[U-Boot] Displaying characters on the display in u-boot

[Bhargav A K]

Anatolij,

Thank you very very much, I will implement this very soon.
If I face any issues, which I won't after such excellent tutoring from you,
can I revert back to you ?

Thanks again :)...

> Yes. If board specific video initialization is done elsewhere the
> board_video_init() can be a dummy function.

I shall make it a dummy, and I have to make sure it return success,
as I have done it elsewhere.

Kind regards
Bhargav
________________________________________
From: Anatolij Gustschin [agust at denx.de]
Sent: Wednesday, March 27, 2013 9:57 PM
To: Bhargav A K
Cc: u-boot at lists.denx.de
Subject: Re: [U-Boot] Displaying characters on the display in u-boot

Hi,

On Wed, 27 Mar 2013 21:05:55 +0530
Bhargav A K <bhargav.ak at sasken.com> wrote:
...
> > What U-Boot version do you use?
>
> U-Boot 1.1.4-geb3fa991 (Feb 21 2013 - 10:11:04)
> (output of version command)

Very old, ;-).

> > 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 ?

yes, just provide a dummy video_set_lut(). If you do not use the
GDF__8BIT_INDEX framebuffer format, the rendering will work.

> 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 ?

Yes. If board specific video initialisation is done elsewhere the
board_video_init() can be a dummy function. Some video drivers
expect board_video_init() to return frame buffer base address but
i.e. in omap3 driver it returns 0 for successful video init or an
error code in case the board specific video init fails, thus
preventing further initialisation in the cfb_console driver.

Thanks,

Anatolij

SASKEN BUSINESS DISCLAIMER: This message may contain confidential, proprietary or legally privileged information. In case you are not the original intended Recipient of the message, you must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message and you are requested to delete it and inform the sender. Any views expressed in this message are those of the individual sender unless otherwise stated. Nothing contained in this message shall be construed as an offer or acceptance of any offer by Sasken Communication Technologies Limited ("Sasken") unless sent with that express intent and with due authority of Sasken. Sasken has taken enough precautions to prevent the spread of viruses. However the company accepts no liability for any damage caused by any virus transmitted by this email.
Read Disclaimer at http://www.sasken.com/extras/mail_disclaimer.html