px4-firmware/misc/buildroot/ReleaseNotes

ReleaseNotes v0.1.11
====================

Supported Toolchains
--------------------

This is a highly hacked up version of the buildroot (see
http://buildroot.uclibc.org/). It has been hacked so that it
can be used to build the following NuttX-compatible toolchains:

  o arm-elf toolchain needed for use with the TI C5471 (ARM7TDMI),
    NXP LPC214x (ARM7TMDI), STMicro STR71x (ARM7TDMI), Freescale
    i.MX1 (ARM920T), and TI DM320 (ARM926EJ-S) provided with the
    NuttX releases.

    NXFLAT toolchain for use with the ARM7 and ARM9.

  o arm-elf ARM Cortex-M3 (thumb2) toolchain needed for use with
    the Luminary LM3Sxxx, NXP 17xxxx, Atmel SAM3u, and STMicro
    STM32 ports provided with the NuttX releases.

    NXFLAT toolchain for use with the ARM Cortex-M3.

  o avr-elf toolchain needed for use with the ATmega128 ports
    provided with the NuttX releases.

  o H8/300 toolchain (not currently used in any NuttX
    configuration).

  o i486-elf toochain.  Why would you want such a thing?  On Linux, of 
    course, such a thing is not needed because you can use the installed GCC 
    to build i486 ELF binaries.  But that will not work under Cygwin!  The
    Cygwin toolchain (and probably MinGW), build DOS MZ format executables
    (i.e., .exe files).  That is probably not usable for most NuttX targets.
    Instead, you should use this i486-elf-gcc to generate true ELF binaries
    under Cygwin.

  o bfin-elf toolchain not currently used in any NuttX
    configuration).

  o m68k-elf toolchain (not currently used in any NuttX
    configuration).

  o m68hc11-elf toolchain (not currently used in any NuttX
    configuration).

  o m68hc12-elf toolchain. (NOT RECOMMENDED for hcs12;
    Use m9s12x-elf toolchain)

  o m9s12x-elf toolchain Supports Freescale m9s12x using
    binutils 2.18 and gcc 3.3.6 and patches available from
    http://www.msextra.com/tools courtesy of James Cortina.

  o m32c-elf toolchain needed for the Renesas M16C NuttX port.

  o sh-elf toolchain needed for the SH-1 NuttX port.

Supported tool versions include:

  o gcc-3.3.6 + binuils-2.18 (for m9s12x).
  o gcc-3.4.6 + binutils-2.17
  o gcc-4.2.4 + binutils-2.19
  o gcc-4.3.3 + binutils-2.19.1
  o gcc-4.5.2 + binutils-2.21
  o gcc-4.6.3 + binutils-2.22

See the ChangeLog of features/architectures added in v0.1.11.

Installation instructions:

  - You must have already configured Nuttx in <some-dir>/nuttx
  - download the buildroot package into <some-dir>
  - unpack -cd <some-dir>/buildroot
  - cp configs/arm-defconfig .config
  - make oldconfig
  - make

See configs/README.txt for other configurations and for more detailed
instructions.  If your NuttX installation resides at a different location
then:

  - make menuconfig

And set the "Path to the NuttX root directory" appropriately.

Version Information
-------------------

buildroot release 1.11 corresponds to SVN revision r5313.

Note that all SVN information has been stripped from the tarball.  If you
need the SVN configuration, you should check out directly from SVN.  Revision
r5313 should equivalent to release 1.0 of NuttX buildroot:

    svn checkout -r5313 svn://svn.code.sf.net/p/nuttx/code/trunk nuttx-code

Or

    svn checkout -r5313 http://svn.code.sf.net/p/nuttx/code/trunk nuttx-code

NXFLAT Toolchain Build
----------------------

You can select to build the NXFLAT toolchain with GCC by selecting
the NXFLAT toolchin during the configuration process(you can also
select omit building GCC with and only build the NXFLAT toolchain
for use with your own GCC toolchain.

NOTES:
  - NFFLAT is only available for ARM and Cortex-M3 architectures.
  - The GCC 4.6.3 will not work with NXFLAT.  See "Toolchain Compatibility
    Problem" at http://www.nuttx.org/doku.php?id=wiki:vfs:nxflat for details.