VIA Technologies ARTiGO A935 User manual

QUICK START GUIDE
VIA ARTiGO A935
Yocto 3.1 EVK
1.00-21032023

Copyright
Copyright © 2023 VIA Technologies Incorporated. All rights reserved.
No part of this document may be reproduced, transmied, transcribed, stored in a retrieval system, or translated into any language, in any
form or by any means, electronic, mechanical, magnec, opcal, chemical, manual or otherwise without the prior wrien permission of
VIA Technologies, Incorporated.
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Disclaimer
VIA Technologies makes no warranes, implied or otherwise, in regard to this document and to the products described in this document.
The informaon provided in this document is believed to be accurate and reliable as of the publicaon date of this document. However,
VIA Technologies assumes no responsibility for the use or misuse of the informaon (including use or connecon of extra device/
equipment/add-on card) in this document and for any patent infringements that may arise from the use of this document. The informaon
and product specicaons within this document are subject to change at any me, without noce and without obligaon to nofy any
person of such change.
VIA Technologies, Inc. reserves the right the make changes to the products described in this manual at any me without prior noce.
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VIA ARTiGO A935 Yocto 3.1 EVK Quick Start Guide
Revision History
Version Date Remarks
1.00 21/03/2023 Inial release

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VIA ARTiGO A935 Yocto 3.1 EVK Quick Start Guide
Table of Contents
1. Introducon.................................................................................................................................................... 1
1.1 EVK Package Contents........................................................................................................................... 1
1.1.1 Firmware Folder Contents ............................................................................................................. 1
1.1.2 Document Folder Contents............................................................................................................ 1
1.1.3 Tool Folder Contents...................................................................................................................... 1
1.2 Version Informaon and Supported Features....................................................................................... 2
2. Image Installaon .......................................................................................................................................... 3
2.1 Installing with the Fastboot Mode........................................................................................................ 3
3. Hardware Funcons ....................................................................................................................................... 5
3.1 Enabling ADB Debugging ...................................................................................................................... 5
3.2 Changing the Kernel Debug Level ......................................................................................................... 5
3.3 Checking the BSP Version...................................................................................................................... 5
3.4 DVFS...................................................................................................................................................... 6
3.5 Video playback...................................................................................................................................... 6
3.6 Audio Output and Recording ................................................................................................................ 6
3.7 Wi-Fi...................................................................................................................................................... 7
3.8 Bluetooth .............................................................................................................................................. 8
3.9 MTK NeuroPilot AI APU Hardware Acceleraon ................................................................................... 9

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VIA ARTiGO A935 Yocto 3.1 EVK Quick Start Guide
1. Introducon
This Quick Start Guide provides an overview of how to boot the Yocto image for the VIA ARTiGO A935 and
congure the supported hardware funcons in the build.
The VIA ARTiGO A935 Yocto 3.1 EVK is developed based on the MediaTek Yocto 3.1 BSP, and it enables the
hardware features of the VIA ARTiGO A935.
1.1 EVK Package Contents
There are three folders in the package listed as below.
Firmware folder Descripon
VIA_ARTiGO_A935_Yocto_3.1_EVK.zip Yocto evaluaon image
Document folder Descripon
VIA_ARTiGO_A935_Yocto_3.1_EVK_Quick_Start_Guide.pdf Quick Start Guide
Tool folder Descripon
VIA_Android_USB_Driver.zip VIA USB driver
np3.0.tgz A sample test program
1.1.1 Firmware Folder Contents
VIA_ARTiGO_A935_Yocto_3.1_EVK.zip: Contains the precompiled Yocto image for evaluang the VIA ARTiGO
A935.
1.1.2 Document Folder Contents
VIA_ARTiGO_A935_Yocto_3.1_EVK_Quick_Start_Guide.pdf: This Quick Start Guide provides an overview on
how to boot the Yocto image for the VIA ARTiGO A935 and congure the supported hardware funcons in the
build.
1.1.3 Tool Folder Contents
VIA_Android_USB_Driver.zip: The VIA driver for ADB-over-USB.
np3.0.tgz: A sample program to test MTK NeuroPilot AI APU hardware acceleraon..

