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Desire quick SPLASH screen for DM6467T EVM powerup.

Helmut Forren
Mastermind 6805 points
Other Parts Discussed in Thread: THS8200

In preparation for my own custom hardware, I have the DM6467T EVM booting up from either it's hard disk or NAND memory and then automatically starting my codec-using application.  In *both* cases, bootup is pretty slow, and then loading up the codec engine is pretty slow as well.  (I'm not yet talking about trying to speed up NAND access.)  

Right now, the display screen is blank/off for perhaps a minute, during which time a would be user might wonder if the device is broken.

I would like to have almost any kind of video display output occur, as soon as possible after the power is turned on.  In the worst case, this could be a mono-color screen thrown up (less than a second) after power up.  In the best case, this would be some fixed splash image of mine that gets displayed.  Actually, assuming the mono-color screen could be done quicker than the splash image, the best would be BOTH in succession.

Does anyone have advice on how to do this?  Your input is greatly appreciated.  This includes advice on links, how to display the thing, and also where to put invocation (rc0.d? I know very little about rc#.d stuff)

Note one thing occurs to me, to modify the display chip driver source code to put the chip into some kind of mono-color output mode, if such exists.  Or else put a small program near the driver load to do this. 

Thanks very much,

Helmut

  • 0
    TI__Prodigy 650 points

    The VPIF is connected to the video encoder  - either ADV7343 through the daughter card or THS8200.

    One can get some display by generating the color bars/test patterns which are programmable on the encoder  chips:

    ADV7343:

    NTSC:
    0x00 - 0xFC
    0x82 - 0xC9
    0x84 - 0x40

    0x02: 0x24

     

    For THS8200 it is a little more tricky. The datasheet says that the test pattern is only available for VESA modes. If you are doing it for VESA modes you have the settings in the datasheet. Otherwise, the way is to program the VPIF and THS and the other CPLDs just the way the driver does into the uboot.