splash_source: add support for filesystem formatted mmc
Add support for loading splash image from an SD card formatted with
a filesystem. Update boards to maintain original behavior where needed.
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Tom Rini <trini@konsulko.com>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
diff --git a/doc/README.splashprepare b/doc/README.splashprepare
index a0f0f3c..56c1bef 100644
--- a/doc/README.splashprepare
+++ b/doc/README.splashprepare
@@ -19,3 +19,8 @@
use that splash location.
- If splashsource is undefined, use the first splash location as default.
- If splashsource is set to an unsupported value, do not load a splash screen.
+
+A splash source location can describe either storage with raw data, or storage
+formatted with a file system. In case of a filesystem, the splash screen data is
+loaded as a file. The name of the splash screen file can be controlled with the
+environment variable "splashfile".