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| History | |||
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| Version | Issue Date | Notes | |
| Oct 2020 | New documentation layout | ||
| 3.0.0 | Feb 2022 | DESK 3.0.0 release | |
Contents
Customizing the splash screenEdit
ResourcesEdit
For further details on splash screen support in U-Boot, please refer to:
InstructionsEdit
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)
Please note that loadsplash command will differ depends on used storage device.
Splash image in NOR SPI flashEdit
U-Boot variablesEdit
loadsplash=run spi_loadsplash
spi_loadsplash=sf probe; sf read ${splashimage} 0xA00000 ${splashsize}
splashfile=splash_image.bmp
splashimage=0x20000002
splashpos=m,m
splashsize=0x400000
loadsplashfile=tftpboot ${loadaddr} axel/${splashfile}
spi_updatesplash=sf probe; sf erase 0xA00000 +${filesize}; sf write ${loadaddr} 0xA00000 ${filesize}
CommandsEdit
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 flashEdit
U-Boot variablesEdit
mtdparts=mtdparts=gpmi-nand:2M(nand-SPL),6M(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 ${splashsize}
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.
CommandsEdit
The following commands are used to store in NAND flash a BMP image loaded via tftp:
run loadsplashfile run nand_updatesplash
Splash image in SD/eMMCEdit
If an SD card or a eMMC device is used as boot device, the splashscreen image is directly loaded from the storage device.
U-Boot variablesEdit
In this example, the first partition - FAT format - is used directly reading the ${splashimage} BMP file.
loadsplash=run mmc_loadsplash
splashfile=splash_image.bmp
splashimage=0x20000002
mmc_loadsplash=fatload mmc ${mmcdev}:1 ${loadaddr} ${splashfile}; cp.b ${loadaddr} ${splashimage} ${filesize}