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VIA ARTiGO A935 Yocto 3.1 EVK Quick Start Guide
1.2 Version Informaon and Supported Features
• Kernel version: 4.14.87
• Evaluaon image: Yocto 3.1
• Development based on MediaTek Yocto 3.1 BSP
• Supports eMMC boot
• Supports HDMI display
• Supports HDMI audio output
• Supports COM port as RS-232 mode (TX/RX)
• Supports 10/100Mbps Ethernet port
• Supports MediaTek MT6357 Line-out and Mic-in
• Supports MediaTek MT6631 Wi-Fi 802.11ac and Bluetooth 5.0
• Supports VIA EMIO-2573 (EC25) 4G LTE mobile broadband miniPCIe module
• Supports MediaTek NeuroPilot AI APU hardware acceleraon

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VIA ARTiGO A935 Yocto 3.1 EVK Quick Start Guide
2. Image Installaon
This secon explains the setup procedures for boong from the eMMC.
The precompiled images are provided in the "Firmware" folder.
2.1 Installing with the Fastboot Mode
Follow the steps below to install Yocto EVK image:
Step 1
Prepare the "fastboot tool" and install the "VIA USB driver" into your Windows 10 host machine.
To get the "fastboot tool" for Windows, please refer to the "SDK Plaorm Tools release notes" chapter on the
Android developer website hps://developer.android.com/studio/releases/plaorm-tools.
To install the "VIA USB driver", right-click "android_winusb" and select "Install".
Then click "Install" when the installer opens.
When the installer nishes, it will show a conrmaon message "The operaon completed successfully".
Step 2
Connect the Windows 10 host machine and the VIA ARTiGO A935 through the Micro USB 2.0 port using the
Micro USB cable.
Micro USB 2.0 OTG
Micro USB 2.0 port diagram

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VIA ARTiGO A935 Yocto 3.1 EVK Quick Start Guide
Step 3
Plug in the AC-to-DC power adapter to power on the VIA ARTiGO A935.
If the EVK image is not installed, the VIA ARTiGO A935 will stop at "fastboot: processing commands" as shown
in the debug console below. Proceed to step 4 directly.
Fastboot Mode
If the EVK image is already installed, use the following command to enter the Fastboot Mode on your Windows
10 host machine.
D:\platform-tools>adb shell reboot bootloader
Note:
Make sure the Windows 10 host machine detects the VIA ARTiGO A935 as an ADB device.
Step 4
Extract the VIA_ARTiGO_A935_Yocto_3.1_EVK.zip les on your Windows 10 host machine.
To install the image, use the following command:
D:\VIA_ARTiGO_A935_Yocto_3.1_EVK>set PATH=D:\platform-tools;%PATH%
D:\VIA_ARTiGO_A935_Yocto_3.1_EVK>viaash.exe --yocto
VIA: Operating system is Yocto
VIA: erasing preloader partition
VIA: installing bl2.img
VIA: installing MBR_EMMC
VIA: installing tee.img
VIA: erasing tee_b partition
VIA: installing boot.img
VIA: erasing boot_b partition
VIA: installing system.img
VIA: erasing system_b partition
VIA: installing userdata.ext4
VIA: rebooting target system
D:\VIA_ARTiGO_A935_Yocto_3.1_EVK>
Step 5
Unplug the AC-to-DC power adapter to power o the VIA ARTiGO A935.
Step 6
Unplug the Micro USB cable, press the Power Buon for 2 seconds, then release it to power on the VIA ARTiGO
A935.
When the boot process has completed, you will see the Yocto 3.1 desktop.

