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Keil 4 to Kiel 5 upgrade

I am rebuilding my computer after experiencing a corrupt boot sector and am reinstalling all my apps.  I am moving from Kiel 4 to Kiel 5.  My project loads, but it says that it needs the ARM Tool chain which is not installed. I installed the Toolchain on WIN 10 and it seemed to install smoothly, however in the Project menu, the Options menu item and those below it are all disabled.  Can you guide me through this? 

I notice in the readme.txt in * Architecture options usage * there is a considerable amount ot config options, is this a necessary requirement for the nRF51422 ?  

Thanks,

Brian Fleming

Parents
  • Hi,

    Please contact Keil support for tool's problem

    http://www.keil.com/support/

     

    I cannot find the readm.txt with that statement.

    Where do you get the readme.txt? Where do you get? 

     

    -Amanda H.

  • Hello here is the readme which popped up after the install.

    GNU Tools for Arm Embedded Processors
    Version: 8
    
    Table of Contents
    * Installing executables on Linux
    * Installing executables on Mac OS X
    * Installing executables on Windows
    * Invoking GCC
    * Architecture options usage
    * C Libraries usage
    * Linker scripts & startup code
    * Samples
    * GDB Server for CMSIS-DAP based hardware debugger
    
    * Installing executables on Linux *
    Unpack the tarball to the install directory, like this:
    $ cd $install_dir && tar xjf gcc-arm-none-eabi-*-yyyymmdd-linux.tar.bz2
    
    If you want to use gdb python build (arm-none-eabi-gdb-py), you'd
    install python2.7.
    
    For some Ubuntu releases, the toolchain can also be installed via
    Launchpad PPA at https://launchpad.net/~team-gcc-arm-embedded/+archive/ubuntu/ppa.
    
    * Installing executables on Mac OS X *
    Unpack the tarball to the install directory, like this:
    $ cd $install_dir && tar xjf gcc-arm-none-eabi-*-yyyymmdd-mac.tar.bz2
    
    * Installing executables on Windows *
    Run the installer (gcc-arm-none-eabi-*-yyyymmdd-win32.exe) and follow the
    instructions. The installer can also be run on the command line. When run on
    the command-line, the following options can be set:
      - /S Run in silent mode
      - /P Adds the installation bin directory to the system PATH
      - /R Adds an InstallFolder registry entry for the install.
    
    For example, to install the tools silently, amend users PATH and add registry
    entry:
    > gcc-arm-none-eabi-*-yyyymmdd-win32.exe /S /P /R
    
    The toolchain in windows zip package is a backup to windows installer for
    those who cannot run installer.  We need decompress the zip package
    in a proper place and then invoke it following instructions in next section.
    
    To use gdb python build (arm-none-eabi-gdb-py), you need install 32 bit
    python2.7 no matter 32 or 64 bit Windows. Please get the package from
    https://www.python.org/download/.
    
    * Invoking GCC *
    On Linux and Mac OS X, either invoke with the complete path like this:
    $ $install_dir/gcc-arm-none-eabi-*/bin/arm-none-eabi-gcc
    
    Or set path like this:
    $ export PATH=$PATH:$install_dir/gcc-arm-none-eabi-*/bin
    $ arm-none-eabi-gcc
    
    On Windows (although the above approaches also work), it can be more
    convenient to either have the installer register environment variables, or run
    INSTALL_DIR\bin\gccvar.bat to set environment variables for the current cmd.
    
    For windows zip package, after decompression we can invoke toolchain either with
    complete path like this:
    TOOLCHAIN_UNZIP_DIR\bin\arm-none-eabi-gcc
    or run TOOLCHAIN_UNZIP_DIR\bin\gccvar.bat to set environment variables for the
    current cmd.
    
    * Architecture options usage *
    
    This toolchain is built and optimized for Cortex-A/R/M bare metal development.
    the following table shows how to invoke GCC/G++ with correct command line
    options for variants of Cortex-A/R and Cortex-M architectures.
    
