VIA Technologies SOM-9X35-STK User manual

QUICK START GUIDE
VIA SOM-9X35-STK
Android 10.0 EVK
1.00-15032022

Copyright
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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/
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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
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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 SOM-9X35-STK Android 10.0 EVK Quick Start Guide
Revision History
Version Date Remarks
1.00 15/03/2022 Inial release

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VIA SOM-9X35-STK Android 10.0 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 Using the Debug Console...................................................................................................................... 5
3.2 Changing the Kernel Debug Level ......................................................................................................... 6
3.3 Checking the BSP Version...................................................................................................................... 6
3.4 DVFS...................................................................................................................................................... 7
3.5 Display................................................................................................................................................... 7
3.6 Camera.................................................................................................................................................. 7
3.7 MTK NeuroPilot AI APU Hardware Acceleraon................................................................................... 8

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VIA SOM-9X35-STK Android 10.0 EVK Quick Start Guide
1. Introducon
This Quick Start Guide provides an overview of how to boot the Android image for the VIA SOM-9X35-STK and
congure the supported hardware funcons in the build.
Note:
The VIA SOM-9X35-STK includes the VIA SOM-9X35 module and the VIA VAB-935 reference carrier board.
The VIA SOM-9X35-STK Android 10.0 EVK is developed based on the MediaTek Android 10.0 BSP, and it enables
the hardware features of the VIA SOM-9X35-STK.
1.1 EVK Package Contents
There are three folders in the package listed as below.
Firmware folder Descripon
VIA_SOM-9X35-STK_Android_10.0_EVK.zip Android image
Document folder Descripon
VIA_SOM-9X35-STK_Android_10.0_EVK_Quick_Start_Guide.pdf Quick Start Guide
Tool folder Descripon
VIA_Android_USB_Driver.zip VIA USB driver
1.1.1 Firmware Folder Contents
VIA_SOM-9X35-STK_Android_10.0_EVK.zip: Contains the precompiled Android image for evaluang the VIA
SOM-9X35-STK.
1.1.2 Document Folder Contents
VIA_SOM-9X35-STK_Android_10.0_EVK_Quick_Start_Guide.pdf: This Quick Start Guide provides an overview
on how to boot the Android image for the VIA SOM-9X35-STK and congure the supported hardware funcons
in the build.
1.1.3 Tool Folder Contents
VIA_Android_USB_Driver.zip: VIA USB driver.

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VIA SOM-9X35-STK Android 10.0 EVK Quick Start Guide
1.2 Version Informaon and Supported Features
• Kernel version: 4.14.141
• Evaluaon image: Android 10.0
• Development based on MediaTek Android 10.0 BSP
• Supports eMMC boot
• Supports HDMI display
• Supports HDMI audio output
• Supports MIPI DSI capacive touch panel
−ShenZhen K&D 7" KD070D54-39NH-B018-A (1024x600)
−Silead GSL1680 I2C touch
• 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 MIPI CSI IMX135 camera module
• Supports MediaTek NeuroPilot AI APU hardware acceleraon

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VIA SOM-9X35-STK Android 10.0 EVK Quick Start Guide
2. Image Installaon
This secon explains the setup requirements for boong from the eMMC.
The precompiled images are provided in the "Firmware" folder.
2.1 Installing with the Fastboot Mode
The rst step is to 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 on the mouse buon to install the "android_winusb". When nished,
it will show "The operaon completed successfully".
Then connect the Windows 10 host machine and the VIA SOM-9X35-STK through the Micro USB 2.0 port using
the Micro USB cable.
Micro USB
Micro USB 2.0 port diagram
Plug in the AC-to-DC power adapter to power on the VIA SOM-9X35-STK.
The VIA SOM-9X35-STK will stop at "fastboot: processing commands" as shown in the debug console below.
Fastboot Mode
Note:
Make sure the Windows 10 host machine detects the VIA SOM-9X35-STK as an Android device.
Extract the VIA_VAB-935-STK_Android_10.0_EVK.zip les on your Windows 10 host machine.
To install the image, use the following command:
D:\VIA_SOM-9X35-STK_Android_10.0_EVK>set PATH=D:\platform-tools;%PATH%
D:\VIA_SOM-9X35-STK_Android_10.0_EVK>viaash.exe --android
VIA: Operating system is Android
VIA: installing preloader.img
VIA: installing GPT.img
VIA: erasing proinfo partition
VIA: erasing boot_para partition
VIA: installing cam_vpu1.img
VIA: installing cam_vpu2.img
VIA: installing cam_vpu3.img
VIA: erasing nvram partition
VIA: installing protect1.img
VIA: installing protect2.img
VIA: installing persist.img
VIA: installing nvcfg.img
VIA: erasing seccfg partition

