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*****************************************************************************
*** Directories structure ***
*****************************************************************************
./readme.txt - This file.
./license.txt - GPL3 license file.
./src/ - ChibiOS/RT portable kernel source files.
./src/include/ - ChibiOS/RT include files.
./src/lib/ - ChibiOS/RT library code that can be included into
user applications but is not part of the core system.
The code in this directory is meant to be portable,
generic and architecture indipendent.
./src/templates/ - ChibiOS/RT non portable source templates, new ports
are started by copying the templates into a new
directory under ./demos/ and/or ./ports/.
./ports/ - Architecture specific portable files.
./demos/ - Demo programs for specific archtectures/boards.
./ext/ - External libraries or other code not part of
ChibiOS/RT but used in the demo applications.
./test/ - Test code, used by some demos.
./docs/Doxifile - Doxigen project file.
./docs/html/index.html - ChibiOS/RT documentation (after running doxigen).
The documentation is also available on the project
web page: http://chibios.sourceforge.net/
*****************************************************************************
*** Current ports/demos ***
*****************************************************************************
Current ports under ./demos:
ARM7-LPC214x-GCC - ChibiOS/RT port for ARM7 LPC2148, the demo targets
the Olimex LPC-P2148 board. This port can be easily
modified for any processor into the LPC2000 family or
other boards. The demo can be compiled using YAGARTO
or any other GCC-based ARM toolchain. Full demo.
ARM7-LPC214x-GCC-min - Minimal demo for LPC214X.
ARM7-LPC214x-G++ - Yet another LPC214X demo but this one is done using
G++ in order to provide a C++ template project to the
ChibiOS/RT users.
ARM7-AT91SAM7X-GCC - Port for Atmel AT91SAM7X256. The demo program targets
the Olimex SAM7-EX256 board.
ARM7-AT91SAM7X-WEB-GCC - Port for Atmel AT91SAM7X256. The web demo program
targets the Olimex SAM7-EX256 board.
ARMCM3-ST32F103-GCC - ARM Cortex-M3 port. The demo targets the Olimex
STM32-P103 board.
AVR-AVRmega128-GCC - Port on AVRmega128. A special thanks to Vladimir for
the work done on the AVR port. The demo program
targets the Olimex AVR-MT-128 mini terminal board.
AVR-AT90CANx-GCC - Port on AVR AT90CAN128, not tested on hardware yet.
MSP430-MSP430x1611-GCC - Port on Texas Instruments MSP430F1611, the demo
targets the Olimex MSP430-P1611 board. It is not
tested on hardware yet, consider it work in progress.
Win32-MinGW - ChibiOS/RT simulator and demo into a WIN32 process,
MinGW version.
*****************************************************************************
*** Plans ***
*****************************************************************************
- We are looking into adding an exception clause to the ChibiOS/RT license in
order to allow linking with non-GLP code under certain conditions.
The license change will happen before the 1.0.0 release, we are almost
there, everything looks very stable now.
- Evaluate other architectures for a possible ChibiOS/RT port. An important
selection parameter will be the availability of FOSS toolchains. Currently
we are evaluating the MicroBlaze.
- Creation of a reduced ChibiOS/RT kernel targeted to lesser 8bit micros and
educational purposes, the name will probably be ChibiOS/SX, we are still
discussing it.
- File System implementation as side project. Basic requirements: Thread safe,
concurrent accesses, proper buffers cache.
*****************************************************************************
*** Releases ***
*****************************************************************************
*** 0.6.7 ***
- NEW: New chThdCreateFast() API, it is a simplified form of chThdCreate()
that allows even faster threads creation. The new API does not support
the "mode" and "arg" parameters (still available in the old API).
- OPT: Removed an unrequired initialization from the chThdCreate().
- OPT: Improvements to the test framework, now a virtual timer is used instead
of software loops into the bechmarks in order to have more stable results.
- Added the C++ wrapper entries to the documentation.
- Fixed the documentation entry for the chThdCreate() API.
*** 0.6.6 ***
- NEW: Improved test suite, now the suite is divided in modules and the code
is much easier to understand. The new framework simplifies the inclusion of
new test cases and makes possible to verify the exact sequence and the
timing of test events.
- NEW: New API chSysInTimeWindow() that checks if the current system time is
within the specified time window.
- FIX: Mutex test #1 in the test suite corrected, it failed to... fail.