    --------------------------------------------------------------------------
    | Arm core   | Command Line Options                       | multilib     |
    |------------|--------------------------------------------|--------------|
    | Cortex-M0+ | -mthumb -mcpu=cortex-m0plus                | thumb        |
    | Cortex-M0  | -mthumb -mcpu=cortex-m0                    | /v6-m        |
    | Cortex-M1  | -mthumb -mcpu=cortex-m1                    |              |
    |            |--------------------------------------------|              |
    |            | -mthumb -march=armv6-m                     |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M3  | -mthumb -mcpu=cortex-m3                    | thumb        |
    |            |--------------------------------------------| /v7-m        |
    |            | -mthumb -march=armv7-m                     |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M4  | -mthumb -mcpu=cortex-m4                    | thumb        |
    | (No FP)    |--------------------------------------------| /v7e-m       |
    |            | -mthumb -march=armv7e-m                    |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M4  | -mthumb -mcpu=cortex-m4 -mfloat-abi=softfp | thumb        |
    | (Soft FP)  | -mfpu=fpv4-sp-d16                          | /v7e-m       |
    |            |--------------------------------------------| /fpv4-sp     |
    |            | -mthumb -march=armv7e-m -mfloat-abi=softfp | /softfp      |
    |            | -mfpu=fpv4-sp-d16                          |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M4  | -mthumb -mcpu=cortex-m4 -mfloat-abi=hard   | thumb        |
    | (Hard FP)  | -mfpu=fpv4-sp-d16                          | /v7e-m       |
    |            |--------------------------------------------| /fpv4-sp     |
    |            | -mthumb -march=armv7e-m -mfloat-abi=hard   | /hard        |
    |            | -mfpu=fpv4-sp-d16                          |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M7  | -mthumb -mcpu=cortex-m7                    | thumb        |
    | (No FP)    |--------------------------------------------| /v7e-m       |
    |            | -mthumb -march=armv7e-m                    |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M7  | -mthumb -mcpu=cortex-m7 -mfloat-abi=softfp | thumb        |
    | (Soft FP)  | -mfpu=fpv5-sp-d16                          | /v7e-m       |
    |            |--------------------------------------------| /fpv4-sp     |
    |            | -mthumb -march=armv7e-m -mfloat-abi=softfp | /softfp      |
    |            | -mfpu=fpv5-sp-d16                          |              |
    |            |--------------------------------------------|--------------|
    |            | -mthumb -mcpu=cortex-m7 -mfloat-abi=softfp | thumb        |
    |            | -mfpu=fpv5-d16                             | /v7e-m       |
    |            |--------------------------------------------| /fpv5        |
    |            | -mthumb -march=armv7e-m -mfloat-abi=softfp | /softfp      |
    |            | -mfpu=fpv5-d16                             |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M7  | -mthumb -mcpu=cortex-m7 -mfloat-abi=hard   | thumb        |
    | (Hard FP)  | -mfpu=fpv5-sp-d16                          | /v7e-m       |
    |            |--------------------------------------------| /fpv4-sp     |
    |            | -mthumb -march=armv7e-m -mfloat-abi=hard   | /hard        |
    |            | -mfpu=fpv5-sp-d16                          |              |
    |            |--------------------------------------------|--------------|
    |            | -mthumb -mcpu=cortex-m7 -mfloat-abi=hard   | thumb        |
    |            | -mfpu=fpv5-d16                             | /v7e-m       |
    |            |--------------------------------------------| /fpv5        |
    |            | -mthumb -march=armv7e-m -mfloat-abi=hard   | /hard        |
    |            | -mfpu=fpv5-d16                             |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M23 | -mthumb -mcpu=cortex-m23                   | thumb        |
    |            |--------------------------------------------| /v8-m.base   |
    |            | -mthumb -march=armv8-m.base                |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M33 | -mthumb -mcpu=cortex-m33                   | thumb        |
    |  (No FP)   |--------------------------------------------| /v8-m.main   |
    |            | -mthumb -march=armv8-m.main                |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M33 | -mthumb -mcpu-cortex-m33                   | thumb        |
    | (Soft FP)  | -mfloat-abi=softfp -mfpu=fpv5-sp-d16       | /v8-m.main   |
    |            |--------------------------------------------| /fpv5-sp     |
