[U-Boot] [PATCH v4 09/30] board_f: Add new function to allow runtime DTB selection

[Franklin S Cooper Jr]

Runtime U-boot dtb selection is generally a two step process. First step
is to simply use an initial generic dtb. The second step is to select
the dtb and perhaps execute additional code ones U-boot knows what board
it is running on. Embedded_dtb_select handles the second step by allowing
board specific code to run and perform what ever necessary configuration
that is needed.

Signed-off-by: Franklin S Cooper Jr <fcooper at ti.com>
Reviewed-by: Tom Rini <trini at konsulko.com>
---
 common/Kconfig   | 9 +++++++++
 common/board_f.c | 3 +++
 include/common.h | 4 ++++
 3 files changed, 16 insertions(+)

diff --git a/common/Kconfig b/common/Kconfig
index 0f9ba17..c58f807 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -437,6 +437,15 @@ config SYS_STDIO_DEREGISTER
 
 endmenu
 
+config DTB_RESELECT
+	bool "Support swapping dtbs at a later point in boot"
+	depends on FIT_EMBED
+	help
+	  It is possible during initial boot you may need to use a generic
+	  dtb until you can fully determine the board your running on. This
+	  config allows boards to implement a function at a later point
+	  during boot to switch to the "correct" dtb.
+
 config FIT_EMBED
 	bool "Support a FIT image embedded in the U-boot image"
 	help
diff --git a/common/board_f.c b/common/board_f.c
index 8bf9acc..6d51b51 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -816,6 +816,9 @@ static const init_fnc_t init_sequence_f[] = {
 #if defined(CONFIG_DISPLAY_CPUINFO)
 	print_cpuinfo,		/* display cpu info (and speed) */
 #endif
+#if defined(CONFIG_DTB_RESELECT)
+	embedded_dtb_select,
+#endif
 #if defined(CONFIG_DISPLAY_BOARDINFO)
 	show_board_info,
 #endif
diff --git a/include/common.h b/include/common.h
index 638c45b..739ae45 100644
--- a/include/common.h
+++ b/include/common.h
@@ -359,6 +359,10 @@ int get_env_id (void);
 void	pci_init      (void);
 void	pci_init_board(void);
 
+#if defined(CONFIG_DTB_RESELECT)
+int	embedded_dtb_select(void);
+#endif
+
 int	misc_init_f   (void);
 int	misc_init_r   (void);
 
-- 
2.10.0