i.MX6Dual/6QuadBSPPortingGuide资源-CSDN文库

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### 知识点概览本文档是针对飞思卡尔（现恩智浦半导体）i.MX6DUAL和i.MX6QUAD芯片的BSP（Board Support Package）移植指南，文档编号为IMX6DQBSPPG Rev. L3.0.35_4.1.0，发布于2013年9月。本指南包含10个章节，详细介绍了从i.MX6参考板移植到i.MX6自定义板的整个过程，重点覆盖了U-Boot的移植、IOMUX控制器的配置、新的UART驱动注册、SDHC支持的添加、SPINOR驱动的配置以及如何将LVDS面板连接到i.MX6参考板。 ### 章节知识点详解 #### 第1章移植U-Boot 1. **U-Boot简介**：U-Boot是用于嵌入式设备的开源启动加载器，用于初始化硬件并加载操作系统。在本章节中，将介绍U-Boot的架构、功能及其在i.MX6 Dual/Quad系列中的作用。 2. **获取U-Boot源码**：讲解如何获取U-Boot的源代码，并对源码进行准备，以便用于自定义板。 3. **定制i.MX6自定义板代码**：包括改变DCD（Device Configuration Data）表用于DDR3初始化、使用修改后的U-Boot启动系统、添加新的驱动初始化代码到板级文件、系统启动时进一步定制和自定义打印的板名。 4. **调试技巧**：介绍如何使用RealView ICE和printf进行调试。 #### 第2章配置IOMUX控制器 1. **IOMUX概述**：IOMUX是一种硬件机制，允许同一个引脚可以用于不同的硬件功能，从而减少引脚的使用数量。本章节将解释IOMUX的基本概念。 2. **设置IOMUX控制器寄存器的信息**：提供设置IOMUX控制器寄存器的具体信息。 3. **在U-Boot和Linux中配置IOMUX**：详细说明如何定义引脚、配置IOMUX引脚用于初始化功能以及如何在Linux中配置IOMUX。 #### 第3章注册新的UART驱动 1. **UART概述**：通用异步收发传输器（UART）是一种计算机硬件设备，用于串行通信。本章节将讲解如何在i.MX6平台上配置UART。 2. **配置IOMUX上的UART引脚**：介绍如何在IOMUX上配置UART相关的引脚。 3. **在内核配置菜单中启用UART**：指导用户如何在内核配置中启用UART支持。 4. **测试UART**：提供测试UART连接的方法和步骤。 5. **文件名和位置**：说明UART驱动相关文件的名称和它们的存放位置。 #### 第4章添加SDHC支持 1. **SDHC概述**：SDHC（Secure Digital High Capacity）是SD卡的一种形式，用于提供更大的存储容量。本章节描述如何在i.MX6平台上添加SDHC支持。 #### 第5章配置SPINOR闪存技术设备（MTD）驱动 1. **SPINOR概述**：SPINOR是一种非易失性存储技术，常用于嵌入式设备的固件存储。本章节介绍如何配置SPINOR驱动。 2. **源码结构**：分析SPINOR驱动的源码结构和配置选项。 3. **选择SPINOR**：说明如何在Linux镜像中选择SPINOR支持。 4. **更改SPI接口配置**：详细讲解更改ECSPI接口、片选（Chip Select）以及外部信号的方法。 5. **硬件和软件操作**：分别介绍SPINOR的硬件和软件操作细节。 #### 第6章连接LVDS面板到i.MX6参考板 1. **LVDS概述**：LVDS（Low-Voltage Differential Signaling）是一种低电压差分信号技术，常用于高清晰度显示连接。本章节讲解如何将LVDS面板连接到i.MX6参考板。 2. **启用LVDS通道**：介绍如何在i.MX6参考板上启用LVDS通道。 3. **LDB端口**：详细说明LDB（LCD Display Bridge）端口的使用方法。以上章节均包含了对于移植、配置和调试i.MX6 Dual/Quad系列芯片所必需的关键知识。这份指南对于想要深入理解i.MX6系列芯片的硬件操作和软件配置的开发者来说，是一份宝贵的资源。通过遵循本指南的步骤，开发者可以有效地将i.MX6芯片与各种硬件模块集成，并进行相应的软件配置。

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i.MX 6Dual/6Quad BSP Porting Guide

Document Number: IMX6DQBSPPG

Rev L3.0.35_4.1.0, 09/2013

Contents

Section number Title Page

Chapter 1

Porting U-Boot from an i.MX 6Dual/6Quad Reference Board to an i.MX 6Dual/6Quad Custom Board

1.1 U-Boot Overview............................................................................................................................................................7

1.2 Obtaining the Source Code for the U-Boot.....................................................................................................................7

1.2.1 Preparing the Code...............................................................................................................................................7

1.3 Customizing the i.MX 6 Custom Board Code................................................................................................................9

1.3.1 Changing the DCD Table for i.MX 6 DDR3 Initialization..................................................................................10

1.3.2 Booting with the Modified U-Boot .....................................................................................................................10

1.3.3 Add New Driver Initialize Code to Board Files..................................................................................................11