    |            | -mthumb -march=armv8-m.main                | /softfp      |
    |            | -mfloat-abi=softfp -mfpu=fpv5-sp-d16       |              |
    |            |--------------------------------------------|--------------|
    |            | -mthumb -march=armv8-m.main                | thumb        |
    |            | -mfloat-abi=softfp -mfpu=fpv5-d16          | /v8-m.main   |
    |            |                                            | /fpv5        |
    |            |                                            | /softfp      |
    |------------|--------------------------------------------|--------------|
    | Cortex-M33 | -mthumb -mcpu=cortex-m33                   | thumb        |
    | (Hard FP)  | -mfloat-abi=hard -mfpu=fpv5-sp-d16         | /v8-m.main   |
    |            |--------------------------------------------| /fpv5-sp     |
    |            | -mthumb -march=armv8-m.main                | /hard        |
    |            | -mfloat-abi=hard -mfpu=fpv5-sp-d16         |              |
    |            |--------------------------------------------|--------------|
    |            | -mthumb -march=armv8-m.main                | thumb        |
    |            | -mfloat-abi=hard -mfpu=fpv5-d16            | /v8-m.main   |
    |            |                                            | /fpv5        |
    |            |                                            | /hard        |
    |------------|--------------------------------------------|--------------|
    | Cortex-R4  | [-mthumb] -march=armv7-r                   | thumb        |
    | Cortex-R5  |                                            | /v7-ar       |
    | Cortex-R7  |                                            |              |
    | Cortex-R8  |                                            |              |
    | (No FP)    |                                            |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-R4  | [-mthumb] -march=armv7-r -mfloat-abi=softfp| thumb        |
    | Cortex-R5  | -mfpu=vfpv3-d16                            | /v7-ar       |
    | Cortex-R7  |                                            | /fpv3        |
    | Cortex-R8  |                                            | /softfp      |
    | (Soft FP)  |                                            |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-R4  | [-mthumb] -march=armv7-r -mfloat-abi=hard  | thumb        |
    | Cortex-R5  | -mfpu=vfpv3-d16                            | /v7-ar       |
    | Cortex-R7  |                                            | /fpv3        |
    | Cortex-R8  |                                            | /hard        |
    | (Hard FP)  |                                            |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-R52 | [-mthumb] -mcpu=cortex-r52                 | thumb        |
    | (No FP)    |--------------------------------------------| /v7-ar       |
    |            | [-mthumb] -march=armv8-r+crc               |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-R52 | [-mthumb] -mcpu=cortex-r52                 | thumb        |
    | (Soft FP)  | -mfloat-abi=softfp -mfpu=neon-fp-armv8     | /v7-ar       |
    |            |--------------------------------------------| /fpv3        |
    |            | [-mthumb] -march=armv8-r+crc               | /softfp      |
    |            | -mfloat-abi=hard -mfpu=neon-fp-armv8       |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-R52 | [-mthumb] -mcpu=cortex-r52                 | thumb        |
    | (Hard FP)  | -mfloat-abi=hard -mfpu=neon-fp-armv8       | /v7-ar       |
    |            |--------------------------------------------| /fpv3        |
    |            | [-mthumb] -march=armv8-r+crc               | /hard        |
    |            | -mfloat-abi=hard -mfpu=neon-fp-armv8       |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-A*  | [-mthumb] -march=armv7-a                   | thumb        |
    | (No FP)    |                                            | /v7-ar       |
    |------------|--------------------------------------------|--------------|
    | Cortex-A*  | [-mthumb] -march=armv7-a -mfloat-abi=softfp| thumb        |
    | (Soft FP)  | -mfpu=vfpv3-d16                            | /v7-ar       |
    |            |                                            | /fpv3        |
    |            |                                            | /softfp      |
    |------------|--------------------------------------------|--------------|
    | Cortex-A*  | [-mthumb] -march=armv7-a -mfloat-abi=hard  | thumb        |
    | (Hard FP)  | -mfpu=vfpv3-d16                            | /v7-ar       |
    |            |                                            | /fpv3        |
    |            |                                            | /hard        |
    --------------------------------------------------------------------------
    
