Dave Embedded Systems SBC AXEL, Руководство пользователя

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S B C X U s e r ' s G u i d e v . 1 . 0 . 1
7.9 Customizing the splash screen
SBCX provides support for a customizable splash screen. The following
sections describe how to use this feature.
7.9.1 Customizing the splash screen
The splash screen image can be downloaded via tftp to a specific RAM
address (
splashimage
) and then stored in the flash memory.
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)
7.9.2 Additional resources
For further details on splash screen support in U-Boot, please refer to:
● http://www.denx.de/wiki/DULG/UBootSplashScreen
● http://www.denx.de/wiki/DULG/UbootBitmapSupport
7.9.3 Splash image in NOR SPI flash
7.9.3.1 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 0x${filesize}; sf
write ${loadaddr} 0x800000 ${filesize}
December, 2019
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