Hi Jerin,

Your insight would be much appreciated.

Thanks,
Phil

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

quoted

-----Original Message-----
From: dev <redacted> 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
[off-list ref]; Gavin Hu (Arm Technology China)
[off-list ref]; Joyce Kong (Arm Technology China)
[off-list ref]; nd [off-list ref]; 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 <redacted>
Reviewed-by: Gavin Hu <redacted>
Tested-by: Joyce Kong <redacted>

---
 .../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

quoted

hosts.
+Cross compile DPDK for aarch64 and aarch32
+==========================================
+This chapter describes how to cross-compile DPDK for aarch64 from x86

and

quoted

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.

quoted

+
+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 <redacted>