    * C Libraries usage *
    
    This toolchain is released with two prebuilt C libraries based on newlib:
    one is the standard newlib and the other is newlib-nano for code size.
    To distinguish them, we rename the size optimized libraries as:
    
      libc.a --> libc_nano.a
      libg.a --> libg_nano.a
    
    To use newlib-nano, users should provide additional gcc compile and link time
    option:
     --specs=nano.specs
    
    At compile time, a 'newlib.h' header file especially configured for newlib-nano
    will be used if --specs=nano.specs is passed to the compiler.
    
    Nano.specs also handles two additional gcc libraries: libstdc++_nano.a and
    libsupc++_nano.a, which are optimized for code size.
    
    For example:
    $ arm-none-eabi-gcc src.c --specs=nano.specs $(OTHER_OPTIONS)
    
    This option can also work together with other specs options like
    --specs=rdimon.specs
    
    Please note that --specs=nano.specs is a both a compiler and linker option.  Be
    sure to include in both compiler and linker options if compiling and linking
    are separated.
    
    ** additional newlib-nano libraries usage
    
    Newlib-nano is different from newlib in addition to the libraries' name.
    Formatted input/output of floating-point number are implemented as weak symbol.
    If you want to use %f, you have to pull in the symbol by explicitly specifying
    "-u" command option.
    
      -u _scanf_float
      -u _printf_float
    
    e.g. to output a float, the command line is like:
    $ arm-none-eabi-gcc --specs=nano.specs -u _printf_float $(OTHER_LINK_OPTIONS)
    
    For more about the difference and usage, please refer the README.nano in the
    source package.
    
    Users can choose to use or not use semihosting by following instructions.
    ** semihosting
    If you need semihosting, linking like:
    $ arm-none-eabi-gcc --specs=rdimon.specs $(OTHER_LINK_OPTIONS)
    
    ** non-semihosting/retarget
    If you are using retarget, linking like:
    $ arm-none-eabi-gcc --specs=nosys.specs $(OTHER_LINK_OPTIONS)
    
    * Linker scripts & startup code *
    
    Latest update of linker scripts template and startup code is available on
    https://developer.arm.com/embedded/cmsis
    
    * Samples *
    Examples of all above usages are available at:
    $install_dir/gcc-arm-none-eabi-*/share/gcc-arm-none-eabi/samples
    
    Read readme.txt under it for further information.
    
    * GDB Server for CMSIS-DAP based hardware debugger *
    CMSIS-DAP is the interface firmware for a Debug Unit that connects
    the Debug Port to USB.  More detailed information can be found at
    http://www.keil.com/support/man/docs/dapdebug/.
    
    A software GDB server is required for GDB to communicate with CMSIS-DAP based
    hardware debugger.  The pyOCD is an implementation of such GDB server that is
    written in Python and under Apache License.
    
    For those who are using this toolchain and have board with CMSIS-DAP based
    debugger, the pyOCD is our recommended gdb server.  More information can be
    found at https://github.com/mbedmicro/pyOCD.
    

Reply
  • Hello here is the readme which popped up after the install.

    GNU Tools for Arm Embedded Processors
    Version: 8
    
    Table of Contents
    * Installing executables on Linux
    * Installing executables on Mac OS X
    * Installing executables on Windows
    * Invoking GCC
    * Architecture options usage
    * C Libraries usage
    * Linker scripts & startup code
    * Samples
    * GDB Server for CMSIS-DAP based hardware debugger
    
    * Installing executables on Linux *
    Unpack the tarball to the install directory, like this:
    $ cd $install_dir && tar xjf gcc-arm-none-eabi-*-yyyymmdd-linux.tar.bz2
    
    If you want to use gdb python build (arm-none-eabi-gdb-py), you'd
    install python2.7.
    
    For some Ubuntu releases, the toolchain can also be installed via
    Launchpad PPA at https://launchpad.net/~team-gcc-arm-embedded/+archive/ubuntu/ppa.
    
    * Installing executables on Mac OS X *
    Unpack the tarball to the install directory, like this:
    $ cd $install_dir && tar xjf gcc-arm-none-eabi-*-yyyymmdd-mac.tar.bz2
    
    * Installing executables on Windows *
    Run the installer (gcc-arm-none-eabi-*-yyyymmdd-win32.exe) and follow the
    instructions. The installer can also be run on the command line. When run on
    the command-line, the following options can be set:
      - /S Run in silent mode
      - /P Adds the installation bin directory to the system PATH
      - /R Adds an InstallFolder registry entry for the install.
    
    For example, to install the tools silently, amend users PATH and add registry
    entry:
    > gcc-arm-none-eabi-*-yyyymmdd-win32.exe /S /P /R
    
    The toolchain in windows zip package is a backup to windows installer for
    those who cannot run installer.  We need decompress the zip package
    in a proper place and then invoke it following instructions in next section.
    