- FIX: Fixed a problem in the STM32 port USART1 driver.
- FIX: Fixed a problem in the MMC/SD driver in the LPC2148 demo.
- Added the definitions for packed structures to the chtypes.h files.
- Improvements to the makefiles, now each source group has its own .mk include
file. Now it is no more required to rewrite everything in each makefile.
*** 0.6.5 ***
- NEW: Web server demo for the AT91SAM7X256, the demo integrates the uIP
stack and its demo applications.
- NEW: EMAC driver added to the AT91SAM7X port.
- FIX: Small fix to the ARM7 startup files. It used a short jump in the reset
vector and that could fail in some memory configurations.
- Documentation improvements.
*** 0.6.4 ***
- NEW: MSP430 port, the port code compiles correctly but it is not tested yet.
The port requires the MSPGCC toolchain.
- NEW: Added a CH_ARCHITECTURE_xxx define to the various chcore.h files, it
allows to write port-dependent code.
- NEW: Added to the documentation the technical notes about the currently
supported ports.
- FIX: In the ARM7 and ARMCM3 ports chanced the bool_t base type from int8_t
to int32_t, this produces a bit faster and smaller code.
It is nowhere required the bool_t type to be one byte sized.
- FIX: Small fixes to the template files, there were some leftovers of the old
type names.
- FIX: Modified the ARM demos makefiles in order to make them more compatible
with GCC 4.3.0, it seems the new GCC assumes -mthumb-interworking and
-mabi=apcs by default, at least the builds I tested did so, now the makefiles
explicitly assert -mno-thumb-interworking and -mabi=apcs-gnu in order to
produce better code.
- Added an Ethernet driver for AT91SAM7X EMAC, not complete yet, it will be
required by a uIP web server demo under ChibiOS/RT coming in some next
release.
*** 0.6.3 ***
- NEW: ARM Cortex-M3 port completed. The demo program targets the STM32F103
chip from ST Microelectronics on an Olimex STM32-P103 board.
- FIX: Fixed a minor error in ./ports/ARM7-LPC214x/vic.h, it should not affect
anything.
- FIX: Minor fix: in chThdCreate() a working area size equal to
UserStackSize(0) was asserted as an error when in debug mode. It is now
allowed.
- FIX: Increased the stack size for the threads in the test suite to 128 bytes
because THUMB/THUMB2 modes seem to use a lot more stack than ARM mode.
*** 0.6.2 ***
- NEW: Added C++ wrapper around the ChibiOS/RT core APIs, now it is possible
to use the OS in a fully object oriented application. The wrapper offers
classes that encapsulate threads, semaphores, mutexes, timers etc. Normal C
APIs are still accessible from C++ code as usual.
- NEW: Added a new LPC2148 demo using the new C++ wrapper, it is a good
example of C++ used for an embedded application. The demo does not use RTTI
nor standard libraries so the resulting code is very compact.
- Enhanced the chSemSignalWait() API to return the wakeup message just like
the other "Wait" semaphore functions do.
- Fixed a minor problem in the ARM7 port, the extctx structure definition was
missing one field, the effect was to allocate stacks 4 bytes shorter than
the declared size.
- Fixed a compile time error into the chThdSleepUntil() macro.
- Fixes in various headers to make some macros compatible with both C and C++.
- Fixed a regression in the LPC214x minimal demo that broke interrupt
handling.
- Some fixes to the doxigen documentation.
- More work done on the ARM-CM3 port but it is still not complete.
*** 0.6.1 ***
- Removed some redundant checks from the scheduler code: improved threads
flyback time, reduced interrupts service time.
- Nice scheduler speed improvement obtained by removing the 2nd parameter to
the chSchReadyI() API and manually assigning the message value only where
is really needed (very few points in the code).
- More space savings and speed improvements obtained by removing the
-fno-strict-aliasing option from the makefiles, now the kernel compiles
without any warning even without this option.
- Removed the -falign-functions=16 option from the AT91SAM7X demo makefiles,
the Atmel chip does not require it, the option is still present on the
LPC21xx demos. This saves significant program space.
- Started work on ARM Cortex-M3 architecture. The target chip is the STM32F103
on a Olimex STM32-P103 board.
- Added a threads state diagram to the documentation.
- Various fixes to the doxigen documentation.
