video: mxc_ipuv3_fb: stash frame buffer pointer in global data.

This patch updates the i.MX video driver to store the
frame-buffer address in the fb_base field of the global
data structure *gd.

By doing this, you can find the frame buffer address
using the 'bdinfo' command:

	U-Boot > bdinfo
	arch_number = 0x00000EB9
	...
	FB base     = 0x4F35F1C0

This is very useful when debugging display connections.

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>
Acked-by: Marek Vasut <marex@denx.de>

drivers/video/mxc_ipuv3_fb.c

@@ -13,6 +13,7 @@
 
 #include <common.h>
 #include <asm/errno.h>
+#include <asm/global_data.h>
 #include <linux/string.h>
 #include <linux/list.h>
 #include <linux/fb.h>
@@ -24,6 +25,8 @@
 #include "mxcfb.h"
 #include "ipu_regs.h"
 
+DECLARE_GLOBAL_DATA_PTR;
+
 static int mxcfb_map_video_memory(struct fb_info *fbi);
 static int mxcfb_unmap_video_memory(struct fb_info *fbi);
 
@@ -415,6 +418,8 @@ static int mxcfb_map_video_memory(struct fb_info *fbi)
 
 	fbi->screen_size = fbi->fix.smem_len;
 
+	gd->fb_base = fbi->fix.smem_start;
+
 	/* Clear the screen */
 	memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);