# DEFAULTTUNE overridden on imx8mprsb3720a2

**URL:** <https://forum.aim-linux.advantech.com/t/defaulttune-overridden-on-imx8mprsb3720a2/917>\
**Category:** Technical Supports\
**Tags:** imx8mplus, rsb-3720\
**Created:** [December 11, 2024, 11:00am UTC](https://forum.aim-linux.advantech.com/t/defaulttune-overridden-on-imx8mprsb3720a2/917 "2024-12-11T11:00:17Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Vasco\_Santos](https://avatars.discourse-cdn.com/v4/letter/v/9de0a6/32.png) [@Vasco\_Santos](https://forum.aim-linux.advantech.com/u/Vasco_Santos)\
**Post date:** [December 11, 2024, 11:00am UTC](https://forum.aim-linux.advantech.com/t/defaulttune-overridden-on-imx8mprsb3720a2/917/1 "2024-12-11T11:00:17Z")

</div>

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:

```auto
# $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?

---

<div class="post-metadata">

**Author:** ![Clayder\_Huang](https://avatars.discourse-cdn.com/v4/letter/c/48db29/32.png) [@Clayder\_Huang](https://forum.aim-linux.advantech.com/u/Clayder_Huang)\
**Post date:** [December 12, 2024, 2:10am UTC](https://forum.aim-linux.advantech.com/t/defaulttune-overridden-on-imx8mprsb3720a2/917/2 "2024-12-12T02:10:53Z")

</div>

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

---

<div class="post-metadata">

**Author:** ![Vasco\_Santos](https://avatars.discourse-cdn.com/v4/letter/v/9de0a6/32.png) [@Vasco\_Santos](https://forum.aim-linux.advantech.com/u/Vasco_Santos)\
**Post date:** [December 12, 2024, 9:15am UTC](https://forum.aim-linux.advantech.com/t/defaulttune-overridden-on-imx8mprsb3720a2/917/3 "2024-12-12T09:15:42Z")

</div>

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](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.

---

<div class="post-metadata">

**Author:** ![Vasco\_Santos](https://avatars.discourse-cdn.com/v4/letter/v/9de0a6/32.png) [@Vasco\_Santos](https://forum.aim-linux.advantech.com/u/Vasco_Santos)\
**Post date:** [December 16, 2024, 11:15am UTC](https://forum.aim-linux.advantech.com/t/defaulttune-overridden-on-imx8mprsb3720a2/917/4 "2024-12-16T11:15:26Z")

</div>

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:

```auto
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?

---

<div class="post-metadata">

**Author:** ![Winston.Huang](https://avatars.discourse-cdn.com/v4/letter/w/4da419/32.png) [@Winston.Huang](https://forum.aim-linux.advantech.com/u/Winston.Huang)\
**Post date:** [December 17, 2024, 7:05am UTC](https://forum.aim-linux.advantech.com/t/defaulttune-overridden-on-imx8mprsb3720a2/917/5 "2024-12-17T07:05:57Z")

</div>

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:

```auto
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`:

```auto
TUNE_FEATURES = "aarch64 armv8a crc crypto neon cortexa53"

```

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

 ![圖片](https://us1.discourse-cdn.com/flex016/uploads/aim_linux/original/2X/6/622e1074e3874ce314f5202544eff1f355d3539a.png)