Hi Anatolij
Thank you very much for Ur guidance
What U-Boot version do you use?
U-Boot 1.1.4-geb3fa991 (Feb 21 2013 - 10:11:04) (output of version command)
This video_set_lut() function is only needed if you use 8 bits per pixel frame buffer.
So can I comment it out, (or) just make a dummy call and dummy return from it. It wont affect my character(text) rendering on the display, correct ?
My last question, the board_video_init() function just initializes the board in display/video mode. For example if I have a GPIO to switch b/w command and video modes and a GPIO to switch on the LCD, etc., I'll have to do all such functions in it.
But if all of those are already done, I can just return a dummy from the function ?
Kind regards Bhargav ________________________________________ From: Anatolij Gustschin [agust@denx.de] Sent: Wednesday, March 27, 2013 8:30 PM To: Bhargav A K Cc: u-boot@lists.denx.de Subject: Re: [U-Boot] Displaying characters on the display in u-boot
Hi,
please keep the U-Boot list address on Cc, other users may find the discussion helpful.
On Wed, 27 Mar 2013 19:40:33 +0530 Bhargav A K bhargav.ak@sasken.com wrote: ...
Now I will have to define video_set_lut() also, isn't it ?
It depends. What U-Boot version do you use? If you use mainline U-Boot recent versions like v2013.01.01, then this function already exists as a week default empty function. You do not always need video_set_lut() functionality unless you want to use a frame buffer configuration with 8 bits per pixel colour depth.
Can I please get more information on what I have to handle inside the function ?
This video_set_lut() function is only needed if you use 8 bits per pixel frame buffer. I doubt that you want to use it since the splash screen quality will be really bad in this color depth mode. If you want to use this depth, then this function should fill the color palette (look up table) of the display controller using the index argument of the function as an index into look-up table and using other arguments as values for the look-up table entries under that index.
Also, Is there any place where I can of getting more information on the structure members of "struct GraphicDevice" ?
the needed struct members are more or less self-explanatory, so these are not documented anywhere, I think. You need to init only:
winSizeX - the width of the display in pixels winSizeY - the height of the display in pixels gdfBytesPP - frame buffer color depth in bytes per pixel gdfIndex - graphics data format of the frame buffer, it is one of GDF__8BIT_INDEX GDF_15BIT_555RGB GDF_16BIT_565RGB GDF_32BIT_X888RGB GDF_24BIT_888RGB GDF__8BIT_332RGB
frameAdrs - the starting frame buffer address in the video ram
You do not need to initialise other members.
Thanks,
Anatolij
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