Hi All,
I have enabled the following configurations.
in my board's config header
#define CONFIG_VGA_AS_SINGLE_DEVICE
#define CONFIG_VIDEO
#define CONFIG_CFB_CONSOLE
video_hw_init() returns a pointer to GraphicsDevice structure.
It does the following
-----------------------------------------------------
omap4_GD.winSizeX = 480; //__raw_readl()
omap4_GD.winSizeY = 800;
omap4_GD.gdfBytesPP = 4;
omap4_GD.gdfIndex = GDF_32BIT_X888RGB;
__raw_writel(0xA5000000, DISPC_GFX_BA0);
omap4_GD.frameAdrs = __raw_readl(DISPC_GFX_BA0);
initDisplay(); // Do all other clocks, GPIOs, OMAP4 registers specific for
LCD(DSI, DISPC, DSS).
------------------------------------------------------
board_video_init() is just a dummy call.
I did a console_assign() to redirect stderr and stdout to vga.
All the printf's doesn't come on the serial console or the LCD.
I tried using the video_drawstring(10, 20, "hello world"),
after resetting the stdout to serial. I see all the "printf's" on the
serial console, but the string from video_drawstring()(hello world)
won't come on the LCD even after syncing LCD pipelines (GO_LCD in OMAP4470).
Then I just exported the lcd_drawchars() function into my LCD code,
tried to write characters to the LCD, nothing came onto the screen.
Please point out where I am going wrong.
Kind regards
Bhargav
________________________________________
From: Bhargav A K
Sent: Wednesday, March 27, 2013 10:04 PM
To: Anatolij Gustschin
Cc: u-boot@lists.denx.de
Subject: RE: [U-Boot] Displaying characters on the display in u-boot
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 [ag...@denx.de]
Sent: Wednesday, March 27, 2013 9:57 PM
To: Bhargav A K
Cc: u-boot@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...@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
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
