Customizing the splash screen (Axel)

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Info Box
Axel-04.png Applies to Axel Ultra
Axel-lite 02.png Applies to Axel Lite
Axel-02.png Applies to AXEL ESATTA

Introduction

Starting from version 2013.04-xelk-2.2.0, U-Boot for Axel SOMs provides support for a customizable splash screen. The following sections describe how to use this feature.

Resources

For further details on splash screen support in U-Boot, please refer to:

Customizing the splash screen

The following U-Boot environment variables are required:

  • splashimage: RAM address where the BMP image is loaded. Please note that it must be a 32-bit aligned address with a 0x2 offset (eg: 0x20000002)
  • loadsplash: comand for loading the BMP image from the storage device (e.g flash memory) to RAM. This command is automatically run by U-Boot at startup
  • splashpos: image position (eg: splashpos=m,m, for centering the image)

Splash image in NOR SPI flash

U-Boot variables

loadsplash=run spi_loadsplash
spi_loadsplash=sf probe; sf read ${splashimage} 0x800000 ${splashsize}
splashfile=splash_image.bmp
splashimage=0x20000002
splashpos=m,m
splashsize=0x400000
loadsplashfile=tftpboot ${loadaddr} axel/${splashfile}
spi_updatesplash=sf probe; sf erase 0x800000 +${filesize}; sf write ${loadaddr} 0x800000 ${filesize}

Commands

The following commands are used to store in NOR SPI flash a BMP image loaded via tftp:

run loadsplashfile
run spi_updatesplash

Splash image in NAND flash

U-Boot variables

mtdparts=mtdparts=gpmi-nand:8M(nand-uboot),1M(nand-env1),1M(nand-env2),1M(nand-fdt),1M(nand-spare),8M(nand-kernel),4M(nand-splash),-(nand-ubi)
loadsplash=run nand_loadsplash
nand_loadsplash=nand read ${splashimage} nand-splash
splashfile=splash_image.bmp
splashimage=0x20000002
splashpos=m,m
splashsize=0x400000
loadsplashfile=tftpboot ${loadaddr} axel/${splashfile}
nand_updatesplash=nand erase.part nand-splash; nand write ${loadaddr} nand-splash ${filesize}

Please note that the NAND mtd partition for the splash image (nand-splash) is defined using the mtdparts parameter, and then referenced by the nand {erase,read,write} commands.

Commands

The following commands are used to store in NAND flash a BMP image loaded via tftp:

run loadsplashfile
run nand_updatesplash