*** 0.6.0 ***
- Code refactory, all the old sized-integer definitions like LONG32, UWORD16
etc are now replaced by the proper definitions provided by the compiler
into stdint.h.
- Code refactory, the previous system types style using a t_ in front of the
name has been replaced with the standard trailing _t. The system now uses
the size_t type defined into stddef.h. Some type names were modified in
order to not match commonly used type names.
- The above changes have an impact on some API prototypes but we can't help
it, the changes were required because the type names were a concern for
some users.
- Implemented a serial driver in the AVR port.
- Implemented a simple HD44780 LCD driver into the AVRmega128 demo.
- Reworked the AVR AT90CAN128 port to share the common AVR code.
- Modified the test suite to be compatible with 8 bit micros.
- MSVC demo dropped, it is still possible to use the MinGW demo as simulator
in Win32.
- Fixed a minor error in sam7x_serial.h and lpc214x_serial.h.
- The kernel is *unchanged* compared to version 0.5.3 except for the type
names but the change is important enough to make this a recommended update.
*** 0.5.5 ***
- Added an AVRmega128 port. The previous AT90CANx port is still present but
it will be redone after the AVRmega128 port is complete because it will
share most of it. The demo is very simple, it will be expanded in next
releases.
- Reorganized the code of the two ARM7 ports, now all the common ARM7 code
is in ./ports/ARM7. This will make maintenance and new ARM7 ports much much
easier.
- Simplified the directory structure under ./ports.
- Added to the readme a section with our future plans/ideas.
- The kernel is *unchanged* compared to version 0.5.3, just the new port and
the new demo were added.
*** 0.5.4 ***
- Port for Atmel AT91SAM7X256 introduced, the port should be useable also on
SAM7S and SAM7XC but no tests were performed. Other SAM7 processors should
also be useable with limited changes.
The demo currently just performs basic operations, will be enhanced in next
ChibiOS/RT releases, see the demo readme.txt file.
- Small fix to the thumb mode IRQ code on the LPC214x port, removed some extra
code.
- The kernel is *unchanged* compared to version 0.5.3, just the new port and
the new demo were added.
*** 0.5.3 ***
- Removed the chMsgSendTimeout() API, it was conceptually flawed because,
after sending a message, the sender *has* to wait for the answer or
the next sender in queue would receive it instead (the messages server has
no way to know that the sender is gone because a timeout).
A workaround would make the messages subsystem much heavier and this is
not acceptable.
- Removed the test case for chMsgSendTimeout() from the test suite.
- Space saved by reorganizing the timeout code into a single scheduler
function chSchGoSleepTimeoutS().
- Space optimizations in the semaphores code.
- The API chThdSleepUntil() become a macro saving some more code space.
- Because all the above changes the kernel code (ARM) is over 700 bytes
smaller.
*** 0.5.2 ***
- Fixed a small problem in the main header file ch.h.
- Small reordering in the fields of the Thread structure in order to optimize
the space when messages are not used.
*** 0.5.1 ***
- NEW: Priority enqueing for messages can be optionally enabled by specifying
the P_MSGBYPRIO option when creating a message server thread.
This change allows the implementation of a priority ceiling protocol into
message servers threads. Threads serving messages by priority and threads
serving messages in FIFO orded can exist at the same time in the system.
This feature can be enabled or disabled by toggling the option
CH_USE_MESSAGES_PRIORITY into the chconf.h file (disabled by default, old
behavior).
Note: This option brings a small overhead when sending a message regardless
if in FIFO or priority order, if you dont need priority ordering for your
messages it is better to keep the feature disabled in chconf.h.
- Added to the ARM demos load scripts the capability to load code in RAM
instead flash, the function must be marked as:
__attribute__((section(".ramtext")))
The option -mlong-calls should be specified in the makefile too or the
function declared with the "long-call" attribute.
- Fixed the MSVC demo project files.
- Fixed some syntax incompatibilites between GCC and MSVC into chmtx.c.
*** 0.5.0 ***
- NEW: Mutexes, the new mechanism provides a complete implementation of the
"priority inheritance" algorithm as a tool for work around the priority
inversion problem.
The Mutexes are not meant to replace the Semaphores that still are the best
synchronization mechanism between interrupt handlers and high level
code, something that Mutexes cannot do.
Soon an article will be added to the wiki describing pro and cons of the
various mechanisms and the correct use cases.
- RT Semaphores subsystem removed, the Mutexes implements a better solution
for the same problem.
