About Framebuffer on dm365

amit pandya

Hi all,

I am able to support ( Display ) HD 720P ( 1280x720 ) using OSD0 on DM365.But when I try to Display HD 1080I ( 1920x1080) using OSD0,I can not get the right display for 1920x1080 resolution.Is their any limit for the height of the frame buffer supported on DM365?

I try Displaying 1080I (1920x1080) image using video window 0 also,as the VPBE manual suggests using video window 0 for HD and to have video window 1 turned off when displaying HD ,but it is also giving the same result.

In my case driver are initialized during boot-up according to u-boot 'bootargs' settings as follows for the 1080I display,

1) For OSD0 window

bootargs console=ttyS0,115200n8 noinitrd rw ip=10.60.5.135:10.60.5.127:10.60.5.1:255.255.255.0 root=/dev/nfs nfsroot=10.60.5.127:/home/Harris/workdir /filesys,nolock mem=70M video=davincifb:vid0=OFF:vid1=OFF:osd0=1920x1080x16,8100K dm365_imp.oper_mode=1

2) for video window 0

bootargs console=ttyS0,115200n8 noinitrd rw ip=10.60.5.135:10.60.5.127:10.60.5.1:255.255.255.0 root=/dev/nfs nfsroot=10.60.5.127:/home/Harris/workdir/filesys,nolock mem=70M video=davincifb:vid0=1920x1080x16,8100K@0,0:vid1=OFF:osd0=720x576x16,5400K@0,0 dm365_imp.oper_mode=1

Please give me some help on this problem.

Thanks.

over 15 years ago

0 AnantGole over 15 years ago

TI__Prodigy 570 points

Can you let us know which release are you using? If you are using 3.01 Beta (r31) then do check if the known issue / workaround listed in release notes works for you.

0 MDK35233 over 15 years ago

TI__Prodigy 720 points

Your frame buffer size appears to be incorrect. The calculation is as follows:-

For VID0 and VID1, you need to use triple buffering. OSD0 uses double buffering.

For each use the formula:

framBufferSize in Kbytes = width * height * bpp * numBuffers

For double buffering with bpp = 2 (2 bytes per pixel), this translates to

1920 * 1080 * 2 * 3 for VID0 & VID1

1920 * 1080 * 2 * 2 for OSD0

0 amit pandya over 15 years ago in reply to AnantGole

Prodigy 230 points

Hi AnantGole

I am using the dvsdk_2_10_01_18 for DM365 & not the Beta 3.10...

Is their any known issue with this version for Dispaly HD 1080I.

Thanks

0 amit pandya over 15 years ago in reply to MDK35233

Prodigy 230 points

Hi MDK

I have already tried with following bootargs for VID0

" vid0=1920x1080x16,12M@0,0 "

But still the problem remains the same...

Thanks.

0 BK Lee over 15 years ago in reply to amit pandya

Prodigy 35 points

hi,

Maybe playing HD on /dev/fb is not a proper way ,i guess using video2 is better.

0 ThomasKloiber over 14 years ago in reply to amit pandya

Prodigy 40 points

Hi Amit,

it seems, I have the same issue. I'm working with DM6446 and LSP 2.0.0.22.

I also want to use OSD0 fb in 1920x1080 resolution. But I'm not able to use more than 960 lines even if my bootargs are "....osd0=1920x1080x16......".

The maximum mode I can use is 1920 x 960.

Did you find a solution for this issue in the meantime?

Thanks and best regards,

Thomas

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About Framebuffer on dm365