Building U-boot
--------------
To build the u-boot for BSC9131RDB:
-1. NAND Flash
+1. NAND Flash with sysclk 66MHz(J16 on RDB closed, default)
make BSC9131RDB_NAND
-2. SPI Flash
+2. NAND Flash with sysclk 100MHz(J16 on RDB open)
+ make BSC9131RDB_NAND_SYSCLK100
+3. SPI Flash with sysclk 66MHz(J16 on RDB closed, default)
make BSC9131RDB_SPIFLASH
+4. SPI Flash with sysclk 100MHz(J16 on RDB open)
+ make BSC9131RDB_SPIFLASH_SYSCLK100
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