Changes:
Changes in 2.4 (May 3, 2009):

Brief summary :

- Added graphical Bochs debugger frontend for most of the supported platforms.
- Thanks for Chourdakis Michael and Bruce Ewing.
- Many new CPU features in emulation
- Support for > 32 bit physical address space and configurable MSRs
- VMX, 1G pages in long mode, MOVBE instruction
- Bugfixes for CPU emulation correctness, debugger and CPU instrumentation.
- New config interface ´win32config´ with start and runtime menu
- USB: added OHCI support, external hub and cdrom
- Added user plugin interface support.

Detailed change log :

- CPU and internal debugger
- Support for VMX hardware emulation in Bochs CPU, to enable configure with
--enable-vmx option
Nearly complete VMX implementation, with few exceptions:
- Dual-monitor treatment of SMIs and SMM not implemented yet
- NMI virtualization, APIC virtualization not implemented yet
- VMENTER to not-active state not supported yet
- No advanced features like Extended Page Tables or VPID
- Support for configurable MSR registers emulation, to enable configure with
--enable-configurable-msrs option
Look for configuration example in .bochsrc and msrs.def
- Support new Intel Atom(R) MOVBE instruction, to enable configure with
--enable-movbe option
- Support for 1G pages in long mode, to enable configure with
--enable-1g-pages option
- Support for > 32 bit physical address space in CPU. Up to 36 bit could be
seen in legacy mode (PAE) and up to 40 bit in x86-64 mode.
Still support the same amount of the physical memory in the memory object,
so system with > 4Gb of RAM yet cannot be emulated.
To enable configure with --enable-long-phy-address option.
- Implemented modern BIOSes mode limiting max reported CPUID function
to 3 using .bochsrc CPU option. The mode is required in order to
correctly install and boot WinNT.
- Added ability to configure CPUID vendor/brand strings through .bochsrc
(patch from @SF by Doug Reed).
- Many bugfixes for CPU emulation correctness (both x86 and x86-64).
- Updated CPU instrumentation callbacks.
- Fixed Bochs internal debugger breakpoints/watchpoints handling.

- Configure and compile
- Added ability to choose Bochs log file name and Bochs debugger log file
name from Bochs command line (using new -log and -dbglog options)
- Removed Peter Tattam´s closed source external debugger interface from
the code.
- Removed --enable-guest2host-tlb configure option. The option is always
enabled for any Bochs configuration.
- Removed --enable-icache configure option. The option is always enabled
for any Bochs configuration. Trace cache support still remains optional
and could be configured off.
- Added configure option to compile in GUI frontend for Bochs debugger,
to enable configure with --enable-debugger-gui option.
The GUI debugger frontend is enabled by default with Bochs debugger.
- Removed --enable-port-e9-hack configure option. The feature now could be
configured at runtime through .bochsrc.
- Added configure option to enable/disable A20 pin support. Disabling the
A20 pin support slightly speeds up the emulation.
- reduced dependencies between source files for faster code generation

- BIOS
- Added S3 (suspend to RAM) ACPI state to BIOS (patch by Gleb Natapov)
- Implemented MTRR support in the bios (patches by Avi Kivity and Alex
Williamsion with additions by Sebastian Herbszt)
- Bug fixes

- I/O Devices
- Added user plugin support
- remaining devices converted to plugins: pit, ioapic, iodebug
- added ´plugin_ctrl´ bochsrc option to control the presence of optional
device plugins without a separate option. By default all plugins are enabled.
- added register mechanism for removable mouse and keyboard devices
- Hard drive / cdrom
- PACKET-DMA feature now supported by all ATAPI commands
- ATAPI command 0x1A added (based on the Qemu implementation)
- sb16
- Added ALSA sound support on Linux (PCM/MIDI output)
- FM synthesizer now usable with MIDI output (simple piano only)
- Fixed OPL frequency to MIDI note translation
- Fixed MIDI output command
- keyboard
- added keyboard controller commands 0xCA and 0xCB
- USB
- USB code reorganized to support more HC types and devices
- added USB OHCI support written by Ben Lunt
- added external USB hub support (initial code ported from Qemu)
- added USB cdrom support (SCSI layer ported from Qemu)
- added status bar indicators to show data transfer
- VGA
- VBE video memory increased to 16 MB
- implemented changeable VBE LFB base address (PCI only, requires latest
BIOS and VGABIOS images)
- I/O APIC
- implemented I/O APIC device hardware reset

- Config interface
- new config interface ´win32config´ with start and runtime menu is now
the default on Windows (´textconfig´ is still available)
- win32 device config dialogs are now created dynamicly from a parameter list
(works like the wx ParamDialog)
- changes in textcofig and the wx ParamDialog for compatibility with the new
win32 dialog behaviour
- Bochs param tree index keys are case independent now
- some other additions / bugfixes in the simulator interface code

- Misc
- updated LGPL´d VGABIOS to version 0.6c
- Updated Bochs TESTFORM to version 0.4

