Change boot logo
From Gumstix User Wiki
custom logo by the following method:
The gumstix-fb-logo.patch is a diff between a custom image and the default Penguin 'logo_linux_clut224.ppm'.
This image can be found in (for a Verdex):
You'll need the original image, so you can perform the following steps to get a pre-patched kernel:
bitbake -c clean gumstix-kernel
bitbake -c unpack gumstix-kernel
After you implement your patch, do:
to finish the build.
You can then copy uImage over, and hopefully have a pretty, custom logo.
If the compile fails, it's likely due to a problem with your PPM. In Gimp, you need to set the palette to 224 colors and make sure you save it as ascii.
A more detailed description:
Custom Boot Logo/Image for Verdex
To implement a custom image or logo that will show when the Verdex is booting up, you need to create a patch using diff.
The patch is a diff between the default linux Penguin logo and the new image you want to display. The default linux Penguin logo is found in the following directory:
It's file name is: logo_linux_clut224.ppm
First steps are to start off with a clean gumstix-kernel, so do the following:
bitbake -c clean gumstix-kernel bitbake -c unpack gumstix-kernel
Now, 5 steps to create the patch using diff. Do the following:
0. Make sure the logo_linux_clut224.ppm and your new image are in the same directory (or type the full path to each)
1. Use the diff tool:
diff -c logo_linux_clut224.ppm new_image_logo.ppm > my-logo.patch
2. Open the newly created my-logo.patch in a text editor, and add the following 2 lines at the head of the file
Index: linux-2.6.21gum/drivers/video/logo/logo_linux_clut224.ppm ===================================================================
3. Save the my-logo.patch with those two lines added
4. Copy the my-logo.patch to the following directories, and update the name of the patch:
cp my-logo.patch .../gumstix-oe/com.gumstix.collection/packages/linux/gumstix-kernel-2.6.21/gumstix-fb-logo.patch cp my-logo.patch .../gumstix-oe/org.openembedded.snapshot/packages/linux/linux-2.6.21/gumstix-fb-logo.patch
Now that you have your patch in the correct directories, rebuild the kernel:
Finally, copy the kernel to your verdex using the steps given in this link: http://gumstix.org/software-development/yocto-project/190-verdex-svn-repository.html 
It isn't necessary to reload the filesystem, so you can skip down to the end where you just copy over the kernel.
A few notes:
- Using diff doesn't produce the two header lines. The bitbake will fail without those two lines.
- I've only tried this with image sizes 480 px wide and less than or equal 216 px high
- Make sure to save your new logo using GIMP as a .ppm ASCII file, with the Image > Mode > Indexed set for Maximum number of colors as 224