    To use gdb python build (arm-none-eabi-gdb-py), you need install 32 bit
    python2.7 no matter 32 or 64 bit Windows. Please get the package from
    https://www.python.org/download/.
    
    * Invoking GCC *
    On Linux and Mac OS X, either invoke with the complete path like this:
    $ $install_dir/gcc-arm-none-eabi-*/bin/arm-none-eabi-gcc
    
    Or set path like this:
    $ export PATH=$PATH:$install_dir/gcc-arm-none-eabi-*/bin
    $ arm-none-eabi-gcc
    
    On Windows (although the above approaches also work), it can be more
    convenient to either have the installer register environment variables, or run
    INSTALL_DIR\bin\gccvar.bat to set environment variables for the current cmd.
    
    For windows zip package, after decompression we can invoke toolchain either with
    complete path like this:
    TOOLCHAIN_UNZIP_DIR\bin\arm-none-eabi-gcc
    or run TOOLCHAIN_UNZIP_DIR\bin\gccvar.bat to set environment variables for the
    current cmd.
    
    * Architecture options usage *
    
    This toolchain is built and optimized for Cortex-A/R/M bare metal development.
    the following table shows how to invoke GCC/G++ with correct command line
    options for variants of Cortex-A/R and Cortex-M architectures.
    
    --------------------------------------------------------------------------
    | Arm core   | Command Line Options                       | multilib     |
    |------------|--------------------------------------------|--------------|
    | Cortex-M0+ | -mthumb -mcpu=cortex-m0plus                | thumb        |
    | Cortex-M0  | -mthumb -mcpu=cortex-m0                    | /v6-m        |
    | Cortex-M1  | -mthumb -mcpu=cortex-m1                    |              |
    |            |--------------------------------------------|              |
    |            | -mthumb -march=armv6-m                     |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M3  | -mthumb -mcpu=cortex-m3                    | thumb        |
    |            |--------------------------------------------| /v7-m        |
    |            | -mthumb -march=armv7-m                     |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M4  | -mthumb -mcpu=cortex-m4                    | thumb        |
    | (No FP)    |--------------------------------------------| /v7e-m       |
    |            | -mthumb -march=armv7e-m                    |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M4  | -mthumb -mcpu=cortex-m4 -mfloat-abi=softfp | thumb        |
    | (Soft FP)  | -mfpu=fpv4-sp-d16                          | /v7e-m       |
    |            |--------------------------------------------| /fpv4-sp     |
    |            | -mthumb -march=armv7e-m -mfloat-abi=softfp | /softfp      |
    |            | -mfpu=fpv4-sp-d16                          |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M4  | -mthumb -mcpu=cortex-m4 -mfloat-abi=hard   | thumb        |
    | (Hard FP)  | -mfpu=fpv4-sp-d16                          | /v7e-m       |
    |            |--------------------------------------------| /fpv4-sp     |
    |            | -mthumb -march=armv7e-m -mfloat-abi=hard   | /hard        |
    |            | -mfpu=fpv4-sp-d16                          |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M7  | -mthumb -mcpu=cortex-m7                    | thumb        |
    | (No FP)    |--------------------------------------------| /v7e-m       |
    |            | -mthumb -march=armv7e-m                    |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M7  | -mthumb -mcpu=cortex-m7 -mfloat-abi=softfp | thumb        |
    | (Soft FP)  | -mfpu=fpv5-sp-d16                          | /v7e-m       |
    |            |--------------------------------------------| /fpv4-sp     |
    |            | -mthumb -march=armv7e-m -mfloat-abi=softfp | /softfp      |
    |            | -mfpu=fpv5-sp-d16                          |              |
    |            |--------------------------------------------|--------------|
    |            | -mthumb -mcpu=cortex-m7 -mfloat-abi=softfp | thumb        |
    |            | -mfpu=fpv5-d16                             | /v7e-m       |
    |            |--------------------------------------------| /fpv5        |
    |            | -mthumb -march=armv7e-m -mfloat-abi=softfp | /softfp      |
    |            | -mfpu=fpv5-d16                             |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M7  | -mthumb -mcpu=cortex-m7 -mfloat-abi=hard   | thumb        |
    | (Hard FP)  | -mfpu=fpv5-sp-d16                          | /v7e-m       |
    |            |--------------------------------------------| /fpv4-sp     |
    |            | -mthumb -march=armv7e-m -mfloat-abi=hard   | /hard        |
    |            | -mfpu=fpv5-sp-d16                          |              |
    |            |--------------------------------------------|--------------|
    |            | -mthumb -mcpu=cortex-m7 -mfloat-abi=hard   | thumb        |
    |            | -mfpu=fpv5-d16                             | /v7e-m       |
    |            |--------------------------------------------| /fpv5        |
    |            | -mthumb -march=armv7e-m -mfloat-abi=hard   | /hard        |
    |            | -mfpu=fpv5-d16                             |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M23 | -mthumb -mcpu=cortex-m23                   | thumb        |
    |            |--------------------------------------------| /v8-m.base   |
