100 lines
3.3 KiB
Markdown
100 lines
3.3 KiB
Markdown
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meta-arm-toolchain Yocto Layer
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==============================
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This layer contains recipes for the prebuilt GNU Arm toolchains.
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Information regarding contributing, reporting bugs, etc can be found in the
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top-level meta-arm readme file.
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Recipes for pre-built GNU Arm toolchain for Linux development are provided under
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``recipes-devtools/external-arm-toolchain/``.
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external-arm-toolchain.bb
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~~~~~~~~~~~~~~~~~~~~~~~~~
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This recipe provides support for pre-built GNU toolchains targeting processors
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from the Arm Cortex-A family and implementing the Arm A-profile architecture.
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Usage
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^^^^^
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In order to use any of pre-built Arm toolchain versions (8.2, 8.3, 9.2 and so
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on), a user needs to download and untar tool-set on host machine at a particular
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installation path eg: ``/opt/toolchain/``. Then user needs to specify following
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in ``conf/local.conf`` in order to replace OE toolchain with pre-built GNU-A
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toolchain:
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TCMODE = "external-arm"
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EXTERNAL_TOOLCHAIN = "<path-to-the-toolchain>"
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- Eg. for AArch64 (eg. qemuarm64 machine in poky distro)
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EXTERNAL_TOOLCHAIN = "\
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<installation-path>/gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu \
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"
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- Eg. for AArch32 (eg. qemuarm machine in poky distro)
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EXTERNAL_TOOLCHAIN = "\
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<installation-path>/gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf \
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"
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Supported distros and machines
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Since this pre-built GNU-A tool-set simply replaces OE toolchain, so it is
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meant to be distro and machine agnostic as long as one is cross-compiling for
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Arm A-profile architecture.
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Tested distro and machines (for zeus stable release):
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1. Distro: poky; machines: qemuarm and qemuarm64 (build and boot tested)
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2. Distro: RPB; machines: dragonboard-410c (build and boot tested)
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3. Distro: world; machines: qemuarm and qemuarm64. Build tested for following
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layers:
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- poky/meta
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- poky/meta-poky
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- poky/meta-yocto-bsp
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- meta-openembedded/meta-oe
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- meta-openembedded/meta-python
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- meta-openembedded/meta-networking
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SDK support
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^^^^^^^^^^^
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Pre-built toochain provides support to build OE SDK which has been tested using
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following commands:
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$ bitbake core-image-base -c populate_sdk
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$ bitbake core-image-base -c testsdk
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Note: Currently generated SDK only uses glibc provided by pre-built toolchain.
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The cross compiler, binutils, gdb/gdbserver etc. are built from source.
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This is something we would like to improve in future in order to package
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most of the components from pre-built toolchain instead.
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Pre-built Arm toolchain for bare-metal development
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--------------------------------------------------
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Recipes for pre-built GNU Arm toolchain for bare-metal development are provided
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under ``recipes-devtools/external-arm-toolchain/``.
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gcc-arm-none-eabi_<version>.bb
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This recipe provides support for pre-built GNU Arm Embedded toolchain for
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bare-metal software development on devices based on 32-bit Arm Cortex-A,
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Cortex-R and Cortex-M processors.
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Supported version: 9-2019-q4-major
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gcc-aarch64-none-elf_<version>.bb
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This recipe provides support for pre-built GNU Arm toolchain for bare-metal
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software development on devices based on 64-bit Arm Cortex-A processors.
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Supported version: 9.2-2019.12
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Layer maintainer(s)
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-------------------
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* Sumit Garg <sumit.garg@linaro.org>
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* Denys Dmytriyenko <denis@denix.org>
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