meta-arm/meta-arm-toolchain

meta-arm-toolchain Yocto Layer

This layer contains recipes for the prebuilt GNU Arm toolchains.

Information regarding contributing, reporting bugs, etc can be found in the top-level meta-arm readme file.

Recipes for pre-built GNU Arm toolchain for Linux development are provided under recipes-devtools/external-arm-toolchain/.

external-arm-toolchain.bb ~~~~~~~~~~~~~~~~~~~~~~~~~

This recipe provides support for pre-built GNU toolchains targeting processors from the Arm Cortex-A family and implementing the Arm A-profile architecture.

Usage ^^^^^

In order to use any of pre-built Arm toolchain versions (8.2, 8.3, 9.2 and so on), a user needs to download and untar tool-set on host machine at a particular installation path eg: /opt/toolchain/. Then user needs to specify following in conf/local.conf in order to replace OE toolchain with pre-built GNU-A toolchain:

TCMODE = "external-arm" EXTERNAL_TOOLCHAIN = ""

• Eg. for AArch64 (eg. qemuarm64 machine in poky distro) EXTERNAL_TOOLCHAIN = "\ /gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu \ "

• Eg. for AArch32 (eg. qemuarm machine in poky distro) EXTERNAL_TOOLCHAIN = "\ /gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf \ "

Supported distros and machines ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Since this pre-built GNU-A tool-set simply replaces OE toolchain, so it is meant to be distro and machine agnostic as long as one is cross-compiling for Arm A-profile architecture.

Tested distro and machines (for zeus stable release):

1. Distro: poky; machines: qemuarm and qemuarm64 (build and boot tested)
2. Distro: RPB; machines: dragonboard-410c (build and boot tested)
3. Distro: world; machines: qemuarm and qemuarm64. Build tested for following layers:
   • poky/meta
   • poky/meta-poky
   • poky/meta-yocto-bsp
   • meta-openembedded/meta-oe
   • meta-openembedded/meta-python
   • meta-openembedded/meta-networking

SDK support ^^^^^^^^^^^

Pre-built toochain provides support to build OE SDK which has been tested using following commands:

$ bitbake core-image-base -c populate_sdk $ bitbake core-image-base -c testsdk

Note: Currently generated SDK only uses glibc provided by pre-built toolchain.

  The cross compiler, binutils, gdb/gdbserver etc. are built from source.
  This is something we would like to improve in future in order to package
  most of the components from pre-built toolchain instead.

Pre-built Arm toolchain for bare-metal development

Recipes for pre-built GNU Arm toolchain for bare-metal development are provided under recipes-devtools/external-arm-toolchain/.

gcc-arm-none-eabi_.bb ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This recipe provides support for pre-built GNU Arm Embedded toolchain for bare-metal software development on devices based on 32-bit Arm Cortex-A, Cortex-R and Cortex-M processors.

Supported version: 9-2019-q4-major

gcc-aarch64-none-elf_.bb ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This recipe provides support for pre-built GNU Arm toolchain for bare-metal software development on devices based on 64-bit Arm Cortex-A processors.

Supported version: 9.2-2019.12

Layer maintainer(s)

• Sumit Garg sumit.garg@linaro.org
• Denys Dmytriyenko denis@denix.org