.. SPDX-License-Identifier: BSD-3-Clause
- Copyright(c) 2020 ARM Corporation.
+ Copyright(c) 2021 ARM Corporation.
-Cross compiling DPDK for ARM64
-==============================
-This chapter describes how to cross compile DPDK for ARM64 from x86 build hosts.
+Cross compiling DPDK for aarch64 and aarch32
+============================================
+
+This chapter describes how to cross compile DPDK for aarch64 on x86 build
+machine and compile 32-bit aarch32 DPDK on aarch64 build machine.
.. note::
- Whilst it is recommended to natively build DPDK on ARM64 (just
- like with x86), it is also possible to cross compile DPDK for ARM64.
- An ARM64 cross compiler GNU toolchain or an LLVM/clang toolchain
+ Whilst it is recommended to natively build DPDK on aarch64 (just
+ like with x86), it is also possible to cross compile DPDK for aarch64.
+ An aarch64 cross compiler GNU toolchain or an LLVM/clang toolchain
may be used for cross-compilation.
sudo apt install pkg-config-aarch64-linux-gnu
+For aarch32, install ``pkg-config-arm-linux-gnueabihf``::
+
+ sudo apt install pkg-config-arm-linux-gnueabihf
+
GNU toolchain
-------------
.. _obtain_GNU_toolchain:
-Obtain the cross toolchain
-~~~~~~~~~~~~~~~~~~~~~~~~~~
+Get the cross toolchain
+~~~~~~~~~~~~~~~~~~~~~~~
The latest GNU cross compiler toolchain can be downloaded from:
https://developer.arm.com/open-source/gnu-toolchain/gnu-a/downloads.
As of this writing 9.2-2019.12 is the newest,
the following description is an example of this version.
-.. code-block:: console
+For aarch64::
wget https://developer.arm.com/-/media/Files/downloads/gnu-a/9.2-2019.12/binrel/gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu.tar.xz
-
-Unzip and add into the PATH
-~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-.. code-block:: console
-
tar -xvf gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu.tar.xz
export PATH=$PATH:<cross_install_dir>/gcc-arm-9.2-2019.12-x86_64-aarch64-none-linux-gnu/bin
+For aarch32::
+
+ wget https://developer.arm.com/-/media/Files/downloads/gnu-a/9.2-2019.12/binrel/gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf.tar.xz
+ tar -xvf gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf.tar.xz
+ export PATH=$PATH:<cross_install_dir>/gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf/bin
+
.. note::
- For the host requirements and other info, refer to the release note section: https://releases.linaro.org/components/toolchain/binaries/
+ For the host requirements and other info, refer to the release note section:
+ https://releases.linaro.org/components/toolchain/binaries/
.. _augment_the_gnu_toolchain_with_numa_support:
meson aarch64-build-gcc --cross-file config/arm/arm64_armv8_linux_gcc
ninja -C aarch64-build-gcc
+If the target machine is aarch32 we can use the following command::
+
+ meson aarch32-build --cross-file config/arm/arm32_armv8_linux_gcc
+ ninja -C aarch32-build
LLVM/Clang toolchain
--------------------
meson aarch64-build-clang --cross-file config/arm/arm64_armv8_linux_clang_ubuntu1804
ninja -C aarch64-build-clang
-Supported cross-compilation targets
------------------------------------
-
-If you wish to build for a target which is not among the current cross-files,
-you may use various combinations of implementer/part number::
-
- Supported implementers:
- 'generic': Generic armv8
- '0x41': Arm
- '0x43': Cavium
- '0x50': Ampere Computing
- '0x56': Marvell ARMADA
- 'dpaa': NXP DPAA
-
- Supported part_numbers for generic:
- 'generic': valid for all armv8-a architectures (unoptimized portable build)
-
- Supported part_numbers for 0x41, 0x56, dpaa:
- '0xd03': cortex-a53
- '0xd04': cortex-a35
- '0xd09': cortex-a73
- '0xd0a': cortex-a75
- '0xd0b': cortex-a76
- '0xd0c': neoverse-n1
-
- Supported part_numbers for 0x43:
- '0xa1': thunderxt88
- '0xa2': thunderxt81
- '0xa3': thunderxt83
- '0xaf': thunderx2t99
- '0xb2': octeontx2
-
- Supported part_numbers for 0x50:
- '0x0': emag
-
-Other cross file options
-------------------------
-
-There are other options you may specify in a cross file to tailor the build::
-
- Supported extra configuration
- max_numa_nodes = n # will set RTE_MAX_NUMA_NODES
- max_lcores = n # will set RTE_MAX_LCORE
-
- numa = false # set to false to force building for a non-NUMA system
- # if not set or set to true, the build system will build for a NUMA
- # system only if libnuma is installed
-
- disable_drivers = 'bus/dpaa,crypto/*' # add disabled drivers
- # valid values are dir/subdirs in the drivers directory
- # wildcards are allowed
-
- enable_drivers = 'common/*,bus/*' # build only these drivers
- # valid values are dir/subdirs in the drivers directory
- # wildcards are allowed
+Building for an aarch64 SoC on an aarch64 build machine
+-------------------------------------------------------
+
+If you wish to build on an aarch64 build machine for a different aarch64 SoC,
+you don't need a separate cross toolchain, just a different set of
+configuration options. To build for an aarch64 SoC, use the -Dplatform meson
+option::
+
+ meson soc_build -Dplatform=<target_soc>
+
+Substitute <target_soc> with one of the supported SoCs
+
+.. literalinclude:: ../../../config/arm/meson.build
+ :start-after: Start of SoCs list
+ :end-before: End of SoCs list
+
+These SoCs are also used in cross files, e.g.::
+
+ [properties]
+ # Generate binaries that are portable across all Armv8 machines
+ platform = 'generic'
+
+Supported SoC configuration
+---------------------------
+
+The SoC configuration is a combination of implementer and CPU part number
+configuration and SoC-specific configuration::
+
+ soc_<name> = {
+ 'description': 'SoC Description', # mandatory
+ 'implementer': <implementer_id>, # mandatory
+ 'part_number': <part_number>, # mandatory
+ 'numa': false, # optional, specify for non-NUMA SoCs
+ 'enable_drivers': 'common/*,bus/*', # optional, comma-separated list of
+ # drivers to build, wildcards are accepted
+ 'disable_drivers': 'crypto/*', # optional, comma-separated list of
+ # drivers to disable, wildcards are accepted
+ 'flags': [
+ ['RTE_MAX_LCORE', '16'],
+ ['RTE_MAX_NUMA_NODES', '1']
+ ] # optional, list of DPDK options that will be added
+ # or overwritten
+ }
+
+Where <implementer_id> is a key defined in the implementers dictionary
+in config/arm/meson.build (e.g. 0x41) and part_number is a key defined
+in implementers[<implementer_id>]['part_number_config'] dictionary
+(i.e. the part number must be defined for the implementer,
+e.g. for 0x41, a valid value is 0xd49, which is the neoverse-n2 SoC).
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