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VIA SOM-9X35-STK Android 10.0 EVK Quick Start Guide
VIA: installing lk.img
VIA: installing lk.img
VIA: installing boot.img
VIA: installing recovery.img
VIA: erasing para partition
VIA: installing logo.bin
VIA: installing dtbo.img
VIA: erasing expdb partition
VIA: erasing frp partition
VIA: installing tee.img
VIA: installing tee.img
VIA: erasing kb partition
VIA: erasing dkb partition
VIA: erasing metadata partition
VIA: installing vbmeta.img
VIA: installing nvdata.img
VIA: installing vbmeta_system.img
VIA: installing vbmeta_vendor.img
VIA: installing super.img
VIA: installing cache.img
VIA: installing userdata.img
VIA: rebooting target system
D:\VIA_SOM-9X35-STK_Android_10.0_EVK>
If you have already installed the image, use the following command to enter the Fastboot Mode on your
Windows 10 host machine.
D:\platform-tools>adb reboot bootloader
Unplug the AC-to-DC power adapter to power o the VIA SOM-9X35-STK.
Unplug the Micro USB cable, press the Power Buon for 2 seconds, then release it to power on the VIA SOM-
9X35-STK.
When the boot process has completed, you will see the Android 10.0 desktop.

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VIA SOM-9X35-STK Android 10.0 EVK Quick Start Guide
3. Hardware Funcons
This secon explains how to enable and test the hardware funcons precompiled in the Android 10.0 EVK
including using the debug console.
3.1 Using the Debug Console
Insert one plug connector of the 4-pin FFC cable into the J3 port labeled "UART0" on the VIA SOM-9X35
module, ensuring that the gold nger of the FFC cable faces down.
UART0 Port
Insert the other plug connector of the 4-pin FFC cable into the 4-pin FFC port located on the USB to UART
debug board, ensuring that the gold nger of the FFC cable faces down.

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VIA SOM-9X35-STK Android 10.0 EVK Quick Start Guide
FCC Port
Connect the Windows 10 host machine through the Micro USB 2.0 port on the USB to UART debug board using
the Micro USB cable.
Use a serial port communicaon program such as PuTTY or Tera Term to connect the debug console. Set the
console Baud Rate to "921600".
Next, power on the VIA SOM-9X35-STK to iniate the boot process.
When the boot process has completed, log in to the debug console.
3.2 Changing the Kernel Debug Level
To disable the kernel messages, modify the debug level using the following command:
console:/ # su
console:/ # echo 3 > /proc/sys/kernel/printk
3.3 Checking the BSP Version
To check the BSP version, use the following command:
console:/ # cat /proc/version

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VIA SOM-9X35-STK Android 10.0 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:
console:/ # ls -l /sys/devices/system/cpu/cpu0/cpufreq/
total 0
-r--r--r-- 1 root root 4096 2022-02-24 18:16 aected_cpus
-r-------- 1 root root 4096 2022-02-24 18:16 cpuinfo_cur_freq
-r--r--r-- 1 root root 4096 2022-02-24 18:16 cpuinfo_max_freq
-r--r--r-- 1 root root 4096 2022-02-24 18:16 cpuinfo_min_freq
-r--r--r-- 1 root root 4096 2022-02-24 18:16 cpuinfo_transition_latency
-r--r--r-- 1 root root 4096 2022-02-24 18:16 related_cpus
-r--r--r-- 1 root root 4096 2000-01-01 00:00 scaling_available_frequencies
-r--r--r-- 1 root root 4096 2022-02-24 18:16 scaling_available_governors
-r--r--r-- 1 root root 4096 2022-02-24 18:16 scaling_cur_freq
-r--r--r-- 1 root root 4096 2022-02-24 18:16 scaling_driver
-rw-r--r-- 1 root root 4096 2022-02-23 15:46 scaling_governor
-rw-rw---- 1 system system 4096 2000-01-01 00:00 scaling_max_freq
-rw-rw-r-- 1 system system 4096 2000-01-01 00:00 scaling_min_freq
-rw-r--r-- 1 root root 4096 2022-02-24 18:16 scaling_setspeed
drwxr-xr-x 2 root root 0 2022-02-24 18:16 schedutil
drwxr-xr-x 2 root root 0 2000-01-01 00:00 stats
console:/ #
To check the supported and current CPU frequency, use the following commands:
console:/ # 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
console:/ # cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
1400000
3.5 Display
There is no need to set the display device. If you connect an HDMI display, HDMI output will be automacally
enabled aer boong. If you connect an LCD panel, LCD panel output will be automacally enabled aer
boong.
3.6 Camera
You must connect the CSI camera before boong the VIA SOM-9X35-STK aer the image installaon.
Click the "Camera" APK on the Android desktop to verify the camera funcon.
If the CSI camera is connected correctly, but there is no "Camera" APK on the Android desktop, go to "Sengs
-> System -> Advanced -> Reset opons" and press "Erase all data (factory reset)" to restart the system.
The “Camera” APK will be generated aer the system is rebooted.

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VIA SOM-9X35-STK Android 10.0 EVK Quick Start Guide
3.7 MTK NeuroPilot AI APU Hardware Acceleraon
We recommend that you install the MTK sample APK "PoseDetector-0.2-debug.apk" for vericaon.
Run the MTK sample APK "PoseDetector-0.2-debug.apk".
To check that the NeuroPilot AI APU hardware acceleraon is enabled, make sure the Inference Time is less
than 220ms.
Note:
When the Inference Time is greater than 400ms indicates that the APU hardware acceleraon is disabled.

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