spl: add a generic function board_init_f

This commit add a generic function board_init_f that
only initialize some device (for example serial). It
avoid to define a board function only to launch the
serial configuration.
Signed-off-by: NPhilippe Reynes <philippe.reynes@softathome.com>

common/spl/Kconfig

@@ -25,6 +25,15 @@ config SPL_FRAMEWORK
 	  supports MMC, NAND and YMODEM and other methods loading of U-Boot
 	  and the Linux Kernel.  If unsure, say Y.
 
+config SPL_FRAMEWORK_BOARD_INIT_F
+	bool "Define a generic function board_init_f"
+	depends on SPL_FRAMEWORK
+	help
+	  Define a generic function board_init_f that:
+	  - initialize the spl (spl_early_init)
+	  - initialize the serial (preloader_console_init)
+	  Unless you want to provide your own board_init_f, you should say Y.
+
 config SPL_SIZE_LIMIT
 	hex "Maximum size of SPL image"
 	depends on SPL

common/spl/spl.c

@@ -555,6 +555,24 @@ static int boot_from_devices(struct spl_image_info *spl_image,
 	return -ENODEV;
 }
 
+#if defined(CONFIG_SPL_FRAMEWORK_BOARD_INIT_F)
+void board_init_f(ulong dummy)
+{
+	if (CONFIG_IS_ENABLED(OF_CONTROL)) {
+		int ret;
+
+		ret = spl_early_init();
+		if (ret) {
+			debug("spl_early_init() failed: %d\n", ret);
+			hang();
+		}
+	}
+
+	if (CONFIG_IS_ENABLED(SERIAL_SUPPORT))
+		preloader_console_init();
+}
+#endif
+
 void board_init_r(gd_t *dummy1, ulong dummy2)
 {
 	u32 spl_boot_list[] = {