powerpc/c29xpcie: add readme document for c29xpcie

Signed-off-by: Po Liu <Po.Liu@freescale.com>

board/freescale/c29xpcie/README

+Overview
+=========
+C29XPCIE board is a series of Freescale PCIe add-in cards to perform
+as public key crypto accelerator or secure key management module.
+It includes C293PCIE board, C293PCIE board and C291PCIE board.
+The Freescale C29x family is a high performance crypto co-processor.
+It combines a single e500v2 core with necessary SEC engines.
+(maximum core frequency 1000/1200 MHz).
+
+The C29xPCIE board features are as follows:
+Memory subsystem:
+	- 512Mbyte unbuffered DDR3 SDRAM discrete devices (32-bit bus)
+	- 64 Mbyte NOR flash single-chip memory
+	- 4 Gbyte NAND flash memory
+	- 1 Mbit AT24C1024 I2C EEPROM
+	- 16 Mbyte SPI memory
+
+Interfaces:
+	- 10/100/1000 BaseT Ethernet ports:
+		- eTSEC1, RGMII: one 10/100/1000 port
+		- eTSEC2, RGMII: one 10/100/1000 port
+	- DUART interface:
+		- DUART interface: supports two UARTs up to 115200 bps for
+		   console display
+
+Board connectors:
+	- Mini-ITX power supply connector
+	- JTAG/COP for debugging
+
+Physical Memory Map on C29xPCIE
+===============================
+Address Start   Address End   Memory type
+0x0_0000_0000 - 0x0_1fff_ffff   512MB DDR
+0xc_0000_0000 - 0xc_8fff_ffff   256MB PCIE memory
+0xf_ec00_0000 - 0xf_efff_ffff   64MB NOR flash
+0xf_ffb0_0000 - 0xf_ffb7_ffff   512KB SRAM
+0xf_ffc0_0000 - 0xf_ffc0_ffff   64KB PCIE IO
+0xf_ffdf_0000 - 0xf_ffdf_0fff   4KB CPLD
+0xf_ffe0_0000 - 0xf_ffef_ffff   1MB CCSR
+
+Serial Port Configuration on C29xPCIE
+=====================================
+Configure the serial port of the attached computer with the following values:
+	-Data rate: 115200 bps
+	-Number of data bits: 8
+	-Parity: None
+	-Number of Stop bits: 1
+	-Flow Control: Hardware/None
+
+Settings of DIP-switch
+======================
+  SW5[1:4]= 1111 and SW5[6]=0 for boot from 16bit NOR flash
+  SW5[1:4]= 0110 and SW5[6]=0 for boot from SPI flash
+Note: 1 stands for 'off', 0 stands for 'on'
+
+Build and program u-boot to NOR flash
+==================================
+1. Build u-boot.bin image example:
+	export ARCH=powerpc
+	export CROSS_COMPILE=/your_path/powerpc-linux-gnu-
+	make C293PCIE
+
+2. Program u-boot.bin into NOR flash
+	=> tftp $loadaddr $uboot
+	=> protect off eff80000 +$filesize
+	=> erase eff80000 +$filesize
+	=> cp.b $loadaddr eff80000 $filesize
+
+3. Check SW5[1:4]= 1111 and SW5[6]=0, then power on.
+
+Alternate NOR bank
+==================
+There are four banks in C29XPCIE board, example to change bank booting:
+1. Program u-boot.bin into alternate NOR bank
+	=> tftp $loadaddr $uboot
+	=> protect off e9f80000 +$filesize
+	=> erase e9f80000 +$filesize
+	=> cp.b $loadaddr e9f80000 $filesize
+
+2. Switch to alternate NOR bank
+	=> cpld_cmd reset altbank [bank]
+	- [bank] bank value select 1-4
+	- bank 1 on the flash 0x0000000~0x0ffffff
+	- bank 2 on the flash 0x1000000~0x1ffffff
+	- bank 3 on the flash 0x2000000~0x2ffffff
+	- bank 4 on the flash 0x3000000~0x3ffffff
+	or set SW5[7]= ON/OFF and SW5[7]= ON/OFF, then power on again.
+
+Build and program u-boot to SPI flash
+==================================
+1. Build u-boot-spi.bin image
+	make C29xPCIE_SPIFLASH_config; make
+	Need the boot_format tool to generate u-boot-spi.bin from the u-boot.bin.
+
+2. Program u-boot-spi.bin into SPI flash
+	=> tftp $loadaddr $uboot-spi
+	=> sf erase 0 100000
+	=> sf write $loadaddr 0 $filesize
+
+3. Check SW5[1:4]= 0110 and SW5[6]=0, then power on.