4. Debug Message

4.1. U-Boot Parameters

There is default parameters file in the firmware installer:

$(SD card)/bspinst/bspinst.cfg

The bspinst.cfg file structure has four segments.

• Scenario: board model and boot method
• Common: general setting
• Target (board models): specific setting for each target
• Routine: parameters of boot method

4.2. U-Boot Environment

VAB-600 android platform can stop booting to enter u-boot environment. The u-boot will initiate hardware at earlier stage by those parameters.

Connect to the debug port using terminal application on PC site.

Figure 1: Debug connection

Figure 2: Springboard with RS232 debug cable

The serial connection settings:

Comm speed: 115200
Comm parity: None
Comm data: 8
Comm stopbits:1

4.2.1. Enter u-boot

The u-boot will wait 3 seconds to stop booting after power on by pressing any key. When booting is stopped, the prompt sign WMT # will be shown on terminal screen.

U-Boot is like a tiny operation system that has its own commands. Here it describes some important commands and parameters.

4.3. U-Boot Parameters Example

Print online help:

WMT # help

Change display mode and resolution:

• LVDS output:

  WMT # setenv wmt.display.param 2:0:24:800:480:60
  

• HDMI output

  WMT # setenv wmt.display.param 4:6:1:1280:720:60
  

• Save changed parameters:

  WMT # saveenv
  

4.4. Setup ADB

The ADB is the debug tool for Android application development.

• PC and VAB-600 must be in the same network domain

• Connect PC to VAB-600

  • PC site: $ ./adb tcp
  • PC site: $ ./adb connect [VAB-600 IP]

• Install application

  • PC site: $ ./adb install [name].apk

• Test Shell

  • PC site: $ ./adb shell ls
  • PC site: $ ./adb shell ls -l