1.3.4 Further Customization at System Boot................................................................................................................12

1.3.5 Customizing the Printed Board Name.................................................................................................................12

1.4 How to Debug.................................................................................................................................................................13

1.4.1 Use RealView ICE for Debugging.......................................................................................................................13

1.4.2 Use printf for debugging......................................................................................................................................13

Chapter 2

Configuring the IOMUX Controller

2.1 IOMUX Overview..........................................................................................................................................................15

2.2 Information for Setting IOMUX Controller Registers....................................................................................................15

2.3 Setting Up the IOMUX Controller and U-Boot..............................................................................................................16

2.3.1 Defining the Pads.................................................................................................................................................16

2.3.2 Configuring IOMUX Pins for Initialization Function.........................................................................................17

2.3.3 Example-Setting a GPIO......................................................................................................................................17

2.4 Setting Up the IOMUX Controller in Linux...................................................................................................................18

2.4.1 IOMUX Configuration Definition.......................................................................................................................18

2.4.2 Machine Layer File..............................................................................................................................................19

2.4.3 Example -Setting a GPIO.....................................................................................................................................20

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Section number Title Page

Chapter 3

Registering a New UART Driver

3.1 UART Overview.............................................................................................................................................................21

3.1.1 Configuring UART Pads on IOMUX..................................................................................................................21

3.1.2 Enabling UART on Kernel Menuconfig..............................................................................................................22

3.1.3 Testing the UART................................................................................................................................................22

3.1.4 File Names and Locations....................................................................................................................................22

Chapter 4

Adding Support for SDHC

4.1 SDHC Overview.............................................................................................................................................................25

Chapter 5

Configuring the SPI NOR Flash Memory Technology Device (MTD) Driver

5.1 SPI NOR Overview.........................................................................................................................................................27

5.2 Source code structure......................................................................................................................................................27

5.2.1 Configuration options..........................................................................................................................................27

5.2.2 Selecting SPI NOR on the Linux image..............................................................................................................28

5.3 Changing the SPI interface configuration.......................................................................................................................29

5.3.1 Changing the ECSPI Interface.............................................................................................................................29

5.3.2 Changing the Chip Select.....................................................................................................................................29

5.3.3 Changing the external signals..............................................................................................................................29

5.4 Hardware Operation........................................................................................................................................................29

5.4.1 Software Operation..............................................................................................................................................30

Chapter 6

Connecting an LVDS Panel to an i.MX 6 Reference Board

6.1 LVDS Overview.............................................................................................................................................................33

6.1.1 Connecting an LVDS Panel to the i.MX 6 Reference Board...............................................................................33

6.2 Enabling a LVDS Channel..............................................................................................................................................34

6.2.1 Locating Menu Configuration Options ...............................................................................................................34

6.3 LDB Ports.......................................................................................................................................................................35

6.3.1 Input Parallel Display Ports.................................................................................................................................36

i.MX 6Dual/6Quad BSP Porting Guide, Rev. L3.0.35_4.1.0, 09/2013

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Section number Title Page

6.3.2 Output LVDS Ports..............................................................................................................................................36

6.4 Further Reading..............................................................................................................................................................36

Chapter 7

Supporting the i.MX 6 Camera Sensor Interface CSI0

7.1 CSI Overview..................................................................................................................................................................39

7.1.1 Required Software ...............................................................................................................................................39

7.1.2 i.MX 6 CSI Interfaces Layout..............................................................................................................................40

7.1.3 Configuring the CSI Unit in Test Mode...............................................................................................................40

7.2 Adding Support for a New CMOS Camera Sensor........................................................................................................41

7.2.1 Adding a Camera Sensor Entry on the ltib Catalog (Kconfig)............................................................................41

7.2.2 Creating the Camera Sensor File.........................................................................................................................42

7.2.3 Adding a Compilation Flag for the New Camera................................................................................................44

7.3 Using the I2C Interface...................................................................................................................................................45

7.3.1 Loading and Testing the Camera Module............................................................................................................47

7.4 Additional Reference Information..................................................................................................................................48

7.4.1 CMOS Interfaces Supported by the i.MX 6Solo/6DualLite................................................................................48

7.4.2 i.MX 6 CSI Parallel Interface..............................................................................................................................50

7.4.3 Timing Data Mode Protocols...............................................................................................................................51

Chapter 8

Porting Audio Codecs to a Custom Board

8.1 Audio Overview..............................................................................................................................................................53

8.1.1 Common Porting Task.........................................................................................................................................53

8.1.2 Porting the Reference BSP to a Custom Board (audio codec is the same as in the reference design)................54

8.1.3 Porting the Reference BSP to a Custom Board (audio codec is different than the reference design).................54

Chapter 9

Porting the Fast Ethernet Controller Driver

9.1 FEC Overview................................................................................................................................................................57

9.1.1 Pin Configuration.................................................................................................................................................57

9.1.2 Source Code.........................................................................................................................................................58

9.1.3 Ethernet Configuration.........................................................................................................................................59

i.MX 6Dual/6Quad BSP Porting Guide, Rev. L3.0.35_4.1.0, 09/2013

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