COM iMX6 Bootloader U-Boot

Enter Bootloader Console

1. Connect DHCOM UART1 (FF UART) via null modem cable to the RS232 Port of your PC
2. Start terminal program (e.g. Tera Term) on the Host PC with the following settings:

   Baud rate: 115200

   Data: 8 bit

   Parity: none

   Stop bits: 1 bit

   Flow control: none

3. Press "del" on the Host PC during Core Module system start to enter bootloader console

U-boot console commands

SPI Flash

SPI Flash Init

sf probe

Example: sf probe

Description: Initializes the OnBoard SPI Flash

SPI Flash Read

sf read <SDRAM address> <SPI Flash address> <Bytes>

Example: sf read 10000000 0 100

Description: Copies 256Bytes from SPI Flash address 0x0 to SDRAM address 0x1000_0000

SPI Flash Write

sf write <SDRAM address> <SPI Flash address> <Bytes>

Example: sf write 10000000 40000 10000

Description: Copies 64kByte from SDRAM address 0x1000_0000 to SPI Flash address 0x4_0000

SPI Flash Erase

sf erase <SPI Flash address> <Bytes>

Example: sf erase 100000 1000

Description: Deletes SPI Flash content from address 0x10_0000 to 0x10_0FFF

Note: The Bytes information needs to be sector size aligned!

SD/MMC Card

Switch between MicroSD, SD Slot and eMMC

mmc dev <Slot number> <Partition number>

Example: mmc dev 0

Description: Switch between SD/MMC Slots: 0 --> SD/MMC Slot, 1 --> MicroSD Slot, 2 --> eMMC Flash

Note eMMC flash partition number: 0 --> User partition, 1 --> Boot partition 1, 2 --> Boot partition 2

Initialize SD/MMC Card

mmc rescan

Description: Initialize new inserted SD Card

Show SD/MMC information

mmcinfo

Description: Shows SD/MMC device information

Device: FSL_SDHC
Manufacturer ID: 45
OEM: 100
Name: SEM08
Tran Speed: 52000000
Rd Block Len: 512
MMC version 4.41
High Capacity: Yes
Capacity: 7.3 GiB
Bus Width: 8-bit

Write to MicroSD, SD Slot and eMMC

mmc write <SDRAM address> <block number> <block count>

Example: mmc write 11000000 5000 400

Description: Write 512kByte (device block size is 512Byte) to the eMMC offset 10MByte.

Read from MicroSD, SD Slot and eMMC

mmc read <SDRAM address> <block number> <block count>

Example: mmc read 11000000 5000 400

Description: Read 512kByte (device block size is 512Byte) from the eMMC offset 10MByte.

FAT - EXT2 - EXT4 - Filesystem

NOTE: All EXT2 commands must also be used for ext4

Show Filesystem information

fatinfo <interface> <device>

Example: fatinfo mmc 1

Interface: MMC
 Device 1: Vendor: Man 094150 Snr 266e068c Rev: 1.0 Prod: AF UD
           Type: Removable Hard Disk
           Capacity: 121.2 MB = 0.1 GB (248320 x 512)
 Partition 1: Filesystem: FAT16 "NO NAME    "

List files

fatls <interface> <device> <directory>

ext2ls <interface> <device> <directory>

Example 1: fatls mmc 1

Example 2: fatls mmc 1 /folder

Load Files from SD Card to SDRAM

fatload <interface> <device> <SDRAM address> <directory+filename>

ext2load <interface> <device> <SDRAM address> <directory+filename>

Example 1: fatload mmc 1 10100000 nk.gz

Example 2: fatload mmc 1 10100000 /folder/nk.gz

Ethernet

Load File via TFTP to SDRAM

tftp <SDRAM address> <directory+filename>

Example: tftp 80100000 nk.gz

Example TFTP Server: "Winagents TFTP Server Manager"

Note: For TFTP download it is necessary to config the ENV variables "ipaddr" and "serverip"

Load File via TFTP to SDRAM using DHCP

dhcp <SDRAM address> <directory+filename>

Example: dhcp 80100000 nk.gz

Example TFTP Server: "Winagents TFTP Server Manager"

Note: It is necessary to config the ENV variable "serverip" with the ip-address of your TFTP-Server

Ping

ping <IP address>

Example: ping 192.168.55.32

Read PHY register via MII interface

mii dump <PHY address> <PHY register>

Example: mii dump 0 0

Remark: The standard MII registers 0-5 are supported by this command. When you are working with a DHCOM i.MX6 module only PHY address "0" is allowed.

