spl: spl_mmc: provide one weak function spl_boot_partition

The spl_boot_partition function has been added in order to have
the possibility to boot on a same binary from different mmc devices
with different partitions.

By default keep the current behavior, SPL use the partition defined
by CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Christophe KERELLO <christophe.kerello@st.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>

common/spl/spl_mmc.c

@@ -292,6 +292,14 @@ u32 __weak spl_boot_mode(const u32 boot_device)
 #endif
 }
 
+#ifdef CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
+__weak
+int spl_boot_partition(const u32 boot_device)
+{
+	return CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION;
+}
+#endif
+
 int spl_mmc_load_image(struct spl_image_info *spl_image,
 		       struct spl_boot_device *bootdev)
 {
@@ -347,8 +355,11 @@ int spl_mmc_load_image(struct spl_image_info *spl_image,
 				return err;
 		}
 #ifdef CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
-		err = mmc_load_image_raw_partition(spl_image, mmc,
-			CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION);
+		err = spl_boot_partition(bootdev->boot_device);
+		if (!err)
+			return err;
+
+		err = mmc_load_image_raw_partition(spl_image, mmc, err);
 		if (!err)
 			return err;
 #endif

include/spl.h

@@ -82,6 +82,7 @@ int spl_load_simple_fit(struct spl_image_info *spl_image,
 void preloader_console_init(void);
 u32 spl_boot_device(void);
 u32 spl_boot_mode(const u32 boot_device);
+int spl_boot_partition(const u32 boot_device);
 void spl_set_bd(void);
 
 /**