Overview
--------
P2020RDB is a Low End Dual core platform supporting the P2020 processor of QorIQ
series.
The other processors in the Low End and Ultra Low End QorIQ series are:
P1020 32 bit DDR, dual core with a different eTSEC controller.
P1021 32 bit DDR, dual core with QE.
P1011 P1012, single core models of the series.

All are e500 based.

All the above processors are planned to be shipped with the same RDB platform.

Building U-boot
-----------
To build the u-boot for P2020RDB:
	make P2020RDB_config
	make

The code also contains the support  for other processors in the series viz.
P1020RDB_config, P1021RDB_config, P1011RDB_config, P1012RDB_config.

Flash Banks
-----------
RDB board for P2020,P1020,...has two flash banks. They are both present on boot.

Booting is always from the boot bank at 0xec00_0000.


Memory Map
----------

0xef00_0000 - 0xef7f_ffff	Alernate bank		8MB
0xe800_0000 - 0xefff_ffff	Boot bank		8MB

0xef78_0000 - 0xef7f_ffff	Alternate u-boot address	512KB
0xeff8_0000 - 0xefff_ffff	Boot u-boot address		512KB

Switch settings to boot from the NOR flash banks
------------------------------------------------
On the connector P7 on the board,
When jumper is placed across pins 7 & 8 (the default bank is selected)
When jumper is placed across pins 7 & 5 (the alternate bank is selected)

Flashing Images
---------------

To place a new u-boot image in the alternate flash bank and then reset with that
 new image temporarily, use this:

	tftp 1000000 u-boot.bin
	erase ef780000 ef7fffff
	cp.b 1000000 ef780000 80000

Now to boot from the alternate bank change the jumper to short pins 7 & 5
of the P7 connector on the board.

To program the image in the boot flash bank:

	tftp 1000000 u-boot.bin
	protect off all
	erase eff80000 ffffffff
	cp.b 1000000 eff80000 80000

Using the Device Tree Source File
---------------------------------
To create the DTB (Device Tree Binary) image file,
use a command similar to this:

	dtc -b 0 -f -I dts -O dtb p2020rdb.dts > p2020rdb.dtb

Likely, that .dts file will come from here;

	linux-2.6/arch/powerpc/boot/dts/p2020rdb.dts


Booting Linux
-------------

Place a linux uImage in the TFTP disk area.

	tftp 1000000 uImage.p2020rdb
	tftp 2000000 rootfs.ext2.gz.uboot
	tftp c00000 p2020rdb.dtb
	bootm 1000000 2000000 c00000