Unzip

unzip <source address> <destination address>

Example: unzip 12900000 10100000

Note: The unzip command is supporting the gzip file format.

Bitmap

Information

bmp info <Bitmap address>

Image size    : 800 x 480
Bits per pixel: 8
Compression   : 0

Display

bmp display <Bitmap SDRAM address> [x y]

Note: It is necessary to load bitmap file to memory address with an offset of an odd multiple of +2, since the use of a four-byte alignment will cause alignment exceptions at run-time.

Memory

Display

md[.b, .w, .l] <address> [count]

Example: md.b 80100000 100

Write

mw[.b, .w, .l] <address> <value> [count]

Example: mw.b 80100000 aa 100

Description: Writes the value 0xaa to the next 0x100 bytes from the address 0x8010_0000.

Copy

cp[.b, .w, .l] <source> <destination> <count>

Show DHCOM Settings

settings

Example:

 VALIDATION_ID:    "DH"
 DISPLAY_ID:       0x00
 LENGTH:           0x2c
 X_RESOLUTION:     800 pixel
 Y_RESOLUTION:     480 pixel
 PIXEL_CLOCK:      22200 kHz
 LCD_CONFIG_FLAGS: 0x3e3
 HSW:              64 pixel clocks
 VSW:              2 line clocks
 HFP:              42 pixel clocks
 HBP:              86 pixel clocks
 VFP:              10 line clocks
 VBP:              33 line clocks
 DATALINES:        16
 ACB:              0
 ACBI:             0
 GPIO_DIR:         0x01ff
 GPIO_STATE:       0x0000
 HW_CONFIG_FLAGS:  0x001e

I2C

List available devices

i2c probe

Valid devices:
0 = DHCOM I2C port 1
1 = DHCOM I2C port 2
2 = i.MX6 OnBoard I2C port

Read

i2c md <I2C address> <start address> <end address>

Example: i2c md 57 10 20

Description: Reads 16 Bytes from the address 0x10 to address 0x20.

Write

i2c mw <I2C address> <I2C register> <Value> <Bytes>

Example: i2c mw 57 0 aa 5

Description: Writes 0xaa to 5 Bytes from the offset 0.

Environment

Show ENV variables

env print

bootdelay=0
baudrate=38400
ipaddr=192.168.55.230
serverip=192.168.55.36
gatewayip=192.168.55.36
netmask=255.255.255.0
frias=5
kernel=uImage
bootargs=console=ttymxc0,115200 root=/dev/mmcblk0p2
nandbootwince=update;bootwince 00200000
splashimage=0x000c0000
save_ENV_to_flash=setenv ENVinFlash 1; saveenv
ENVinFlash=1
ethaddr=00:04:a3:34:b6:0d
ethact=FEC0
winceimagetype=nk.gz
winceimagesize=00ba55ee
loadaddr=00200000
bootcmd=run nandbootwince
filesize=212050
Environment size: 449/262140 bytes

Set ENV variables

env set <ENV name> <ENV value>

Example: env set ipaddr 192.168.55.2

Note: If you need to edit "bootcmd" it is necessary to insert ";" between the unique commands. You can enter ";" at the command line with "\;".

Save ENV variables

env save

Delete ENV variable

env delete <ENV name>

Revert to default ENV

env default -a

Import ENV from textfile

env import -t <SDRAM address> $filesize

Example:

fatload mmc 0 0x10000000 uEnv.txt

env import -t 0x10000000 $filesize

Important:

The uEnv.txt file should be in unix format. Also make sure that there is an empty line at the end of the file.

bootargs=console=ttyO0,115200n8 root=/dev/mmcblk0p2 mem=128M rootwait
bootcmd=mmc rescan; fatload mmc 0 0x82000000 uImage; bootm 0x82000000
uenvcmd=boot