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Overview
--------
The LS1021AQDS is a Freescale reference board that hosts the LS1021A SoC.

LS1021A SoC Overview
------------------
The QorIQ LS1 family, which includes the LS1021A communications processor,
is built on Layerscape architecture, the industry's first software-aware,
core-agnostic networking architecture to offer unprecedented efficiency
and scale.

A member of the value-performance tier, the QorIQ LS1021A processor provides
extensive integration and power efficiency for fanless, small form factor
enterprise networking applications. Incorporating dual ARM Cortex-A7 cores
running up to 1.0 GHz, the LS1021A processor delivers pre-silicon CoreMark
performance of over 6,000, as well as virtualization support, advanced
security features and the broadest array of high-speed interconnects and
optimized peripheral features ever offered in a sub-3 W processor.

The QorIQ LS1021A processor features an integrated LCD controller,
CAN controller for implementing industrial protocols, DDR3L/4 running
up to 1600 MHz, integrated security engine and QUICC Engine, and ECC
protection on both L1 and L2 caches. The LS1021A processor is pin- and
software-compatible with the QorIQ LS1020A and LS1022A processors.

The LS1021A SoC includes the following function and features:

 - ARM Cortex-A7 MPCore compliant with ARMv7-A architecture
 - Dual high-preformance ARM Cortex-A7 cores, each core includes:
   - 32 Kbyte L1 Instruction Cache and Data Cache for each core (ECC protection)
   - 512 Kbyte shared coherent L2 Cache (with ECC protection)
   - NEON Co-processor (per core)
   - 40-bit physical addressing
   - Vector floating-point support
 - ARM Core-Link CCI-400 Cache Coherent Interconnect
 - One DDR3L/DDR4 SDRAM memory controller with x8/x16/x32-bit configuration
   supporting speeds up to 1600Mtps
   - ECC and interleaving support
 - VeTSEC Ethernet complex
   - Up to 3x virtualized 10/100/1000 Ethernet controllers
   - MII, RMII, RGMII, and SGMII support
   - QoS, lossless flow control, and IEEE 1588 support
 - 4-lane 6GHz SerDes
 - High speed interconnect (4 SerDes lanes with are muxed for these protocol)
   - Two PCI Express Gen2 controllers running at up to 5 GHz
   - One Serial ATA 3.0 supporting 6 GT/s operation
   - Two SGMII interfaces supporting 1000 Mbps
 - Additional peripheral interfaces
   - One high-speed USB 3.0 controller with integrated PHY and one high-speed
     USB 2.00 controller with ULPI
   - Integrated flash controller (IFC) with 16-bit interface
   - Quad SPI NOR Flash
   - One enhanced Secure digital host controller
   - Display controller unit (DCU) 24-bit RGB (12-bit DDR pin interface)
   - Ten UARTs comprised of two 16550 compliant DUARTs, and six low power
     UARTs
   - Three I2C controllers
   - Eight FlexTimers four supporting PWM and four FlexCAN ports
   - Four GPIO controllers supporting up to 109 general purpose I/O signals
 - Integrated advanced audio block:
   - Four synchronous audio interfaces (SAI)
   - Sony/Philips Digital Interconnect Format (SPDIF)
   - Asynchronous Sample Rate Converter (ASRC)
 - Hardware based crypto offload engine
   - IPSec forwarding at up to 1Gbps
   - QorIQ Trust Architecture, Secure Boot, and ARM TrustZone supported
   - Public key hardware accelerator
   - True Random Number Generator (NIST Certified)
   - Advanced Encryption Standard Accelerators (AESA)
   - Data Encryption Standard Accelerators
 - QUICC Engine ULite block
   - Two universal communication controllers (TDM and HDLC) supporting 64
   multichannels, each running at 64 Kbps
   - Support for 256 channels of HDLC
 - QorIQ TrustArchitecture with Secure Boot, as well as ARM TrustZone supported

LS1021AQDS board Overview
-------------------------
 - DDR Controller
     - Supports rates of up to 1600 MHz data-rate
     - Supports one DDR3LP UDIMM, of single-, dual- types.
 - IFC/Local Bus
     - NAND flash: 512M 8-bit NAND flash
     - NOR: 128MB 16-bit NOR Flash
 - Ethernet
     - Three on-board RGMII 10/100/1G ethernet ports.
 - FPGA
 - Clocks
     - System and DDR clock (SYSCLK, DDRCLK)
     - SERDES clocks
 - Power Supplies
 - SDHC
     - SDHC/SDXC connector
 - Other IO
    - Two Serial ports
    - Three I2C ports

Memory map
-----------
The addresses in brackets are physical addresses.

Start Address	End Address	Description			Size
0x00_0000_0000	0x00_000F_FFFF	Secure Boot ROM			1MB
0x00_0100_0000	0x00_0FFF_FFFF	CCSRBAR				240MB
0x00_1000_0000	0x00_1000_FFFF	OCRAM0				64KB
0x00_1001_0000	0x00_1001_FFFF	OCRAM1				64KB
0x00_2000_0000	0x00_20FF_FFFF	DCSR				16MB
0x00_4000_0000	0x00_5FFF_FFFF	QSPI				512MB
0x00_6000_0000	0x00_67FF_FFFF	IFC - NOR Flash			128MB
0x00_7E80_0000	0x00_7E80_FFFF	IFC - NAND Flash		64KB
0x00_7FB0_0000	0x00_7FB0_0FFF	IFC - FPGA			4KB
0x00_8000_0000	0x00_FFFF_FFFF	DRAM1				2GB

LS1021a rev1.0 Soc specific Options/Settings
--------------------------------------------
If the LS1021a Soc is rev1.0, you need modify the configure file.
Add the following define in include/configs/ls1021aqds.h:
#define CONFIG_SKIP_LOWLEVEL_INIT