英语文档阅读学习系列之Zynq-7000 EPP Software Developers Guide

阅读ug821-zynq-7000-swdev记录

1、略看目录Table

依旧采用总说加解释的模式，这种方式易于查找，是可靠的框架。目录词条依次为：

Introduction
Software Application Development Flows
Boot and Configuration
Linux
Additional Resources　　

从中可以大概地看到这个手册的讲述内容是关于zynq的软件开发的配置部分，例如boot电脑操作和初始化，linux配置和初始化。

2、细看第一节introduction

1.1给出的是一些相关的文档，用于查找与之类似的文档。都有一些网络链接，感兴趣的可以打开看一下，还是有一定的意义的。

而在下面的就解释了目录中每个子部分的作用，原文如下：

Chapter 2, Software Application Development Flows, describes software application development,
beginning with an overview of the Xilinx-provided tools for developing and debugging applications
for Zynq-7000 EPP devices. The chapter also provides the typical steps to develop bare-metal
applications (using the Xilinx SDK tool), and lists the typical steps to develop an embedded Linux
application.
Chapter 3, Boot and Configuration, describes the boot process for Zynq-7000 EPP devices. It details
the three possible boot modes, then documents the two boot stages. This chapter also covers how
to create a boot image and how to program a flash device.
Chapter 4, Linux provides an overview of using Git and the Xilinx public Git server, a diagram of the
Linux Kernel, and a description of U-Boot, and provides links for more information on these topics.
Appendix A, Additional Resources, lists all relevant documentation, and provides links to that
documentation (where available).

第二部分介绍了软件开发环境SDK

第三部分介绍了boot以及相关的配置

第四部分积少了linux的嵌入方法

末尾则是一些拓展资源。

1.2则是介绍如何选择操作系统的相关功能，AMP和SMP是否要使用。

3、其他部分的细节

看如下文案：

The Zynq-7000 EPP software application development flows let you create software applications
using a unified set of Xilinx tools, and leverage a broad range of tools offered by third-party
vendors for the ARM Cortex-A9 processors.
This chapter focuses on Xilinx tools and flows; however, the concepts are generally applicable to
third-party tools, and the Zynq-7000 EPP solutions incorporate familiar components such as an
Eclipse-based integrated development environment (IDE) and the GNU compiler toolchain.
This chapter also provides an overview of bare-metal and Linux software application development
flows using Xilinx tools, which mirror support available for other Xilinx embedded processors, with
differences as noted. This chapter also references boot, device configuration, and OS usage within
the context of application development flows. Those topics are covered in-depth in other chapters
and references to other material.

再看一下机械翻译：

Zynq-7000 EPP软件应用程序开发流程允许您创建软件应用程序
使用一套统一的Xilinx工具，并利用第三方提供的广泛工具
ARM Cortex-A9处理器供应商。
本章重点介绍Xilinx工具和流程;然而，这些概念一般适用于
第三方工具和Zynq-7000 EPP解决方案包含了一些熟悉的组件，如an
基于eclipse的集成开发环境(IDE)和GNU编译器工具链。
本章还概述了bare-metal和Linux软件应用程序开发
使用Xilinx工具的流，该工具的镜像支持可用于其他Xilinx嵌入式处理器
如上所述的差异。本章还将介绍其中的引导、设备配置和操作系统使用
应用程序开发流程的上下文。这些主题将在其他章节中深入讨论
以及对其他材料的参考。

是不是可以读出个大概。

再看一段文字

You can boot or configure Zynq-7000 EPP devices in secure mode using static memories only
(JTAG disabled) or in non-secure mode using either JTAG or static memories.
• JTAG mode is primarily used for development and debug.
• NAND, parallel NOR, Serial NOR (Quad-SPI), and Secure Digital (SD) flash memories are used for
booting the device. The details of these boot modes are described in the Zynq-7000 EPP
Technical Reference Manual (UG585).
Processor system boot is a two-stage process:
• An internal BootROM stores the stage-0 boot code, which configures one of the ARM
processors and the necessary peripherals to start fetching the First Stage Bootloader (FSBL)
boot code from one of the boot devices. The programmable logic (PL) is not configured by the
BootROM. The BootROM is not writable.
• The FSBL boot code is typically stored in one of the flash memories, or can be downloaded
through JTAG. BootROM code copies the FSBL boot code from the chosen flash memory to
On-Chip Memory (OCM). The size of the FSBL loaded into OCM is limited to 192 kilobyte. The
full 256 kilobyte is available after the FSBL begins executing when the remaining 64 kilobyte is
no longer reserved.

大概地看也能知道基本的意思

只能使用静态内存在安全模式下启动或配置Zynq-7000 EPP设备
(禁用JTAG)或在非安全模式下使用JTAG或静态内存。
JTAG模式主要用于开发和调试。
•使用NAND、parallel NOR、Serial NOR (quadi - spi)和Secure Digital (SD)闪存
启动设备。这些引导模式的细节在Zynq-7000 EPP中进行了描述
技术参考手册(UG585)。
处理器系统启动是一个两阶段的过程:
•内部BootROM存储stage-0引导代码，用于配置其中一个ARM
开始获取第一阶段引导加载程序(FSBL)所需的处理器和外围设备
从一个引导设备引导代码。可编程逻辑(PL)不是由
BootROM。BootROM是不可写的。
•FSBL引导代码通常存储在一个闪存中，或者可以下载
通过JTAG。BootROM代码将FSBL引导代码从所选的闪存复制到
片上内存(OCM)。装载到OCM的FSBL的大小被限制为192kb。的
当FSBL开始执行后，剩余的64千字节可用时，才有完整的256千字节可用
不再保留。

基本能够理解大概的意思，建议将出现两次以上的词查词典以方便以后阅读。

总之，这是一个不断积累的过程。阅读，读出大意是起点，灵活应用是终章。