[U-Boot] [Patch v4 1/2] common/board_f: Initialized global data for generic board

[York Sun]

Some platforms (tested on mpc85xx, mpc86xx) use global data before calling
function baord_inti_f(). The data should not be cleared later. Any arch
which uses global data in generic board board_init_f() should define
CONFIG_SYS_GENERIC_GLOBAL_DATA.

Signed-off-by: York Sun <yorksun at freescale.com>
CC: Scott Wood <scottwood at freescale.com>
CC: Simon Glass <sjg at chromium.org>
CC: Albert ARIBAUD <albert.u.boot at aribaud.net>
---
Change log

 v4: Replace with CONFIG_SYS_GENERIC_GLOBAL_DATA, a positive logic
 v3: Introduce CONFIG_SYS_EARLY_GD instead of using a list
 v2: Instead of adding back gd init for all PPC, preserve gd for mpc85xx and mpc86xx.

 README                         |    6 ++++++
 arch/arc/include/asm/config.h  |    2 ++
 arch/arm/include/asm/config.h  |    2 ++
 arch/mips/include/asm/config.h |    2 ++
 common/board_f.c               |   12 +++++++-----
 5 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/README b/README
index 12758dc..c66f988 100644
--- a/README
+++ b/README
@@ -440,6 +440,12 @@ The following options need to be configured:
 		supported, core will start to execute uboot when wakes up.
 
 - Generic CPU options:
+		CONFIG_SYS_GENERIC_GLOBAL_DATA
+		Defines global data is initialized in generic board board_init_f().
+		If this macro is defined, global data is created and cleared in
+		generic board board_init_f(). Without this macro, architecture/board
+		should initialize global data before calling board_init_f().
+
 		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
 
 		Defines the endianess of the CPU. Implementation of those
diff --git a/arch/arc/include/asm/config.h b/arch/arc/include/asm/config.h
index 5761def..3d331cc 100644
--- a/arch/arc/include/asm/config.h
+++ b/arch/arc/include/asm/config.h
@@ -7,6 +7,8 @@
 #ifndef __ASM_ARC_CONFIG_H_
 #define __ASM_ARC_CONFIG_H_
 
+#define CONFIG_SYS_GENERIC_GLOBAL_DATA
+
 #define CONFIG_LMB
 
 #endif /*__ASM_ARC_CONFIG_H_ */
diff --git a/arch/arm/include/asm/config.h b/arch/arm/include/asm/config.h
index abf79e5..2a20a77 100644
--- a/arch/arm/include/asm/config.h
+++ b/arch/arm/include/asm/config.h
@@ -7,6 +7,8 @@
 #ifndef _ASM_CONFIG_H_
 #define _ASM_CONFIG_H_
 
+#define CONFIG_SYS_GENERIC_GLOBAL_DATA
+
 #define CONFIG_LMB
 #define CONFIG_SYS_BOOT_RAMDISK_HIGH
 
diff --git a/arch/mips/include/asm/config.h b/arch/mips/include/asm/config.h
index 3a891ba..1c8a42b 100644
--- a/arch/mips/include/asm/config.h
+++ b/arch/mips/include/asm/config.h
@@ -7,6 +7,8 @@
 #ifndef _ASM_CONFIG_H_
 #define _ASM_CONFIG_H_
 
+#define CONFIG_SYS_GENERIC_GLOBAL_DATA
+
 #define CONFIG_LMB
 #define CONFIG_SYS_BOOT_RAMDISK_HIGH
 
diff --git a/common/board_f.c b/common/board_f.c
index cbdf06f..7601a98 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -970,20 +970,22 @@ static init_fnc_t init_sequence_f[] = {
 
 void board_init_f(ulong boot_flags)
 {
-#ifndef CONFIG_X86
+#ifdef CONFIG_SYS_GENERIC_GLOBAL_DATA
+	/*
+	 * For some archtectures, global data is initialized and used before
+	 * calling this function. The data should be preserved. For others,
+	 * CONFIG_SYS_GENERIC_GLOBAL_DATA should be defined and use the stack
+	 * here to host global data until relocation.
+	 */
 	gd_t data;
 
 	gd = &data;
-#endif
 
 	/*
 	 * Clear global data before it is accessed at debug print
 	 * in initcall_run_list. Otherwise the debug print probably
 	 * get the wrong vaule of gd->have_console.
 	 */
-#if !defined(CONFIG_CPM2) && !defined(CONFIG_MPC512X) && \
-		!defined(CONFIG_MPC83xx) && !defined(CONFIG_MPC85xx) && \
-		!defined(CONFIG_MPC86xx) && !defined(CONFIG_X86)
 	zero_global_data();
 #endif
 
-- 
1.7.9.5