[U-Boot] [PATCH v3] Don't grab memory for LCD if FB address is defined

[Minkyu Kang]

If FB address is defined specific address then don't grab memory for LCD

Signed-off-by: Minkyu Kang <mk7.kang at samsung.com>
Cc: Albert Aribaud <albert.aribaud at free.fr>
Cc: Wolfgang Denk <wd at denx.de>
Cc: Stefan Roese <sr at denx.de>
Cc: Kim Phillips <kim.phillips at freescale.com>
Cc: Andy Fleming <afleming at gmail.com>
Cc: Kumar Gala <kumar.gala at freescale.com>
---
v3
 fix whitespace errors
v2
 add document

 arch/arm/lib/board.c     |    4 ++++
 arch/m68k/lib/board.c    |    4 ++++
 arch/powerpc/lib/board.c |    4 ++++
 doc/README.fb_addr       |   17 +++++++++++++++++
 4 files changed, 29 insertions(+), 0 deletions(-)
 create mode 100644 doc/README.fb_addr

diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index c620d2c..5a4d2bd 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -356,9 +356,13 @@ void board_init_f (ulong bootflag)
 #endif /* CONFIG_VFD */
 
 #ifdef CONFIG_LCD
+#ifdef CONFIG_FB_ADDR
+	gd->fb_base = CONFIG_FB_ADDR;
+#else
 	/* reserve memory for LCD display (always full pages) */
 	addr = lcd_setmem (addr);
 	gd->fb_base = addr;
+#endif /* CONFIG_FB_ADDR */
 #endif /* CONFIG_LCD */
 
 	/*
diff --git a/arch/m68k/lib/board.c b/arch/m68k/lib/board.c
index 7867ba5..a6cd9b8 100644
--- a/arch/m68k/lib/board.c
+++ b/arch/m68k/lib/board.c
@@ -277,9 +277,13 @@ board_init_f (ulong bootflag)
 	debug ("Top of RAM usable for U-Boot at: %08lx\n", addr);
 
 #ifdef CONFIG_LCD
+#ifdef CONFIG_FB_ADDR
+	gd->fb_base = CONFIG_FB_ADDR;
+#else
 	/* reserve memory for LCD display (always full pages) */
 	addr = lcd_setmem (addr);
 	gd->fb_base = addr;
+#endif /* CONFIG_FB_ADDR */
 #endif /* CONFIG_LCD */
 
 	/*
diff --git a/arch/powerpc/lib/board.c b/arch/powerpc/lib/board.c
index b88cf6b..09c20e9 100644
--- a/arch/powerpc/lib/board.c
+++ b/arch/powerpc/lib/board.c
@@ -453,9 +453,13 @@ void board_init_f (ulong bootflag)
 	debug ("Top of RAM usable for U-Boot at: %08lx\n", addr);
 
 #ifdef CONFIG_LCD
+#ifdef CONFIG_FB_ADDR
+	gd->fb_base = CONFIG_FB_ADDR;
+#else
 	/* reserve memory for LCD display (always full pages) */
 	addr = lcd_setmem (addr);
 	gd->fb_base = addr;
+#endif /* CONFIG_FB_ADDR */
 #endif /* CONFIG_LCD */
 
 #if defined(CONFIG_VIDEO) && defined(CONFIG_8xx)
diff --git a/doc/README.fb_addr b/doc/README.fb_addr
new file mode 100644
index 0000000..ea8bca6
--- /dev/null
+++ b/doc/README.fb_addr
@@ -0,0 +1,17 @@
+Define CONFIG_FB_ADDR if you want to use specific address for frame buffer.
+Then system will reserve the frame buffer address to defined address instead of
+lcd_setmem (this function grab the memory for frame buffer by panel's size).
+
+Please see below code (in board_init_f function from arch/arm/lib/board.c)
+
+#ifdef CONFIG_FB_ADDR
+	gd->fb_base = CONFIG_FB_ADDR;
+#else
+	/* reserve memory for LCD display (always full pages) */
+	addr = lcd_setmem (addr);
+	gd->fb_base = addr;
+#endif /* CONFIG_FB_ADDR */
+
+If you want this config option then please define it at your board config file
+
+#define CONFIG_FB_ADDR		0x00000000
-- 
1.7.1