Datasheet

Chapter 6

Boot

6.1 Boot from SD3

6.1.1 Boot from SD3 on SCM i.MX6DQ QWKS REVC (rev3)/REV

B (rev2) Board

Below are the Boot Switch setting to control the boot storage:

download Mode (MFGTool mode)

(SW3)/(SW1) 11001001 (from 1-8 bit)

SD3 boot (SW3)/(SW1) 10101001 (from 1-8 bit)

HDMI is the default display on QWKS. To change to ldb as the main display you can use the following settings on uboot

U-Boot > setenv bootargs console=ttymxc0,115200 init=/init

video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off

vmalloc=256M androidboot.console=ttymxc0 consoleblank=0

androidboot.hardware=freescale cma=384M [Optional]

U-Boot > saveenv [Save the environments]

6.1.2

Boot from SD3 on SCM i.MX6SX EVB Board

Below are the Boot Switch setting to control the boot storage:

download Mode(MFGTool mode)

(S1) 10 (from 1-2 bit)

SD3 boot

(S1) 01 (from 1-2 bit)

(SW2) 00000000 (from 1-10 bit)

(SW3) 00110000 (from 1-4 bit)

(SW4) 01000010 (from 1-4 bit)

6.2 Boot Up configurations

This section explains the common u-boot environments we used for NFS, MMC/SD boot above, and also kernel command

line we may have changed for different usage scenarios.

6.2.1

U-Boot environment

• ethaddr/fec_addr: MAC address of your board

• serverip: IP address of your TFTP/NFS server

• loadaddr/rd_loadaddr: the kernel/initramfs image load address in memory

• bootfile: the name of image file loaded by "dhcp" command, when you using TFTP to load kernel.

• bootcmd: the first variable to run after uboot boot

Boot

SCM i.MX 6 Series Android User's Guide

NXP Semiconductors