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

[Phil Yang <Phil.Yang@arm.com>]

Hi Jerin,

Your insight would be much appreciated.

Thanks,
Phil

> -----Original Message-----
> From: Ruifeng Wang <Ruifeng.Wang@arm.com>
> Sent: Wednesday, May 27, 2020 4:29 PM
> To: Phil Yang <Phil.Yang@arm.com>; dev@dpdk.org
> Cc: thomas@monjalon.net; david.marchand@redhat.com;
> jerinj@marvell.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>; Joyce Kong <Joyce.Kong@arm.com>; nd
> <nd@arm.com>; stable@dpdk.org
> Subject: RE: [dpdk-dev] [PATCH 2/2] doc: add aarch32 build guidance
> 
> 
> > -----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>