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- i.MX series products like\u00a0NX8MM-35<\/mark><\/a>\u00a0\/\u00a0PN8M-090T<\/mark><\/a>\u00a0<\/mark>\/\u00a0<\/mark>EBOX-IMX8MM<\/mark><\/a>\n
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- In this tips, we use PN8M-090T as an example.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
- Yocto Linux 4.0:Recipe (Find the recipe file from our\u00a0<\/mark>Wiki<\/mark><\/a>)<\/li>\n\n\n\n
- Image file of your logo \/ photo<\/li>\n\n\n\n
- Operating system for building the image: Ubuntu 22.04 or after<\/li>\n<\/ol>\n\n\n\n
\n\n\n\n1. Making a ppm image file with 224 colors<\/strong><\/h3>\n\n\n\n
First, prepare a custom boot image and convert it to a Linux-compatible PPM file (the image should be saved with a .ppm extension in ASCII format and have a maximum of 224 colors).
Please follow the steps below to change the image to the correct format:<\/p>\n\n\n\n1.Using pngtopnm to change the .png file to .pnm file.<\/p>\n\n\n\n
pngtopnm xxxx.png>linuxlogo.pnm<\/code><\/p>\n\n\n\n(xxxx=your file name)<\/p>\n\n\n\n
![\"\"](\"https:\/\/icop-shop.com\/wp-content\/uploads\/2025\/09\/PNG2PNM-1024x576.png\" "\\"\\"")
<\/a><\/figure>\n\n\n\n2. pnmquant 224 to change the color to 224 colors<\/p>\n\n\n\n
pnmquant 224 linuxlogo.pnm>linuxlogo224.pnm<\/code><\/p>\n\n\n\n![\"\"](\"https:\/\/icop-shop.com\/wp-content\/uploads\/2025\/09\/PNM224.2-1024x576.png\" "\\"\\"")
<\/a><\/figure>\n\n\n\n3. pnmtoplainpnm to change the file to change the .pnm file to .ppm file.<\/p>\n\n\n\n
pnmtoplainpnm linuxlogo224.pnm>logo_linux_clut224.ppm<\/code><\/p>\n\n\n\n![\"\"](\"https:\/\/icop-shop.com\/wp-content\/uploads\/2025\/09\/PNM2PPM.3-1024x576.png\" "\\"\\"")
<\/a><\/figure>\n\n\n\nBy the steps above, we can change the PNG file to 224 colors .ppm file.<\/p>\n\n\n\n
2. Replace the old boot image and build the image file<\/strong><\/h3>\n\n\n\n
In this case, we assume the user already know how to build a image file by recipe, and already has the recipe file.
If the recipe file is no implemented, check\u00a0here<\/mark><\/a>\u00a0for an example.<\/p>\n\n\n\n1. Copy the logo_linux_clut224.ppm to the logo file.<\/p>\n\n\n\n
cp logo_linux_clut224.ppm kernel-source\/drivers\/video\/logo<\/code><\/p>\n\n\n\n\u00a0 kernel-source\/drivers\/video\/logo is the relative location, in this case, the exact location is:<\/p>\n\n\n\n
\/home\/user\/imx-yocot-bsp\/build-dmp\/tmp\/work-sahred\/dm421\/kernel-source\/drivers\/video\/logo<\/code><\/p>\n\n\n\n![\"\"](\"https:\/\/icop-shop.com\/wp-content\/uploads\/2025\/09\/CPPPM2LOGO2.4-1024x576.png\" "\\"\\"")
<\/a><\/figure>\n\n\n\nThe exact location will be diffrerent based on the user’s setting.<\/p>\n\n\n\n
2. After replaced the logo file, run bitbake command below to compile linux-imx in the recipe after created the image setup environment. (Check step 7 ~9\u00a0here<\/mark><\/a>\u00a0<\/mark>for setup environment.)<\/p>\n\n\n\n
bitbake -c compile -f linux-imx<\/code><\/p>\n\n\n\n![\"\"](\"https:\/\/icop-shop.com\/wp-content\/uploads\/2025\/09\/Bitbakecompile.5-1024x576.png\" "\\"\\"")
<\/a><\/figure>\n\n\n\n3. Generate the image file by bitbake<\/p>\n\n\n\n
bitbake imx-yocto-multimedia<\/code><\/p>\n\n\n\n![\"\"](\"https:\/\/icop-shop.com\/wp-content\/uploads\/2025\/09\/bitbakeimage.6-1024x576.png\" "\\"\\"")
<\/a><\/figure>\n\n\n\nIn this case, we use imx-yocto-multimedia, the user can decide which kind of image they would like to generate; the detailed information is as below:<\/p>\n\n\n\n
![\"\"](\"https:\/\/icop-shop.com\/wp-content\/uploads\/2025\/09\/Bootimage.7-1024x624.jpg\" "\\"\\"")
<\/a><\/figure>\n\n\n\n![\"\"](\"https:\/\/icop-shop.com\/wp-content\/uploads\/2025\/09\/NX8MM_armBased-img2-1024x365.jpg\" "\\"\\"")
<\/a><\/figure>\n\n\n\n