    |            | -mthumb -march=armv8-m.base                |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M33 | -mthumb -mcpu=cortex-m33                   | thumb        |
    |  (No FP)   |--------------------------------------------| /v8-m.main   |
    |            | -mthumb -march=armv8-m.main                |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-M33 | -mthumb -mcpu-cortex-m33                   | thumb        |
    | (Soft FP)  | -mfloat-abi=softfp -mfpu=fpv5-sp-d16       | /v8-m.main   |
    |            |--------------------------------------------| /fpv5-sp     |
    |            | -mthumb -march=armv8-m.main                | /softfp      |
    |            | -mfloat-abi=softfp -mfpu=fpv5-sp-d16       |              |
    |            |--------------------------------------------|--------------|
    |            | -mthumb -march=armv8-m.main                | thumb        |
    |            | -mfloat-abi=softfp -mfpu=fpv5-d16          | /v8-m.main   |
    |            |                                            | /fpv5        |
    |            |                                            | /softfp      |
    |------------|--------------------------------------------|--------------|
    | Cortex-M33 | -mthumb -mcpu=cortex-m33                   | thumb        |
    | (Hard FP)  | -mfloat-abi=hard -mfpu=fpv5-sp-d16         | /v8-m.main   |
    |            |--------------------------------------------| /fpv5-sp     |
    |            | -mthumb -march=armv8-m.main                | /hard        |
    |            | -mfloat-abi=hard -mfpu=fpv5-sp-d16         |              |
    |            |--------------------------------------------|--------------|
    |            | -mthumb -march=armv8-m.main                | thumb        |
    |            | -mfloat-abi=hard -mfpu=fpv5-d16            | /v8-m.main   |
    |            |                                            | /fpv5        |
    |            |                                            | /hard        |
    |------------|--------------------------------------------|--------------|
    | Cortex-R4  | [-mthumb] -march=armv7-r                   | thumb        |
    | Cortex-R5  |                                            | /v7-ar       |
    | Cortex-R7  |                                            |              |
    | Cortex-R8  |                                            |              |
    | (No FP)    |                                            |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-R4  | [-mthumb] -march=armv7-r -mfloat-abi=softfp| thumb        |
    | Cortex-R5  | -mfpu=vfpv3-d16                            | /v7-ar       |
    | Cortex-R7  |                                            | /fpv3        |
    | Cortex-R8  |                                            | /softfp      |
    | (Soft FP)  |                                            |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-R4  | [-mthumb] -march=armv7-r -mfloat-abi=hard  | thumb        |
    | Cortex-R5  | -mfpu=vfpv3-d16                            | /v7-ar       |
    | Cortex-R7  |                                            | /fpv3        |
    | Cortex-R8  |                                            | /hard        |
    | (Hard FP)  |                                            |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-R52 | [-mthumb] -mcpu=cortex-r52                 | thumb        |
    | (No FP)    |--------------------------------------------| /v7-ar       |
    |            | [-mthumb] -march=armv8-r+crc               |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-R52 | [-mthumb] -mcpu=cortex-r52                 | thumb        |
    | (Soft FP)  | -mfloat-abi=softfp -mfpu=neon-fp-armv8     | /v7-ar       |
    |            |--------------------------------------------| /fpv3        |
    |            | [-mthumb] -march=armv8-r+crc               | /softfp      |
    |            | -mfloat-abi=hard -mfpu=neon-fp-armv8       |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-R52 | [-mthumb] -mcpu=cortex-r52                 | thumb        |
    | (Hard FP)  | -mfloat-abi=hard -mfpu=neon-fp-armv8       | /v7-ar       |
    |            |--------------------------------------------| /fpv3        |
    |            | [-mthumb] -march=armv8-r+crc               | /hard        |
    |            | -mfloat-abi=hard -mfpu=neon-fp-armv8       |              |
    |------------|--------------------------------------------|--------------|
    | Cortex-A*  | [-mthumb] -march=armv7-a                   | thumb        |
    | (No FP)    |                                            | /v7-ar       |
    |------------|--------------------------------------------|--------------|
    | Cortex-A*  | [-mthumb] -march=armv7-a -mfloat-abi=softfp| thumb        |
    | (Soft FP)  | -mfpu=vfpv3-d16                            | /v7-ar       |
    |            |                                            | /fpv3        |
    |            |                                            | /softfp      |
    |------------|--------------------------------------------|--------------|
    | Cortex-A*  | [-mthumb] -march=armv7-a -mfloat-abi=hard  | thumb        |
    | (Hard FP)  | -mfpu=vfpv3-d16                            | /v7-ar       |
    |            |                                            | /fpv3        |
    |            |                                            | /hard        |
    --------------------------------------------------------------------------
    
