DSS2 Setup

TJ_Onlinegeek · April 1, 2012, 2:33am

I am trying to configure DSS2 to output to both a LCD touchscreen at 800x480 and output to the S-video port at the maximum resolution. I also want to configure this so that these are not clones of each other but I am having trouble understanding the configuration documentation. Does anyone know how this can be done?
Thanks

-TJ

TJ_Onlinegeek · April 1, 2012, 4:45am

I actually think my real hold back is being able to define multiple frame buffers. I can change between my outputs and such but I can’t seem to define multiple buffers any advice?
-TJ

TJ_Onlinegeek · April 1, 2012, 4:42pm

More specifically I am trying omapfb.vram=0:4M,1:4M only one frame buffer ends up being defined with a size and address in /sys/class/graphics/fb?. Any Idea why this would be?
-TJ

Hiremath_Vaibhav · April 3, 2012, 6:04am

More specifically I am trying omapfb.vram=0:4M,1:4M only one frame
buffer ends up being defined with a size and address in
/sys/class/graphics/fb?. Any Idea why this would be?

Do you have fb0, fb1 available? Something like,

/sys/class/graphics/fb0/
/sys/class/graphics/fb1/

I guess not.

If it is the case, the problem could be option "CONFIG_FB_OMAP2_NUM_FBS",
Make sure that it is configured to >1.

Also, share your bootlog, driver may have thrown some errors.

Thanks,
Vaibhav

TJ_Onlinegeek · April 3, 2012, 1:58pm

Both of those paths exist within the operating system, but fb1 the size field is 0 and i and most of the other fields inside are empty as well. What bootlog exactly do you mean? The ubuntu or serial boot? Also the CONFIG_FB_OMAP2_NUM_FBS param where is that toggled?
Thanks for responding btw.
TJ

Hiremath_Vaibhav · April 3, 2012, 2:24pm

Yes, I was referring to serial boot log.

Also, are you passing vram bootargs (vram="8M")?

Thanks,
Vaibhav

TJ_Onlinegeek · April 3, 2012, 2:30pm

Yea I can send you my uEnv.txt file if you would like

TJ_Onlinegeek · April 13, 2012, 8:40pm

What were you speaking of while you were mentioning CONFIG_FB_OMAP2_NUM_FBS

Hiremath_Vaibhav · April 16, 2012, 6:41am

FB_OMAP2_NUM_FBS controls the number of framebuffers required,

FB_OMAP2_NUM_FBS=1
/dev/fb0 -> gfx plane
/dev/videoX -> Video1 plane
/dev/videoX -> Video2 plane

FB_OMAP2_NUM_FBS=2
/dev/fb0 -> gfx plane
/dev/fb1 -> Video1 plane
/dev/videoX -> Video2 plane

FB_OMAP2_NUM_FBS=3
/dev/fb0 -> gfx plane
/dev/fb1 -> Video1 plane
/dev/fb2 -> Video2 plane

Thanks,
Vaibhav

TJ_Onlinegeek · April 16, 2012, 6:41pm

How do you set that configuration tho?

Hiremath_Vaibhav · April 16, 2012, 7:20pm

It is compile time configuration option, either through menuconfig (in FB driver) OR change directly .config.

Thanks,
Vaibhav

TJ_Onlinegeek · April 16, 2012, 8:16pm

Do you have any documentation describing this? Because I honestly haven’t seen a reference to anything that I have seen

Hiremath_Vaibhav · April 17, 2012, 6:37am

You can refer to PSP user guide for this (created during PSP release based on 2.6.37 kernel)
http://processors.wiki.ti.com/index.php/AM35x-OMAP35x-PSP_04.02.00.07_UserGuide#Video_Display_Driver

Thanks,
Vaibhav

TJ_Onlinegeek · April 17, 2012, 11:30pm

So with my beagleboard I have tried doing vram=20M omapfb.vram=0:20M to define the size of frame buffers, and I have tried vram=20M omapfb.vram=0:14M,0:6M for multiple buffers with no success. The documentation states that this should create two frame buffers? Any idea where this should be. I shouldn’t have to build a special kernel to do this should I? I should be able to use the kernel described here http://elinux.org/BeagleBoardUbuntu#Method_1:_Download_a_Complete_Pre-Configured_Image? Thanks for your help
-TJ

Hiremath_Vaibhav · April 18, 2012, 6:12am

You miss-understood this, in order to create multiple fbs you must pass "vram=12M omapfb.vram=0:4M,1:4M,2:4M", assuming that you have FB_OMAP2_NUM_FBS=3.

By default everything will be put on LCD output (as this is default output). In order to get TV (S-Video) output you have to put /dev/fb1 (video1 plane) to TV out. Something like,

# echo 0 > /sys/devices/platform/omapdss/overlay/enabled
# echo "tv" > /sys/devices/platform/omapdss/overlay1/manager
# echo 1 > /sys/devices/platform/omapdss/overlay/enabled
# echo 1 > /sys/devices/platform/omapdss/display1/enabled

NOTE: These steps what I remember on top of my head, I have not tried these steps while writing this email.
But this should give you a logic and idea about what I am trying to convey here.

Thanks,
Vaibhav

Vladimir_Pantelic · April 18, 2012, 7:01am

Hiremath, Vaibhav wrote:

You miss-understood this, in order to create multiple fbs you must pass ï¿½vram=12M omapfb.vram=0:4M,1:4M,2:4Mï¿½, assuming
that you have FB_OMAP2_NUM_FBS=3.

By default everything will be put on LCD output (as this is default output). In order to get TV (S-Video) output you
have to put /dev/fb1 (video1 plane) to TV out. Something like,

# echo 0 > /sys/devices/platform/omapdss/overlay/enabled

# echo ï¿½tvï¿½ > /sys/devices/platform/omapdss/overlay1/manager

# echo 1 > /sys/devices/platform/omapdss/overlay/enabled

# echo 1 > /sys/devices/platform/omapdss/display1/enabled

NOTE: These steps what I remember on top of my head, I have not tried these steps while writing this email.

But this should give you a logic and idea about what I am trying to convey here.

maybe to make it more clear:

you need to recompile the Linux kernel with FB_OMAP2_NUM_FBS=3 and then
use this kernel with the above command line setting.