#
  # Xilinx ZYNQ U-Boot
  #
  # (C) Copyright 2013 Xilinx, Inc.
  #
  # SPDX-License-Identifier:	GPL-2.0+
  #
  
  1. About this
  
  This document describes the information about Xilinx Zynq U-Boot -
  like supported boards, ML status and TODO list.
  
  2. Zynq boards
  
  Xilinx Zynq-7000 All Programmable SoCs enable extensive system level
  differentiation, integration, and flexibility through hardware, software,
  and I/O programmability.
  
  * zc70x
    - zc702 (single qspi, gem0, mmc) [1]
    - zc706 (dual parallel qspi, gem0, mmc) [2]
  * zed (single qspi, gem0, mmc) [3]
  * microzed (single qspi, gem0, mmc) [4]
  * zc770
    - zc770-xm010 (single qspi, gem0, mmc)
    - zc770-xm011 (8 or 16 bit nand)
    - zc770-xm012 (nor)
    - zc770-xm013 (dual parallel qspi, gem1)

  3. Building
  
   # Configure for zc70x board
     $ make zynq_zc70x_config
       Configuring for zynq_zc70x board...
  
   # Building default dts for zc702 board
     $ make
  
   # Building specified dts for zc706 board
     $ make DEVICE_TREE=zynq-zc706
  
  4. Bootmode

  
  Zynq has a facility to read the bootmode from the slcr bootmode register
  once user is setting through jumpers on the board - see page no:1546 on [5]
  
  All possible bootmode values are defined in Table 6-2:Boot_Mode MIO Pins
  on [5].
  
  board_late_init() will read the bootmode values using slcr bootmode register
  at runtime and assign the modeboot variable to specific bootmode string which
  is intern used in autoboot.
  
  SLCR bootmode register Bit[3:0] values
  #define ZYNQ_BM_NOR		0x02
  #define ZYNQ_BM_SD		0x05
  #define ZYNQ_BM_JTAG		0x0
  
  "modeboot" variable can assign any of "norboot", "sdboot" or "jtagboot"
  bootmode strings at runtime.

  5. Mainline status

  
  - Added basic board configurations support.
  - Added zynq u-boot bsp code - arch/arm/cpu/armv7/zynq

  - Added zynq boards named - zc70x, zed, microzed, zc770_xm010, zc770_xm012, zc770_xm013

  - Added zynq drivers:
    serial - drivers/serial/serial_zynq.c
    net - drivers/net/zynq_gem.c
    mmc - drivers/mmc/zynq_sdhci.c
    mmc - drivers/mmc/zynq_sdhci.c
    spi-  drivers/spi/zynq_spi.c
    i2c - drivers/i2c/zynq_i2c.c

  - Done proper cleanups on board configurations
  - Added basic FDT support for zynq boards
  - d-cache support for zynq_gem.c

  6. TODO

  - Add zynq boards support - zc770_xm011

  - Add zynq qspi controller driver
  - Add zynq nand controller driver

  - Add FDT support on individual drivers

  
  [1] http://www.xilinx.com/products/boards-and-kits/EK-Z7-ZC702-G.htm
  [2] http://www.xilinx.com/products/boards-and-kits/EK-Z7-ZC706-G.htm
  [3] http://zedboard.org/product/zedboard
  [4] http://zedboard.org/product/microzed

  [5] http://www.xilinx.com/support/documentation/user_guides/ug585-Zynq-7000-TRM.pdf

  
  --
  Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
  Sun Dec 15 14:52:41 IST 2013