- Fixed a bug in the round robin scheduling mode, see the bug tracker for
details and a fix for previous versions.
- More performance improvements to the scheduler. The ready list insertion
sequence is now reversed, it is scanned starting from the highest priority
end. This has an important side effect into the chSchWakeupS() that makes
most of the ready list insertions happen in constant time (extraction is
done always in constant time).
The worst case is always proportional to the number of threads in the ready
list but the normal case is much more often constant than linear. See the
new benchmarks added to the test suite.
- Added mutexes test cases and new benchmarks to the test suite.
- Modified the test suite in order to have each test case to have the same
alignment enforced on functions. This is done to reduce MAM/Cache alignment
effects on the measurement.
- IRQ entry/exit code is now encapsulated into two new macros, see chcore.h
for details.
- All the asm code previously in chcore2.s is now inline asm code in chcore.c
(ARM port), chcore2.s removed.
- Moved all the board specific definitions/code into two new files: board.c
and board.h. Moved all the files no more board-dependent under ports/
(ARM port).
- Improved the kernel performance in THUMB mode by better exploiting MAM
locality in some critical functions. The context switch benchmark shows
5% improved speed.
*** 0.4.5 ***
- Moved the serial IRQ handlers and VIC vectors initialization inside the
serial drivers. Now the serial-related code is all inside the driver.
- Moved all the other interrupt handlers from chcore2.s into chcore.c as
inline asm code. The interrupt code now is faster because one less call
level.
- Fixed a minor problem in chSysHalt() now it disables FIQ too and makes sure
to keep the processor in the state it had when it was halted.
Note: This is not a kernel bug but something specific with the ARM port, the
other ports are not affected.
- Fixed the macro chThdResumeI(), it had a regression.
*** 0.4.4 ***
- Fixed a very important bug in the preemption ARM code, important enough to
make this update *mandatory*.
Note: This is not a kernel bug but something specific with the ARM port, the
other ports are not affected.
- Fixed a nasty bug in the pure THUMB mode threads trampoline code (chcore2.s,
threadstart), it failed on THUMB threads returning with a "bx" instruction.
The bug did not affect ARM mode or THUMB with interworking mode.
Note: This is not a kernel bug but something specific with the ARM port, the
other ports are not affected.
- Fixed a bug in chIQGetTimeout(), interrupts were not re-enabled when exiting
the function because a timeout. The problem affected that API only.
- Fixed a potential problem in chSysInit(), it should not affect any past
application.
- Added a chDbgAssert() API to the debug subsystem.
- Cleaned up the kernel source code using chDbgAssert() instead of a lot of
"#ifdef CH_USE_DEBUG", it is much more readable now.
- Now the threads working area is filled with a 0x55 when in debug mode, this
will make easier to track stack usage using a JTAG probe.
- Added an I/O Queues benchmark to the test suite.
- Removed the chSchTimerHandlerI() routine from chschd.c and moved it into
chinit.c renaming it chSysTimerHandlerI() because it is not part of the
scheduler.
*** 0.4.3 ***
- Size optimization in the events code, now the chEvtWait() reuses the
chEvtWaitTimeout() code if it is enabled.
- Size optimization in the semaphores code, now the chSemWaitTimeout() just
invokes the chSemWaitTimeoutS() inside its system mutex zone. Same thing
done with chSemWait() and chSemWaitS().
- Size optimization in the queues code.
- Modified the return type of chSemWait() and chSemWaitS() from void to t_msg,
this allows to understand if the semaphore was signaled or reset without
have to access the Thread structure.
- Added a threads create/exit/wait benchmark to the test suite, the system
is capable of 81712 threads started/terminated per second on the reference
LPC2148 board. The figure is inclusive of two context switch operations
for each thread.
- Minor improvement in the LPC214x serial driver, unneeded events were
generated in some rare cases.
- Fixed a chSysInit() documentation error.
- Fixed a chEvtWaitTimeout() documentation error.
- Added a new debug switch: CH_USE_TRACE, previously the trace functionality
was associated to the CH_USE_DEBUG switch.
*** 0.4.2 ***
- Added a minimal ARM7-LPC demo, you can use this one as template in order to
create your application. It is easier to add subsystems back to the small
demo than remove stuff from the large one.
