DEFAULTTUNE overridden on imx8mprsb3720a2

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1

Hi,

I have set up a mickledore build environment for my RSB3720(A2) board using:

EULA=1 MACHINE=imx8mprsb3720a2 UBOOT_CONFIG=4G DISTRO=fsl-imx-xwayland source imx-setup-release.sh -b build

When I look at the DEFAULTTUNE variable with bitbake -e, I see it being set correctly to "cortexa53-crypto" in the meta-advantech layer, but then it gets overridden by the meta-imx layer:

# $DEFAULTTUNE [27 operations]
#   set /home/adv/adv-release-bsp/build_tmp/conf/local.conf:24
#     "cortexa53-crypto"
#   set? /home/adv/adv-release-bsp/sources/poky/meta/conf/machine/include/arm/armv8a/tune-cortexa53.inc:1
#     "cortexa53"
#   set? /home/adv/adv-release-bsp/sources/poky/meta/conf/machine/include/arm/arch-armv8a.inc:1
#     "armv8a-crc"
#   set? /home/adv/adv-release-bsp/sources/poky/meta/conf/machine/include/arm/arch-arm64.inc:1
#     "aarch64"
#   set? /home/adv/adv-release-bsp/sources/poky/meta/conf/machine/include/arm/arch-armv7ve.inc:1
#     "armv7vethf"
#   set? /home/adv/adv-release-bsp/sources/poky/meta/conf/machine/include/arm/arch-armv7a.inc:1
#     "armv7athf"
#   set? /home/adv/adv-release-bsp/sources/poky/meta/conf/machine/include/arm/arch-armv6.inc:1
#     "armv6hf"
#   set? /home/adv/adv-release-bsp/sources/poky/meta/conf/machine/include/arm/arch-armv5.inc:1
#     "armv5"
#   set? /home/adv/adv-release-bsp/sources/poky/meta/conf/machine/include/arm/arch-armv4.inc:1
#     "armv4"
#   override[mx6-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:157
#     "cortexa9thf-neon"
#   override[mx6ul-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:158
#     "cortexa7thf-neon"
#   override[mx6ull-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:159
#     "cortexa7thf-neon"
#   override[mx6ulz-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:160
#     "cortexa7thf-neon"
#   override[mx7-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:161
#     "cortexa7thf-neon"
#   override[vf-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:162
#     "cortexa5thf-neon"
#   override[mx8m-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:164
#     "cortexa53-crypto"
#   override[mx8qm-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:165
#     "cortexa72-cortexa53-crypto"
#   override[mx8x-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:166
#     "cortexa35-crypto"
#   override[mx8ulp-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:167
#     "cortexa35-crypto"
#   override[mx93-generic-bsp]:set? /home/adv/adv-release-bsp/sources/meta-freescale/conf/machine/include/imx-base.inc:168
#     "cortexa55"
#   override[use-mainline-bsp]:set /home/adv/adv-release-bsp/sources/meta-advantech/meta-fsl-imx/conf/machine/include/adv-imx8mp-evk.inc:9
#     "cortexa53-crypto"
#   override[mx8-nxp-bsp]:set? /home/adv/adv-release-bsp/sources/meta-imx/meta-sdk/conf/distro/include/fsl-imx-base.inc:23
#     "armv8a-crc-crypto"
#   override[mx8m-nxp-bsp]:set? /home/adv/adv-release-bsp/sources/meta-imx/meta-sdk/conf/distro/include/fsl-imx-base.inc:24
#     "armv8a-crc-crypto"
#   override[mx8qm-nxp-bsp]:set? /home/adv/adv-release-bsp/sources/meta-imx/meta-sdk/conf/distro/include/fsl-imx-base.inc:25
#     "armv8a-crc-crypto"
#   override[mx8x-nxp-bsp]:set? /home/adv/adv-release-bsp/sources/meta-imx/meta-sdk/conf/distro/include/fsl-imx-base.inc:26
#     "armv8a-crc-crypto"
#   override[mx8ulp-nxp-bsp]:set? /home/adv/adv-release-bsp/sources/meta-imx/meta-sdk/conf/distro/include/fsl-imx-base.inc:27
#     "armv8a-crc-crypto"
#   override[mx93-nxp-bsp]:set? /home/adv/adv-release-bsp/sources/meta-imx/meta-sdk/conf/distro/include/fsl-imx-base.inc:28
#     "armv8a-crc-crypto"
# pre-expansion value:
#   "armv8a-crc-crypto"
DEFAULTTUNE="armv8a-crc-crypto"

As a result, my TARGET_FPU is not set to "hard" and TUNE_FEATURES does not include neon, etc.

I have tried adding a DEFAULTTUNE = "cortexa53-crypto" in my overall conf/local.conf, but it also gets overridden by meta-imx.

How do I get around this and make sure the proper machine optimizations are enabled?

2

Hello @Vasco_Santos
Please help to check your BSP version.
We need to check your version.

https://ess-wiki.advantech.com.tw/view/AIM-Linux/RSB-3720

3

Hi @Clayder_Huang,

I am currently building Yocto 4.2 (Kernel 6.1.22).
I have been following the instructions at
https://ess-wiki.advantech.com.tw/view/IoTGateway/BSP/Linux/iMX8/Yocto_LBVD_User_Guide#Build_Instructions.

This is how I init my repo:
repo init -u https://github.com/ADVANTECH-Corp/adv-arm-yocto-bsp.git -b imx-linux-mickledore -m adv-6.1.22-2.0.0.xml

Regards,
Vasco.

4

When I disassemble the library /usr/lib/libonnxruntime.so.1.13.1 in my BSP, for example, I cannot find any calls to NEON instructions.
If I do the same for the x86_64 libonnxruntime on my computer, I find many SSE/AVX instructions.

My build configuration looks like this:

Build Configuration:
BB_VERSION           = "2.4.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "universal"
TARGET_SYS           = "aarch64-poky-linux"
MACHINE              = "imx8mprsb3720a2"
DISTRO               = "fsl-imx-xwayland"
DISTRO_VERSION       = "6.1-mickledore"
TUNE_FEATURES        = "aarch64 armv8a crc crypto"
TARGET_FPU           = ""

I was expecting at least neon or cortexa53 to be part of TUNE_FEATURES.
I think this is related to the override in my DEFAULTTUNE variable.

Or, is this expected?

5

Hi Vasco,

Thank you for your inquiry. The reason you’re not seeing NEON instructions in the disassembled libonnxruntime.so.1.13.1 library is because the current TUNE_FEATURES configuration does not enable NEON or Cortex-A53 optimizations.

Your configuration:

TUNE_FEATURES = "aarch64 armv8a crc crypto"

does not include neon or cortexa53, which are necessary for enabling SIMD (NEON) and ARM-specific optimizations.

Update your TUNE_FEATURES to explicitly include neon and cortexa53:

TUNE_FEATURES = "aarch64 armv8a crc crypto neon cortexa53"

This will ensure that NEON and Cortex-A53 optimizations are enabled during the build.

εœ–η‰‡
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