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i.MX BSP Porting Guide

Document Number: IMXBSPPG

Rev. L4.9.88_2.0.0-ga, 05/2018

Contents

Section number Title Page

Chapter 1

Introduction

1.1 Introduction.....................................................................................................................................................................7

1.2 References.......................................................................................................................................................................7

Chapter 2

Porting Kernel

2.1 Kernel overview..............................................................................................................................................................9

2.1.1 How to build and load Kernel in standalone environment.................................................................................9

2.1.2 How to build and load Kernel in Yocto Project.................................................................................................10

Chapter 3

Porting U-Boot

3.1 U-Boot overview.............................................................................................................................................................13

3.1.1 How to build U-Boot in standalone environment.............................................................................................. 13

3.1.2 How to build and load U-Boot in Yocto Project................................................................................................14

3.2 Customizing the i.MX custom board code..................................................................................................................... 15

3.2.1 Changing the DCD table for i.MX DDR initialization...................................................................................... 16

3.2.2 Booting with the modified U-Boot ................................................................................................................... 16

3.2.3 Adding new driver initialization code to board files..........................................................................................19

3.2.4 Further customization at system boot................................................................................................................ 19

3.2.5 Customizing the printed board name................................................................................................................. 20

3.3 Debugging.......................................................................................................................................................................20

3.3.1 Using JTAG tool for debugging.........................................................................................................................20

3.3.2 Using printf for debugging.................................................................................................................................21

Chapter 4

Configuring IOMUX Controller

4.1 IOMUX overview........................................................................................................................................................... 23

4.1.1 Information for setting IOMUX controller registers..........................................................................................23

4.1.2 Using IOMUX in the Device Tree - example....................................................................................................24

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Section number Title Page

Chapter 5

Registering a new UART Driver

5.1 UART overview..............................................................................................................................................................27

5.2 UART settings................................................................................................................................................................ 27

Chapter 6

Adding support for SDHC

6.1 SDHC overview..............................................................................................................................................................29

Chapter 7

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

7.1 SPI NOR overview......................................................................................................................................................... 31

7.1.1 Selecting SPI NOR on the Linux image............................................................................................................ 31

7.1.2 Changing the SPI interface configuration..........................................................................................................32

7.1.3 Hardware operation............................................................................................................................................32

Chapter 8

Connecting an LVDS Panel to an i.MX 6Quad/Solo/Dual/DualLite Reference Board

8.1 LVDS overview.............................................................................................................................................................. 33

8.1.1 Connecting an LVDS panel to the i.MX 6Dual/6Quad/6DualLite reference board..........................................33

8.2 Enabling an LVDS channel............................................................................................................................................ 33

8.3 LDB ports........................................................................................................................................................................34

8.3.1 Input parallel display ports.................................................................................................................................35

8.3.2 Output LVDS ports............................................................................................................................................ 36

8.4 Additional information....................................................................................................................................................36

Chapter 9

Supporting the i.MX 6 Quad/Solo/Dual/DualLite Camera Censor with CSI

9.1 CSI overview.................................................................................................................................................................. 37

9.1.1 Required software ............................................................................................................................................. 37

9.1.2 i.MX 6Dual/6Quad/6Solo/6DualLite CSI interfaces layout..............................................................................38

9.1.3 Configuring the CSI unit in test mode............................................................................................................... 38

9.2 Adding support for a new CMOS camera sensor........................................................................................................... 39

9.2.1 Adding a camera sensor entry in Kconfig..........................................................................................................39

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Section number Title Page

9.2.2 Creating the camera sensor file..........................................................................................................................40

9.2.3 Adding a compilation flag for the new camera..................................................................................................42

9.3 Using the I2C interface................................................................................................................................................... 43

9.3.1 Loading and testing the camera module............................................................................................................ 45

9.4 Additional reference information....................................................................................................................................45

9.4.1 CMOS interfaces supported by the i.MX 6Dual/6Quad/6Solo/6DualLite........................................................ 45

9.4.2 i.MX 6Dual/6Quad/6Solo/6DualLite CSI parallel interface..............................................................................47

9.4.3 Timing data mode protocols.............................................................................................................................. 49

Chapter 10

Porting Audio Codecs to a Custom Board

10.1 Audio overview...............................................................................................................................................................51

10.1.1 Common porting task.........................................................................................................................................51

10.1.2 Porting the reference BSP to a custom board (audio codec is the same as in the reference design)................. 52

10.1.3 Porting the reference BSP to a custom board (audio codec is different from the reference design)................. 53

Chapter 11

Porting the Ethernet Controller Driver

11.1 Ethernet controller overview...........................................................................................................................................55

11.1.1 Pin configuration................................................................................................................................................55

11.1.2 Ethernet configuration........................................................................................................................................56

Chapter 12

Porting USB Host1 and USB OTG

12.1 USB overview for i.MX 6Dual/6Quad/6Solo/6DualLite/6UltraLite/7Dual...................................................................59

12.2 USB overview for i.MX 6SoloLite/6SoloX....................................................................................................................61

12.3 USB overview for i.MX 8MQuad.................................................................................................................................. 62

Chapter 13

Revision History

13.1 Revision History............................................................................................................................................................. 65

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