    * C Libraries usage *
    
    This toolchain is released with two prebuilt C libraries based on newlib:
    one is the standard newlib and the other is newlib-nano for code size.
    To distinguish them, we rename the size optimized libraries as:
    
      libc.a --> libc_nano.a
      libg.a --> libg_nano.a
    
    To use newlib-nano, users should provide additional gcc compile and link time
    option:
     --specs=nano.specs
    
    At compile time, a 'newlib.h' header file especially configured for newlib-nano
    will be used if --specs=nano.specs is passed to the compiler.
    
    Nano.specs also handles two additional gcc libraries: libstdc++_nano.a and
    libsupc++_nano.a, which are optimized for code size.
    
    For example:
    $ arm-none-eabi-gcc src.c --specs=nano.specs $(OTHER_OPTIONS)
    
    This option can also work together with other specs options like
    --specs=rdimon.specs
    
    Please note that --specs=nano.specs is a both a compiler and linker option.  Be
    sure to include in both compiler and linker options if compiling and linking
    are separated.
    
    ** additional newlib-nano libraries usage
    
    Newlib-nano is different from newlib in addition to the libraries' name.
    Formatted input/output of floating-point number are implemented as weak symbol.
    If you want to use %f, you have to pull in the symbol by explicitly specifying
    "-u" command option.
    
      -u _scanf_float
      -u _printf_float
    
    e.g. to output a float, the command line is like:
    $ arm-none-eabi-gcc --specs=nano.specs -u _printf_float $(OTHER_LINK_OPTIONS)
    
    For more about the difference and usage, please refer the README.nano in the
    source package.
    
    Users can choose to use or not use semihosting by following instructions.
    ** semihosting
    If you need semihosting, linking like:
    $ arm-none-eabi-gcc --specs=rdimon.specs $(OTHER_LINK_OPTIONS)
    
    ** non-semihosting/retarget
    If you are using retarget, linking like:
    $ arm-none-eabi-gcc --specs=nosys.specs $(OTHER_LINK_OPTIONS)
    
    * Linker scripts & startup code *
    
    Latest update of linker scripts template and startup code is available on
    https://developer.arm.com/embedded/cmsis
    
    * Samples *
    Examples of all above usages are available at:
    $install_dir/gcc-arm-none-eabi-*/share/gcc-arm-none-eabi/samples
    
    Read readme.txt under it for further information.
    
    * GDB Server for CMSIS-DAP based hardware debugger *
    CMSIS-DAP is the interface firmware for a Debug Unit that connects
    the Debug Port to USB.  More detailed information can be found at
    http://www.keil.com/support/man/docs/dapdebug/.
    
    A software GDB server is required for GDB to communicate with CMSIS-DAP based
    hardware debugger.  The pyOCD is an implementation of such GDB server that is
    written in Python and under Apache License.
    
    For those who are using this toolchain and have board with CMSIS-DAP based
    debugger, the pyOCD is our recommended gdb server.  More information can be
    found at https://github.com/mbedmicro/pyOCD.
    

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