Hardware Functions; Using The Debug Console; Changing The Kernel Debug Level; Checking The Bsp Version - VIA Technologies VAB-950 Quick Start Manual

VIA VAB-950 Android 10.0 EVK Quick Start Guide

3. Hardware Functions

This section explains how to enable and test the hardware functions precompiled in the Android 10.0 EVK
including using the debug console.

3.1 Using the Debug Console

The first step is to connect the host machine and the VIA VAB-950 through the COM connector labeled as
"COM". Use a serial port communication program such as PuTTY or Tera Term to connect the debug console.
Set the console Baud Rate to "921600".
COM connector diagram
Next, power on the VIA VAB-950 to initiate the boot process.
When the boot process is completed, you will 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

3.4 DVFS

To verify the DVFS (Dynamic Voltage Frequency Scaling) function 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 2020-04-06 06:34 affected_cpus
-r-------- 1 root root 4096 2020-04-06 06:34 cpuinfo_cur_freq
-r--r--r-- 1 root root 4096 2020-04-06 06:34 cpuinfo_max_freq
-r--r--r-- 1 root root 4096 2020-04-06 06:34 cpuinfo_min_freq
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