- SF patches applied
[2784858] IO Handler names are not compared properly
[2712569] Legacy bios serial data buffer timeout bug by grybranix
[2655090] 64 bit BSWAP with REX.W broken by M. Eby
[2645919] CR8 bug when reading by M. Eby
[1895665] kvm: bios: add support to memory above the pci hole by Izik Eidus
[2403372] rombios: check for valid cdrom before using it by Sebastian
[2307269] acpi: handle S3 by Sebastian
[2354134] TAP networking on Solaris/Sparc repaired
[2144692] The scsi device can not complete its writing data command by naiyue
[1827082] [PATCH] Configurable CPU vendor by Marcel Sondaar
[2217229] Panic on EBDA overflow in rombios32 by Sebastian
[2210194] Log pci class code by Sebastian
[1984662] red led for disk write and titlebar mod by ggbsf
[2142955] Fix for monitor/mwait by Doug Gibson
[2137774] Patch to fix bug: cdrom: read_block: lseek returned error by Gabor Olah
[2134642] Fix scan_to_scanascii table for F11 and F12 by Ben Guthro & Steve Ofsthun
[2123036] sdl fullscreen fix by ggbsf
[2073039] Remove CMOS accsess from AML code by Gleb Natapov
[2072168] smbios: add L1-L3 cache handle to processor information by Sebastian
[2055416] bochsrc cpu options for cpuid vendor and brand string by Doug Reed
[2035278] rombios: Fix return from BEV via retf by Sebastian
[2035260] rombios: El Torito load segment fix by Sebastian
[2031978] Fix VMware backdoor command 0Ah by Jamie Lokier
[2015277] Remove obsolete comment about DATA_SEG_DEFS_HERE hack by Sebastian
[2011268] Set new default format and unit only if both are supported by Sebastian
[2001919] gdbstub: fix qSupported reply by Sebastian
[2001912] gdbstub: enclose packet data by apostrophes by Sebastian
[1998071] fix missing SIGHUP and SIGQUIT with term ui on mingw by Sebastian
[1998063] fix wrong colors with term ui by Sebastian
[1995064] Compile fix needed for --enable-debugger and gcc 4.3 by Hans de Goede
[1994564] Fix typo in RDMSR BX_MSR_MTRRFIX16K_A0000 by Sebastian
[1994396] Change hard_drive_post #if by Sebastian
[1993235] TESTFORM email address update by Sebastian
[1992322] PATCH: fix compilation of bochs 2.3.7 on bigendian machines by Hans de Goede
[1991280] Shutdown status code 0Ch handler by Sebastian
[1990108] Shutdown status code 0Bh handler by Sebastian
[1988907] Shutdown status code 0Ah handler by Sebastian
[1984467] two typos in a release! (2.3.7)
[1981505] Init PIIX4 PCI to ISA bridge and IDE by Sebastian

- these S.F. bugs were closed/fixed
[2784148] an integer overflow BUG of Bochs-2.3.7 source code
[2695273] MSVC cpu.dsp failure in 2.3.7.zip
[616114] Snapshot/Copy crash on Win2K
[2628318] ´VGABIOS-latest´ bug
[1945055] can´t ´make install´ lastest bochs on loepard
[2031993] Mac OS X Makefile bug
[1843199] install error on mac osx
[2710931] Problem compiling both instrumentation and debugger
[2617003] ExceptionInfo conflicts with OS X api
[2609432] stepping causes segfault (CVS)
[2605861] compile error with --enable-smp
[1757068] current cvs(Jul19, 07) failed to boot smp
[2426271] cannot get correct symbol entry
[2471982] VGA character height glitches
[1659659] wrong behaviour a20 at boot
[1998027] minwg + --with-term + --with-out-win32 = link failure
[1871936] bochs-2.3.6 make fails on wx.cc
[1684666] info idt for long mode
[2105989] could not read() hard drive image file at byte 269824
[1173093] Debugger totally not supports x86-64
[1803018] new win32debug dialog problems
[2141679] windows vcc build broken
[2162824] latest cvs fails to compile
[2164506] latest bochs fails to start
[2129223] MOV reg16, SS not working in real mode due to dead code
[2106514] RIS / startrom.com install ALMOST works
[2123358] SMP (HTT): wbinvd executed by CPU1 crashes CPU0
[2002758] Arch Linux: >>PANIC<< ATAPI command with zero byte count
[2026501] El Torito incorrect boot segment:offset
[2029758] BEV can return via retf instead of int 18h
[2010173] x command breaks after one error about x/s or x/i
[1830665] harddrv PANIC: ATAPI command with zero byte count
[1985387] fail to make using gcc4 with --enable-debugger
[1990187] testform feedback
[1992138] Misspell in cpu/ia_opcodes.h

- these S.F. feature requests were closed/implemented
[2175153] Update MSVC project files
[658800] front end program and bios
[1883370] Make cd and floppy images more usable
[422783] change floppy size without restarting
[2552685] param tree names should be case insensitive
[1214659] PC Speaker emu turnoff. Plugin Controll.
[1977045] support 40 bit physical address
[1506385] Intel Core Duo VT features
[1429015] Support for user plugins
[1488136] debugger access to floppy controller
[1363136] Full debugger SMP and 64 bit support
[2068304] Support for ACPI
[431032] debugger "x" command
[423420] profiling ideas (SMF)
[445342] Add FM support?
[928439] alsa