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VIA ARTiGO A935 Yocto 3.1 EVK Quick Start Guide
3. Hardware Funcons
This secon explains how to enable and test the hardware funcons precompiled in the Yocto 3.1 EVK.
3.1 Enabling ADB Debugging
Follow the steps below to enable ADB debugging:
Step 1
Connect the Windows 10 host machine and the VIA ARTiGO A935 through the Micro USB 2.0 port using the
Micro USB cable.
Micro USB 2.0 OTG
Micro USB 2.0 port diagram
Step 2
Power on the VIA ARTiGO A935 to iniate the boot process.
Step 3
When the VIA ARTiGO A935 has completed boong, use the following command to open ADB debugging.
E:\platform-tools>adb shell
3.2 Changing the Kernel Debug Level
To disable the kernel messages, modify the debug level using the following command:
root@aiv8365m1v1-aiot-emmc:~# echo 3 > /proc/sys/kernel/printk
3.3 Checking the BSP Version
To check the BSP version, use the following command:
root@aiv8365m1v1-aiot-emmc:~# cat /proc/version

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VIA ARTiGO A935 Yocto 3.1 EVK Quick Start Guide
3.4 DVFS
To verify the DVFS (Dynamic Voltage Frequency Scaling) funcon and list all the supported features, use the
following commands:
root@aiv8365m1v1-aiot-emmc:~# ls -al /sys/devices/system/cpu/cpu0/cpufreq/
total 0
drwxr-xr-x 4 root root 0 Aug 26 11:15 .
drwxr-xr-x 3 root root 0 Aug 26 11:15 ..
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 affected_cpus
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 cpuinfo_cur_freq
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 cpuinfo_max_freq
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 cpuinfo_min_freq
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 cpuinfo_transition_latency
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 related_cpus
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 scaling_available_frequencies
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 scaling_available_governors
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 scaling_cur_freq
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 scaling_driver
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 scaling_governor
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 scaling_max_freq
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 scaling_min_freq
-rwxr-xr-x 1 root root 4096 Aug 26 11:15 scaling_setspeed
drwxr-xr-x 2 root root 0 Aug 26 11:15 schedutil
drwxr-xr-x 2 root root 0 Aug 26 11:15 stats
To check the supported and current CPU frequency, use the following commands:
:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
850000 918000 987000 1056000 1125000 1216000 1308000 1400000 1466000 1533000 1633000 1700000
1767000 1834000 1917000 2001000
:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
1308000
3.5 Video playback
The VIA ARTiGO A935 supports H.265 and H.264 video decoding up to 1080p@60fps/40Mbps.
To playback video, use the following command:
root@aiv8365m1v1-aiot-emmc:~# gst-launch-1.0 -q playbin uri=le:/data/sda1/test.
mp4 ags=0x42 video-sink="mtkmdp width=640 height=480 ! video/x-raw,format=I420 !
mtkwaylandsink" audio-sink="autoaudiosink"
3.6 Audio Output and Recording
To set up the HDMI audio output, use the following command:
root@aiv8365m1v1-aiot-emmc:~# amixer -c0 cset name='O00 I05 Switch' 1
root@aiv8365m1v1-aiot-emmc:~# amixer -c0 cset name='O01 I06 Switch' 1
root@aiv8365m1v1-aiot-emmc:~# aplay /data/sda1/test.wav
To disable the HDMI audio output, use the following command:
root@aiv8365m1v1-aiot-emmc:~# amixer -c0 cset name='O00 I05 Switch' 0
root@aiv8365m1v1-aiot-emmc:~# amixer -c0 cset name='O01 I06 Switch' 0
To set up the headphone and the speaker audio output, use the following command:
root@aiv8365m1v1-aiot-emmc:~# amixer -c0 cset name='Audio_Amp_R_Switch' 1
root@aiv8365m1v1-aiot-emmc:~# amixer -c0 cset name='Audio_Amp_L_Switch' 1
root@aiv8365m1v1-aiot-emmc:~# aplay /data/sda1/test.wav