splash: get devpart from environment variable

By default several types of splash locations are supported and the
user can select one of them through environment var (splashsource).

However the devpart is still hardcoded and we cannot change it from
the environment.

This patch add the support of "splashdevpart" which allow the user to
set the devpart though this environment variable.

Example: image located in splashscreen partition (MMC as raw)
```
splashsource=mmc_raw
splashdevpart=0#splashscreen
```

Signed-off-by: Julien Masson <jmasson@baylibre.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/common/splash_source.c b/common/splash_source.c
index 68c9fa371b72ca0e863c750b48dfedf471be8266..a260137619806e3a0dd1ec41cb5bf8749be96b36 100644 (file)
--- a/common/splash_source.c
+++ b/common/splash_source.c
@@ -448,6 +448,7 @@ int splash_source_load(struct splash_location *locations, uint size)
 {
        struct splash_location *splash_location;
        char *env_splashimage_value;
+       char *devpart;
        u32 bmp_load_addr;
 
        env_splashimage_value = env_get("splashimage");
@@ -464,6 +465,10 @@ int splash_source_load(struct splash_location *locations, uint size)
        if (!splash_location)
                return -EINVAL;
 
+       devpart = env_get("splashdevpart");
+       if (devpart)
+               splash_location->devpart = devpart;
+
        if (splash_location->flags == SPLASH_STORAGE_RAW)
                return splash_load_raw(splash_location, bmp_load_addr);
        else if (splash_location->flags == SPLASH_STORAGE_FS)