Linux kernel 2.6.X, a method that repace of the default logo in Ubuntu 10.04
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1. Install PNG photo tools
#apt-get install netpbm
2. Process PNG file
#pngtopnm logo_01.png > logo_01.pnm
#pnmquant 224 logo_01.pnm > logo_01_224.pnm
#pnmtoplainpnm logo_01_224.pnm > logo_01_224.ppm
3. Add the ppm file to kernel source code tree
#cp logo_linux_clut224.ppm _logo_linux_clut224_original.ppm
#cp logo_01_224.ppm drivers/video/logo
#mv logo_01_224.ppm logo_linux_clut224.ppm
#make -j 4; make uImage
Tips: make toos will call ./scripts/pnmtologo binary file to auto create logo_linux_clut224.c file