Hello,
first of all, please reduce the size of lines in your emails to this list to max. 80 characters per line. TIA!
lzhmail wrote:
Hi, I want to display a starting logo on LCD when my custome board power up, so what shoud I do to achieve this purpose? The U-Boot version is 1.1.1, the processor is AT91RM9200, and the display controller is SAMSUNG S1D13506. should I implement framebuffer driver for the display controller?
Currently there is no support for S1D13506 in U-Boot code, whether in version 1.1.1, nor in the current U-Boot git tree. So, you have to implement simple frame buffer driver for Epson S1D13506. Take a look at other available drivers in 'drivers/sed13806.c' or 'drivers/ct69000.c' for version 1.1.1 or at drivers in 'drivers/video/' in the current version. You have to implement S1D13506-specific video_hw_init() and video_set_lut() at least.
Then download Epson S1D13506 data sheet and get FPM/EDO-DRAM data sheet of the DRAM in question. Read them to acquire knowledge how to initialize S1D13506 and how to program S1D13506 memory controller to be able to access to the video RAM. Program the initialization sequence and ensure that the video RAM access works properly. Also get the data sheet of your LCD panel and read the info about panel clock and timings, then program the S1D13506 display controller accordingly. All these init steps are usually done in video_hw_init(). You also probably need to implement backlight/display brightness control.
Or Just simply add "SPLASH SCREEN" support according to instruction of the U-Boot document "README".
In README it is assumed that a working frame buffer driver is already there. The CONFIG_SPLASH_SCREEN option only enables the possibility to display a BMP image instead of the logo, copyright and system information on the LCD.
You also have to add CONFIG_VIDEO, CONFIG_CFB_CONSOLE, CONFIG_VIDEO_SW_CURSOR etc. to the board configuration. It is preferred to use latest U-Boot code, so please use it, add your S1D13506 driver and then consider to post S1D13506 patches to the list, :-).
Best regards,
Anatolij