• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 99 subscribers
  • Views 315 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Query about Frame Buffer default Resolution

patel jignesh
Prodigy 140 points

Hi all,

In bootargs i have given frame buffer memory is 0:16M,1:8M,2:8M

I capture two 1080P60 resolution on HDMI port. if i use frame buffer memory /dev/fb0 and /dev/fb1 for both channel then it work fine 

But if i use frame buffer memory /dev/fb2 for any one channel then ioctl FBIOPUT_VSCREENINFO return unknown error.

Q-1:  Does it mean that /dev/fb2 frame buffer memory not support 1080P60 resolution ?. how i can capture 1080P60 resolution from /dev/fb2 ?

Q-2: I provide 16M memory to /dev/fb1 and for both channel. I use /dev/fb1 memory  then capture is successful but in both channel i get data of one channel. So any know why this happening ? 


Thanks in advance,

jignesh patel

 

  • 0
    TI__Mastermind 20245 points

    Hi,

    Answers inline,

    patel jignesh said:
    In bootargs i have given frame buffer memory is 0:16M,1:8M,2:8M

    Try 16M for each FB instead of 8 MB. 1920X1080. 1920X1080 for ARGB with dual buffering requires little above 15MB.

    patel jignesh said:
    Does it mean that /dev/fb2 frame buffer memory not support 1080P60 resolution ?. how i can capture 1080P60 resolution from /dev/fb2 ?

    By default /dev/fb2 is connected to SD display. SD display resolution is NTSC. So it wont allow to set buffer for 1920X1080. So please try to connect dev/fb2 to dvo2 or HDMI and then try what are you doing. You can refer to Video display user guide on how to route /dev/fb2 to DVO2 or HDMI.

    Regards,

    Hardik Shah

  • 0 in reply to HardikShah
    Prodigy 140 points

    Hi Hardik,

    Thanks for giving quick response.

    Now by connecting  /dev/fb2 to dvo2 I able to capture two video source successfully on TI8168 EVM.

    Thanks,

    Jignesh Patel

  • 0 in reply to patel jignesh
    TI__Mastermind 20245 points

    Hi,

    Thanks for confirming. Can you please mark thread as answered.

    Regards,

    Hardik

  • 0 in reply to HardikShah
    Intellectual 430 points

    I'm using frame buffer memory of 0:20M,1:20M,2:10M, and want to direct /dev/fb0 and /dev/fb1 to the HDMI at 1920x1080 and /dev/fb2 to the LCD at 800x480. I have the following so far:

    ./graphics0/nodes: 1:hdmi
    ./graphics1/nodes: 1:hdmi
    ./graphics2/nodes: 1:dvo2

    But I can't seem to change the mode, timings, output or any of the other settings for the /dev/fb2. It seems to stay stuck on SD. What additional setting do I have to set to make /dev/fb2 be directed to the LCD?

    ~Ashwin