINUX, SYSLINUX: Fix compile errors on some systems.
	* EXTLINUX: Default to zipdrive geometry (64 heads, 32
	  sectors) if no other geometry can be detected.

Changes in 3.00:
	* SYSLINUX: Support FAT32 and EDD.  As an unfortunate
	  consequence, LDLINUX.SYS is no longer an ordinary file; it
	  is block-mapped at install time, which means it can only be
	  written using the syslinux installers.
	* SYSLINUX: Reorganize the source code for the installers;
          each one of the installers (dos, win32, unix, mtools) is now
          built in its own subdirectory.  In particular, "mtools" is
	  the unprivileged installer which uses mtools; "unix" is the
	  privileged installer which uses system calls.
	* SYSLINUX: Completely rewritten DOS installer in C.
	* ALL: "label" statement information is now stored in a
	  compressed format, which means that a lot more labels are
	  permitted (500-1000 in a typical configuration, but depends
	  on the complexity.)
	* EXTLINUX: New derivative, which boots from an ext2/ext3
	  filesystem.
	* SYSLINUX: The DOS and Win32 installers can now optionally
	  write the boot sector to a file instead of the real boot
	  sector.  This is not supported in the Linux installers,
	  however.
	* ALL: New NOESCAPE command, disables the "hold down the Shift
	  key to display the prompt" behaviour.
	* New simple menu system, as an alternative to the advanced
	  menu system already present.  See README.menu for details.
	* PXELINUX: Filenames can now be prefixed with an IP address
	  or DNS name plus :: (e.g. 192.0.2.1::filename or
	  server.domain.com::filename), which downloads a file from an
	  alternate TFTP server, or just a :: (e.g. ::filename), which
	  suppresses the common pathname prefix.  See pxelinux.doc.
	* SYSLINUX: Add an -m option to the DOS and Win32 installers
	  to write an MBR and -a to mark the partition SYSLINUX is
	  being installed on active.
	* MEMDISK: Give a way to query the boot loader type while
	  running MEMDISK; see memdisk/memdisk.doc and
	  sample/mdiskchk.c.
	* mkdiskimage: substantially improved mkdiskimage which, among
	  other things, can now be used to initialize USB keys as
	  zipdrives; see README.usbkey for more information.

Changes in 2.13:
	* MEMDISK: Fix command-line parsing "brown paper bag" class
	  bug.
	* MEMDISK: Add "raw" mode to support the DOS boot disk from
	  WinME/XP, which seems to deliberately crash the system
	  when someone uses the "INT 15h mover" highmem API.
	* Make "make install" do something sane for the com32
	  development environment.
	* In the spec file, create a separate -devel RPM for the com32
	  development environment.

Changes in 2.12:
	* Simple C library, based on klibc, for writing COM32
	  programs.
	* Fix the handling of file length in loading of COM32
	  programs.
	* MEMDISK: Work around a linker bug by rearranging the code to
	  not use the linker for the 16-bit code.
	* SYSLINUX: If we're building on a machine without a Win32
	  (mingw) compiler, just skip building syslinux.exe.
	* ISOLINUX: Support non-mkisofs mastering programs, at least
	  as long as the image is single-session.  For best results,
	  ISOLINUX should be the only boot loader installed.
	* MEMDISK: Allow the user to specify that the simulated disk
	  should be write-protected.

Changes in 2.11:
	* ALL: Add an API call to get the configuration file name.
	* SYSLINUX: Fix bug in 2.10 that prevented it from working
	  correctly for a lot of people.
	* SYSLINUX: In the installer, make mtools a bit less fussy.
	* Make the menu system compile with newer gcc's.

Changes in 2.10:
	* MEMDISK: Handle images compressed with zip as well as with
	  gzip.  Some Windows-based image tools apparently generate
	  these kinds of images by default.  Patch by Patrick
	  LoPresti.
	* Major menu improvement from Murali Ganapathy.
	* ISOLINUX: Wonderfully sick and brilliant workaround for
	  severe bugs in certain Award BIOSes; from Knut Petersen.
	* SYSLINUX: Fix for the nomtools installed, from Frederic
	  Pasteleurs.
	* PXELINUX: Fix handling of IP numbers in the ranges
	  100-109 and 200-209.
	* ALL: New option "allowoptions" (defaults to 1), which
	  controls if options are allowed on the command line or not.
	* SYSLINUX: Support building under klibc (see the klibc
	  distribution for details.)

Changes in 2.09:
	* SYSLINUX: Remove residual setuid crap from
	  syslinux-nomtools.
	* Handle video pages correctly when using the API functions.
	* Handle compiling on an x86-64 platform correctly.
	* Menu system from Murali Krishnan Ganapathy; see the menu
	  directory for information.
	* COMBOOT: Allow COMBOOT programs to change screen text mode.
	* COMBOOT: Correct the documentation of how to detect
	  SYSLINUX from COMBOOT!!!!
	* COMBOOT: Fix "get key without echo" API function.
	* SYSLINUX: Fix bug that affected the API open function.
	* ALL: Improve the E820 memory parser, to work around some
	  buggy BIOSes.

Changes in 2.08:
	* Add new configuration command "ontimeout" to allow timeout
	  to have a different action than just pressing Enter.
	* Add new configuration command "onerror" to allow a custom
	  command to be executed in case the kernel image is not found.
	* Fix bugs in the COMBOOT/COM32 command-line parsing.  APPEND
	  now works with COMBOOT/COM32 images.
	* PXELINUX: Poll for ARP requests while sitting at the
	  prompt.  This makes some boot servers a lot less unhappy.
	* PXELINUX: Actually free sockets when we get a failure
	  (including file not found.)  This bug would cause us to run
	  out of sockets and thus "go deaf" after a while.
	* MEMDISK: Add an API to query for the existence of MEMDISK.
	* SYSLINUX: Fix loading boot sectors (.bs/.bss) from floppy
	  disk.
	* .c32 is now one of the extensions searched for
	  automatically.
	* PXELINUX: RFBG.exe seems to randomly overwrite memory
	  location 0x5700.  Thus, don't use it!
	* PXELINUX: Change pathname length max from 63 to 127; change
	  max vkernels from 128 to 64.
	* Support Ctrl-U -> kill entire command line input.
	* The "samples" directory contains a (barely at all tested)
	  chain loading example, chain.c32, which may be used to
	  chainload local floppy disks and hard disks.  Use with
	  "chain fdN" or "chain hdN [partition]"; N = 0 for the first
	  drive of each type.

Changes in 2.07: