Re: [dpdk-dev] [PATCH 2/2] doc: add aarch32 build guidance

[Ruifeng Wang <Ruifeng.Wang@arm.com>]

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Phil Yang
> Sent: Monday, November 11, 2019 6:34 PM
> To: dev@dpdk.org
> Cc: thomas@monjalon.net; david.marchand@redhat.com;
> jerinj@marvell.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>; Gavin Hu (Arm Technology China)
> <Gavin.Hu@arm.com>; Joyce Kong (Arm Technology China)
> <Joyce.Kong@arm.com>; nd <nd@arm.com>; stable@dpdk.org
> Subject: [dpdk-dev] [PATCH 2/2] doc: add aarch32 build guidance
> 
> Add a guidance for aarch64 natively build 32-bit aarch32 DPDK.
> 
> Cc: stable@dpdk.org
> 
> Signed-off-by: Phil Yang <phil.yang@arm.com>
> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
> Tested-by: Joyce Kong <joyce.kong@arm.com>
> 
> ---
>  .../linux_gsg/cross_build_dpdk_for_arm64.rst       | 36
> ++++++++++++++++++----
>  1 file changed, 30 insertions(+), 6 deletions(-)
> 
> diff --git a/doc/guides/linux_gsg/cross_build_dpdk_for_arm64.rst
> b/doc/guides/linux_gsg/cross_build_dpdk_for_arm64.rst
> index e799b0b..409d444 100644
> --- a/doc/guides/linux_gsg/cross_build_dpdk_for_arm64.rst
> +++ b/doc/guides/linux_gsg/cross_build_dpdk_for_arm64.rst
> @@ -1,15 +1,15 @@
>  ..  SPDX-License-Identifier: BSD-3-Clause
>      Copyright(c) 2018 ARM Corporation.
> 
> -Cross compile DPDK for ARM64
> -============================
> -This chapter describes how to cross compile DPDK for ARM64 from x86 build
> hosts.
> +Cross compile DPDK for aarch64 and aarch32
> +==========================================
> +This chapter describes how to cross-compile DPDK for aarch64 from x86 and
> compile 32-bit aarch32 DPDK from aarch64 build hosts.
> 
>  .. note::
> 
> -   Whilst it is recommended to natively build DPDK on ARM64 (just
> -   like with x86), it is also possible to cross-build DPDK for ARM64. An
> -   ARM64 cross compile GNU toolchain is used for this.
> +   Whilst it is recommended to natively build DPDK on aarch64 (just
> +   like with x86), it is also possible to cross-build DPDK for aarch64. An
> +   aarch64 cross compile GNU toolchain is used for this.
> 
>  Obtain the cross tool chain
>  ---------------------------
> @@ -133,3 +133,27 @@ command::
> 
>  	meson arm64-build --cross-file config/arm/arm64_armv8_linux_gcc
>  	ninja -C arm64-build
> +
> +Compiling DPDK for aarch32/armv7 on aarch64 host
> +------------------------------------------
> +
> +Some aarch64 platforms support EL0 aarch32 mode, so the 32-bit aarch32
> +applications and the legacy 32-bit armv7 applications can run in this mode.
> +With the GNU C compiler for the armhf architecture toolchain
> +gcc-arm-linux-gnueabihf, it can generate aarch32 binary on aarch64 natively.
> +
> +For Example, in 64-bit Debian, we can use the following command to build
> 32-bit armv7 DPDK on aarch64 natively:
> +
> +Install cross compile toolchain for the armhf architecure.
> +command::
> +
> +	dpkg --add-architecture armhf
> +	apt-get update
> +	apt-get install -y gcc gcc-arm-linux-gnueabihf libc6:armhf make
> +binutils
> +
> +Build DPDK arm-armv7a-linuxapp-gcc executables.
> +command::
> +
> +	cd <dpdk_folder>
> +	make config CROSS=arm-linux-gnueabihf- T=arm-armv7a-linuxapp-
> gcc
> +	make -j CROSS=arm-linux-gnueabihf- T=arm-armv7a-linuxapp-gcc
> +RTE_DEVEL_BUILD=n
> --
> 2.7.4

Acked-by: Ruifeng Wang <ruifeng.wang@arm.com>