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debug.rst

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Debug Message

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

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.

Debug connection schematic

Debug connection

Springboard with RS232 debug cable

Springboard with RS232 debug cable

The serial connection settings:

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

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

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