- Introduced support for "pure" THUMB mode, it is activated when all the
source files are compiled in THUMB mode, the option -mthumb-interworking is
not used in this scenario and this greatly improves both code size and
speed.
It is recommended to either use ARM mode or THUMB mode and not mix them
unless you know exactly what you are doing. Mixing modes is still supported
anyway.
- More optimizations in the scheduler, updated the performance spreadsheet.
- Fixed a problem with the thread working area declarations, the alignment to
4 bytes boundary was not enforced. Now it is defined a new macro
WorkingArea(name, length) that takes care of both the allocation and the
alignment.
Example:
static WorkingArea(waThread1, 32);
It is expanded as:
ULONG32 waThread1[UserStackSpace(32) >> 2];
Now the demos use the new declaration style.
- Fixed a small problem in sleep functions introduced in 0.4.1.
*** 0.4.1 ***
- Modified the initialization code in order to have a dedicated idle thread in
the system, now the main() function behaves like a normal thread after
executing chSysInit() and can use all the ChibiOS/RT APIs (it was required
to run the idle loop in previous versions).
Now it is also possible to use ChibiOS/RT with a single main() thread and
just use it for the I/O capabilities, Virtual Timers and events. Now you
don't have to use multiple threads if you don't really need to.
- Added a spreadsheet in the documentation that describes the advantages
and disadvantages of the various optimization options (both GCC options and
ChibiOS/RT options), very interesting read IMO.
- The GCC option +falign-functions=16 is now default in the Makefile, it is
required because of the MAM unit into the LPC chips, without this option
the code performance is less predictable and can change of some % points
depending on how the code is aligned in the flash memory, unpredictability
is bad for a RTOS. This option however increases the code size slightly
because of the alignment gaps.
- Fine tuning in the scheduler code for improved performance, deeper
inlining and other small changes, about 5% better scheduler performance.
- Increased the default system-mode stack size from 128 to 256 bytes because
some optimizations and the THUMB mode seem to eat more stack space.
- Included a Makefile in the LPC2148 demo that builds in THUMB mode.
- Const-ified a parameter in the chEvtWait() and chEvtWaitTimeout() APIs.
- Removed the CPU register clearing on thread start, it was not really useful,
it is better to maximize performance instead.
- Cleaned up the ARM port code. Now it is easier to understand.
- Cleaned up the LPC2148 demo in main.c, it is now well documented and
explains everything, I assumed too much stuff to be "obvious".
*** 0.4.0 ***
- NEW, added a benchmark functionality to the test suite. The benchmark
measures the kernel throughput as messages per second and context switches
per second. The benchmark will be useful for fine tuning the compiler
options and the kernel itself.
- NEW, implemented a debug subsystem, it supports debug messages and a context
switch circular trace buffer. The debug code can be enabled/disabled by
using the CH_USE_DEBUG in chconf.h.
The trace buffer is meant to be fetched and decoded by an external tool
(coming soon, it can be accessed using JTAG in the meanwhile).
- Added new API chThdGetPriority() as a macro.
- Implemented panic messages when CH_USE_DEBUG is enabled.
- Added a thread identifier field to the Thread structure, it is used only
for debug.
- Global variable stime modified as volatile.
- API chSysGetTime() reimplemented as a macro.
- Fixed a regression with the CH_CURRP_REGISTER_CACHE option.
- Fixed a problem in the LPC2148 interrupt handling code, a spurious
interrupts fix recommended on the NXP data sheet proved to be a very bad
idea and not about real spurious interrupts also...
- Fixed an harmless warning message in buzzer.c.
*** 0.3.6 ***
- Added SSP (SPI1) and ext.interrupts definitions to the lpc214x.h file.
- Added SSP driver for the LPC2148.
- Added experimental MMC/SD block driver to the LPC2148 demo in order to
support file systems. The driver features also events generation on card
insert/remove, hot plugging supported.
- Added missing chThdSuspend() declararion in threads.h.
*** 0.3.5 ***
- Space optimization in events code.
- Changed the behavior of chEvtWaitTimeout() when the timeout parameter is
set to zero, now it is consistent with all the other syscalls that have a
timeout option.
- Reorganized all the kernel inline definitions into a single file (inline.h).
- Fixed a minor problem in the interrupt initialization code for the LPC214x
demo, regrouped the VIC-specific code into vic.c/vic.h.
- Fixed a bug into the LPC2148 serial driver (limited to the serial port 2).
