board/bsc9131rdb: Update default boot environment settings

BSC9131RDB has 1GB DDR.
Out of this, only 880MB is passed on to Linux via bootm_size.
Remaining
-16MB is reserved for PowerPC-DSP shared control area
-128MB is reserved for DSP private area.

Also 256MB, out of this 880MB is required for data communication between
PowerPC and DSP core.
For this bootargs are modified to pass parameter to create 1 hugetlb
page of 256MB via default_hugepagesz, hugepagesz and hugepages

Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

board/freescale/bsc9131rdb/README

@@ -111,6 +111,16 @@ Memory map
  0xFF70_0000	0xFF7F_FFFF	PA CCSR			1M
  0xFF80_0000	0xFFFF_FFFF	Boot Page & NAND Buffer 8M
 
+DDR Memory map
+---------------
+ 0x0000_0000	0x36FF_FFFF	Memory passed onto Linux
+ 0x3700_0000	0x37FF_FFFF	PowerPC-DSP shared control area
+ 0x3800_0000	0x4FFF_FFFF	DSP Private area
+
+ Out of 880M, passed onto Linux, 1hugetlb page of 256M is reserved for
+ data communcation between PowerPC and DSP core.
+ Rest is PowerPC private area.
+
 Flashing Images
 ---------------
 To place a new u-boot image in the NAND flash and then boot

include/configs/BSC9131RDB.h

@@ -442,7 +442,9 @@ extern unsigned long get_sdram_size(void);
 	"fdtfile=bsc9131rdb.dtb\0"		\
 	"bdev=sda1\0"	\
 	"hwconfig=usb1:dr_mode=host,phy_type=ulpi\0"	\
-	"othbootargs=ramdisk_size=600000 \0" \
+	"bootm_size=0x37000000\0"	\
+	"othbootargs=ramdisk_size=600000 " \
+	"default_hugepagesz=256m hugepagesz=256m hugepages=1\0" \
 	"usbext2boot=setenv bootargs root=/dev/ram rw "	\
 	"console=$consoledev,$baudrate $othbootargs; "	\
 	"usb start;"			\