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--- products:sbc:common:configurations:change-boot-logo [2022/07/18 02:08]
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+++ products:sbc:common:configurations:change-boot-logo [2026/02/02 05:04] (current)
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-====== VIM1S Change Boot Logo ======
+====== Change Boot Logo ======
-{{page>products:sbc:vim4:configurations:change-boot-logo&noheader}}
+===== Introduction =====
+This document explains how to change the boot logo. It is divided into two parts: the first part covers the Ubuntu platform, and the second part covers the Android platform.
+===== Linux =====
+<WRAP info >
+The official Khadas Ubuntu image displays three logos during system boot:
+  * U-Boot logo
+  * Linux kernel logo
+  * Plymouth (Ubuntu) boot splash logo
+</WRAP>
+==== U-Boot Logo ====
+The U-Boot logo is located at ''/usr/share/fenix/logo/logo.bmp''.
+The required image format is BMP with a resolution of ''500x500px'' and a color depth of ''24 bits''.
+You can use the terminal to check the format of the default logo image:
+```shell
+$ file /usr/share/fenix/logo/logo.bmp
+```
+Example output:
+```
+/usr/share/fenix/logo/logo.bmp: PC bitmap, Windows 3.x format, 500 x 500 x 24, image size 750002, resolution 2834 x 2834 px/m, cbSize 750056, bits offset 54
+```
+To change it, simply replace the default ''logo.bmp'' file with your own BMP image that meets the format requirements.
+==== Linux Kernel Logo ====
+Use the netpbm tool to convert a PNG image to the required PPM format.
+```shell
+$ pngtopnm linux_logo.png > linux_logo.pnm
+$ pnmquant 224 linux_logo.pnm > linux_logo_clut224.pnm
+$ pnmtoplainpnm linux_logo_clut224.pnm > logo_linux_clut224.ppm
+```
+Place the generated ''logo_linux_clut224.ppm'' file into the ''drivers/video/logo/'' directory of your Linux kernel source code, replacing the existing file.
+Recompile the kernel. After flashing the new kernel, the boot logo will be updated.
+==== Plymouth (Ubuntu Boot Splash) Logo ====
+The Plymouth logo file is located at ''/usr/share/fenix/logo/logo.png''. Replace this ''.png'' file to change the graphical boot splash screen.
+If you are [[/products/sbc/vim3/development/linux/build-ubuntu| building a custom image with Fenix]], you can change the logo by replacing the file at ''archives/logo/png/logo.png'' before the build.
+===== Android =====
+Starting from Android 10, Rockchip merged the logo partition into the super partition, making it impossible to modify the boot logo dynamically without rebuilding the entire firmware. To address this, a new custom partition has been added to allow for dynamic logo updates.
+==== Logo Format Requirements====
+<WRAP info >
+  * **Source Location:** The original logo file in the Android source code is located at ''kernel-6.1/logo.bmp''.
+  * **Required Format:**
+    * 16-bit RGB565 BMP format.
+    * Resolution should be ≤ 1080P (1920x1080 pixels).
+</WRAP>
+==== Update Logo via ADB ====
+You can push a prepared ''logo.bmp'' file to the device using ADB.
+```shell
+$ adb root
+$ adb remount
+$ adb push logo.bmp /vendor/custom/
+$ adb reboot
+```
+Example command output:
+```shell
+$ adb root
+restarting adbd as root
+$ adb remount
+AVB verification is disabled, disabling verity state may have no effect
+Remounted /system as RW
+Remounted /vendor as RW
+Remounted /odm as RW
+Remounted /system_dlkm as RW
+Remounted /system_ext as RW
+Remounted /vendor_dlkm as RW
+Remounted /odm_dlkm as RW
+Remounted /product as RW
+Remount succeeded
+$ adb push logo.bmp /vendor/custom
+logo.bmp: 1 file pushed, 0 skipped. 655.0 MB/s (4147272 bytes in 0.006s)
+$ adb reboot
+```
+After the device reboots, the new logo should be displayed.
+==== Update Logo by Rebuilding Firmware ====
+This method involves modifying the Android source code and building a complete update package.
+) Replace the logo source: Replace the ''logo.bmp'' file in the ''kernel-6.1/'' directory of your Android source code.
+) build the update package:
+```shell
+$ cd PATH_YOUR_PROJECT
+$ source build/envsetup.sh && lunch kedge2-userdebug
+$ ./build.sh -UCKAu
+```
+This will generate an ''update.img'' file.
+) Flash the firmware: Burn the generated ''update.img'' to your device using the standard upgrade method (refer to the "How To Upgrade" guide). After the device restarts, the new boot logo will be active.

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