Overview
--------
The LS2085A Reference Design (RDB) is a high-performance computing,
evaluation, and development platform that supports the QorIQ LS2085A
Layerscape Architecture processor.

LS2085A SoC Overview
------------------
The LS2085A integrated multicore processor combines eight ARM Cortex-A57
processor cores with high-performance data path acceleration logic and network
and peripheral bus interfaces required for networking, telecom/datacom,
wireless infrastructure, and mil/aerospace applications.

The LS2085A SoC includes the following function and features:

 - Eight 64-bit ARM Cortex-A57 CPUs
 - 1 MB platform cache with ECC
 - Two 64-bit DDR4 SDRAM memory controllers with ECC and interleaving support
 - One secondary 32-bit DDR4 SDRAM memory controller, intended for use by
  the AIOP
 - Data path acceleration architecture (DPAA2) incorporating acceleration for
 the following functions:
   - Packet parsing, classification, and distribution (WRIOP)
   - Queue and Hardware buffer management for scheduling, packet sequencing, and
     congestion management, buffer allocation and de-allocation (QBMan)
   - Cryptography acceleration (SEC) at up to 10 Gbps
   - RegEx pattern matching acceleration (PME) at up to 10 Gbps
   - Decompression/compression acceleration (DCE) at up to 20 Gbps
   - Accelerated I/O processing (AIOP) at up to 20 Gbps
   - QDMA engine
 - 16 SerDes lanes at up to 10.3125 GHz
 - Ethernet interfaces
   - Up to eight 10 Gbps Ethernet MACs
   - Up to eight 1 / 2.5 Gbps Ethernet MACs
 - High-speed peripheral interfaces
   - Four PCIe 3.0 controllers, one supporting SR-IOV
 - Additional peripheral interfaces
   - Two serial ATA (SATA 3.0) controllers
   - Two high-speed USB 3.0 controllers with integrated PHY
   - Enhanced secure digital host controller (eSDXC/eMMC)
   - Serial peripheral interface (SPI) controller
   - Quad Serial Peripheral Interface (QSPI) Controller
   - Four I2C controllers
   - Two DUARTs
   - Integrated flash controller (IFC 2.0) supporting NAND and NOR flash
 - Support for hardware virtualization and partitioning enforcement
 - QorIQ platform's trust architecture 3.0
 - Service processor (SP) provides pre-boot initialization and secure-boot
  capabilities

 LS2085ARDB board Overview
 -----------------------
 - SERDES Connections, 16 lanes supporting:
      - PCI Express - 3.0
      - SATA 3.0
      - XFI
 - DDR Controller
     - Two ports of 72-bits (8-bits ECC) DDR4. Each port supports four
       chip-selects and two DIMM connectors. Support is up to 2133MT/s.
     - One port of 40-bits (8-bits ECC) DDR4 which supports four chip-selects
       and two DIMM connectors. Support is up to 1600MT/s.
 -IFC/Local Bus
    - IFC rev. 2.0 implementation supporting Little Endian connection scheme.
    - 128 MB NOR flash 16-bit data bus
    - One 2 GB NAND flash with ECC support
    - CPLD connection
 - USB 3.0
    - Two high speed USB 3.0 ports
    - First USB 3.0 port configured as Host with Type-A connector
    - Second USB 3.0 port configured as OTG with micro-AB connector
 - SDHC adapter
    - SD Card Rev 2.0 and Rev 3.0
 - DSPI
    - 128 MB high-speed flash Memory for boot code and storage (up to 108MHz)
 - 4 I2C controllers
 - Two SATA onboard connectors
 - UART
 - ARM JTAG support

Memory map from core's view
----------------------------
0x00_0000_0000 .. 0x00_000F_FFFF	Boot Rom
0x00_0100_0000 .. 0x00_0FFF_FFFF	CCSR
0x00_1800_0000 .. 0x00_181F_FFFF	OCRAM
0x00_3000_0000 .. 0x00_3FFF_FFFF	IFC region #1
0x00_8000_0000 .. 0x00_FFFF_FFFF	DDR region #1
0x05_1000_0000 .. 0x05_FFFF_FFFF	IFC region #2
0x80_8000_0000 .. 0xFF_FFFF_FFFF	DDR region #2

Other addresses are either reserved, or not used directly by u-boot.
This list should be updated when more addresses are used.

IFC region map from core's view
-------------------------------
During boot i.e. IFC Region #1:-
  0x30000000 - 0x37ffffff : 128MB : NOR flash
  0x3C000000 - 0x40000000 : 64MB  : CPLD

After relocate to DDR i.e. IFC Region #2:-
  0x5_1000_0000..0x5_1fff_ffff	Memory Hole
  0x5_2000_0000..0x5_3fff_ffff	IFC CSx (CPLD, NAND and others 512MB)
  0x5_4000_0000..0x5_7fff_ffff	ASIC or others 1GB
  0x5_8000_0000..0x5_bfff_ffff	IFC CS0 1GB (NOR/Promjet)
  0x5_C000_0000..0x5_ffff_ffff	IFC CS1 1GB (NOR/Promjet)

Booting Options
---------------
a) NOR boot
b) NAND boot

Booting Linux flavors which do not support 48-bit VA (< Linux 3.18)
-------------------------------------------------------------------
One needs to use appropriate bootargs to boot Linux flavors which do
not support 48-bit VA (for e.g. < Linux 3.18) by appending mem=2048M, as shown
below:

=> setenv bootargs 'console=ttyS1,115200 root=/dev/ram
   earlycon=uart8250,mmio,0x21c0600,115200 default_hugepagesz=2m hugepagesz=2m
   hugepages=16 mem=2048M'

