LVDS Interface

  • Dear Support

    I have this ArmstoneA9 board, not starterkit, no micro SD card.

    I connect Monitor via HDMI and a 7" display via the lvds interface, but I only see 4 penuins Logo on the 7" Display, on the monitor is OK

    Is there any way to "activate" LVDS ,

    Tried "xrandr", but it doesn't work.


  • Thanks for your feedback
    How to add "video" atribute to "bootargs" variable on uBoot?
    I am not sure if I did it right
    I powered the board and login with "root"
    then try the command " setenv bootargs console=ttymxc1,video=mxcfb1:dev=lcd,CLAA-WVGA,if=RGB666 "
    then i got "-sh: setenv: not found"
    Do I have to use a terminal program(Putty) to send the command to board?

  • You should add that variable into uboot.

    1) Connect PC & ARMStone with serial console.
    2) Open a PC serial terminal (Teraterm for example) -> Configure it to open a connection with ARMStone using serial communicacion
    3) Run ARMStone
    4) Stop the linux kernel boot pressing a key. The uBoot prompt appears.
    5) Add your bootargs.

    LVSD Interface with sc card boot:
    fec_mac=00:05:51:08:18:D2 root=/dev/mmcblk0p1 rootfstype=ext4 rootwait rw video=mxcfb0:dev=lcd,LCD-ET070080,if=RGB666 console=ttymxc1,115200

    fec_mac=00:05:51:08:18:D2 - Device mac (i think is optional)
    root=/dev/mmcblk0p1 rootfstype=ext4 rootwait rw - Boot mode (see quick start document)
    video=mxcfb0:dev=lcd,LCD-ET070080,if=RGB666 - Video output mode
    console=ttymxc1,115200 - Serial debug output console

    * You can see the uBoot commands with "help"
    * You can print all variables with "printenv"