- Implemented HW transmit FIFO preloading in the LPC2148 serial driver in
order to minimize the number of interrupts generated, it is possible to
disable the feature and return to the old code which is a bit smaller, see
the configuration parameters in ./ARM7-LPC214x/GCC/lpc214x_serial.h.
- Some more work done on the AVR port, it is almost complete but not tested
yet because my JTAG probe broke...
*** 0.3.4 ***
- Fixed a problem in chVTSetI().
- New API, chVTIsArmedI(), it is a macro in delta.h.
- New API, chThdResumeI(), it is a macro in threads.h. This function is just
an alias for chSchReadyI() but makes the code more readable.
- New API, chThdSuspend(). New switch CH_USE_SUSPEND added to chconf.h.
*** 0.3.3 ***
- Modified the chVTSetI(), now for the "time" parameter can have value zero
with meaning "infinite". This allows all the APIs with timeout parameters
to be invoked with no timeout.
- Fixes in the documentation.
- Renamed some APIs in the "Sch" group to have an S suffix instead of I.
*** 0.3.2 ***
- Modified the chSysInit() to give the idle thread absolute priority, the
priority is then lowered to the minimum value into the chSysPause(). This
is done in order to ensure that the initializations performed into the
main() procedure are finished before any thread starts.
- Added chThdSetPriority() new API.
- Added a generic events generator timer modulee to the library code.
- Modified the ARM7-LPC214x-GCC demo to show the use of the event timer.
- Added the "#ifdef __cplusplus" stuff to the header files.
- Removed an obsolete definition in ./src/templates/chtypes.h.
*** 0.3.1 ***
- Test program added to the demos. Telnet the MinGW and MSVS demos and type
"test" at the "ch>" prompt. On the LPC214x demo the test is activated by
pressing both the board buttons. The test performs tests on the ChibiOS/RT
functionalities.
The test code is also a good example of APIs usage and ChibiOS/RT behavior.
- Fixed bug in chEvtWaitTimeout(), the timeout code performed an useless
dequeue operation.
- Fixed a bug in chSemWaitTimeoutS() and chSemWaitTimeout(), the semaphore
counter was not atomically updated on a timeout condition.
- Fixed bug on RT semaphores, the priority queuing was broken.
- Fixed a bug in the MinGW demo, the chThdExit() code was not correctly
reported to the thread waiting in chThdWait().
- Fixed a function declaration in semaphores.h.
- Lists code moved into chlists.c from various other places optimized and
reorganized.
- The list of the threads waiting in chThdWait() is now a single link list,
this saves some space.
- Cleaned the template files code, the files contained some obsolete
declarations.
- Code optimization in chSemWaitTimeoutS(), chSemWaitTimeout() and
chSemSignalWait().
- Code optimization in chEvtSend().
- Code optimization in chVTDoTickI().
- Added a Semaphore pointer to the Thread structure, this allows to know on
which semaphore a thread is waiting on. It takes no space because it is
located in the union inside the Thread structure. This also allowed a minor
optimization inside chSemWaitTimeout() and chSemWaitTimeoutS().
- Changed the priority type to unsigned in order to make it compatible
with a byte value, this is very important for 8 bits architectures.
- Modified the MinGW and MSVS demos to use 1ms ticks instead of 10ms as
before.
*** 0.3.0 ***
- ChibiOS/RT goes beta.
- Diet for the threads code, some simple APIs become macros.
- Thread Local Storage implemented as a single API: chThdLS().
The API simply returns a pointer into the thread working area, see the
documentation on the web site.
- Moved some documentation and images from the web site into the Doxigen
generated HTMLs.
*** 0.2.1 ***
- Optimizations in the RT semaphores subsystem. The support for this
subsystem should still be considered experimental and further changes may
happen in future versions.
- Bug fix in the virtual timers handling code, now the timers can be re-armed
from within the callback code in order to create periodic virtual timers.
- Modified the t_prio type in the demos to be 32bits wide instead of 16bits,
this results in a better code in critical sections of the kernel.
*** 0.2.0 ***
- Introduced support for ARM in thumb mode.
- Optimized context switching when thumb-interworking is not required, one
less instruction.
- Minor fixes to the ARM demo.
*** 0.1.1 ***
- Some fixes into the documentation
- Renamed the makefiles to Makefile, upper case M.
*** 0.1.0 ***
- First alpha release
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