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The splash image could be loaded from different sources (e.g. sf, mmc) with different formats (e.g. raw, file-system). These sources are structured by a board dependent object 'splash_location'. To decide where is the splash image loaded, following environment variables are used to select the splash source and file: - 'splashsource' is used to select the splash source by setting its value to specified name of splash location. - 'splashfile' specify the name of splash image file But, when loads the splash image from FIT, the name of splash image within FIT is specified by splash location name. Due to the splash location name is already used for the splash source, its name may conflicts with the name of splash image. To solve the conflict, the environment variable 'splashfile' is used to specify the splash image in FIT, and keeps the splash location name for the splash source. Signed-off-by: Leo Ruan <tingquan.ruan@cn.bosch.com> Signed-off-by: Mark Jonas <mark.jonas@de.bosch.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Stefano Babic <sbabic@denx.de> Reviewed-by: Tomas Melin <tomas.melin@vaisala.com>
35 lines
1.7 KiB
Plaintext
35 lines
1.7 KiB
Plaintext
---------------------------------------------------------------------
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Splash Screen
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---------------------------------------------------------------------
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The splash_screen_prepare() function is a weak function defined in
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common/splash.c. It is called as part of the splash screen display
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sequence. It gives the board an opportunity to prepare the splash
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image data before it is processed and sent to the frame buffer by
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U-Boot. Define your own version to use this feature.
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CONFIG_SPLASH_SOURCE
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Use the splash_source.c library. This library provides facilities to declare
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board specific splash image locations, routines for loading splash image from
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supported locations, and a way of controlling the selected splash location
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using the "splashsource" environment variable.
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splashsource works as follows:
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- If splashsource is set to a supported location name as defined by board code,
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use that splash location.
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- If splashsource is undefined, use the first splash location as default.
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- If splashsource is set to an unsupported value, do not load a splash screen.
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A splash source location can describe either storage with raw data, a storage
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formatted with a file system or a FIT image. In case of a filesystem, the splash
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screen data is loaded as a file. The name of the splash screen file can be
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controlled with the environment variable "splashfile".
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To enable loading the splash image from a FIT image, CONFIG_FIT must be
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enabled. The FIT image has to start at the 'offset' field address in the
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selected splash location. The name of splash image within the FIT shall be
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specified by the environment variable "splashfile".
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In case the environment variable "splashfile" is not defined the default name
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'splash.bmp' will be used.
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