How to change uboot splash image
1- Get image that you want to show in resolution smaller than your display resolution.
2- Open the image using GIMP graphic application.
3- Save the image using "save as" option.
4- In the select box "Select File Type (by Extension)" select the format "c source code"
5- Then you will get one windows with some options, in this window deselect all options (Use glibs types, use macros instead of struct, Use 1 byte run-length-encoding, Save alpha channel)
6- Then save this file (changing the file extension from .c to .h) to
$DEVDIR/bootloader/uboot.*/src/board/davinci/common
7- Change the variable value CONFIG_SPLASH_LOGO_FILE with the name of file used above. The CONFIG_SPLASH_LOGO_FILE configuration setting can be found in the Splash Screen section in your board file in the directory
$DEVDIR/bootloader/uboot.*/src/include/configs
8- Clean and compile the bootloader
The form of the image-file must be similar to:
/* GIMP RGB C-Source image dump (image.c) */ static const struct { unsigned int width; unsigned int height; unsigned int bytes_per_pixel; /* 3:RGB, 4:RGBA */ unsigned char pixel_data[200 * 100 * 3 + 1]; } gimp_image = { 200, 100, 3, "(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306" "(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306" "(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306" "(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306(\237\306"
Remember that normally the bootloader modifications are made using patches.