COM iMX25 Bootloader U-Boot

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FAQ

Downloads

Console commands

NAND Flash

Nand Flash Read
nand read <SDRAM address> <NAND Flash address> <Bytes>
Example: nand read 80000000 400000 b40000
Description: Copies 11,25MByte from NAND Flash address 0x40_0000 to SDRAM address 0x8000_0000
Nand Flash Erase
nand erase <Block base address> <Bytes>
Example: nand erase 400000 40000
Description: Deletes NAND Flash content from address 0x40_0000 to 0x43_FFFF
Note: The Bytes information needs to be block size aligned!
Nand Flash Write
nand write <SDRAM address> <NAND Flash address> <Bytes>
Example: nand write 80000000 400000 b40000
Description: Cpoies 11,25MByte from SDRAM address 0x8000_0000 to NAND Flash address 0x40_0000
Note: The Bytes information needs to be page size aligned!
Show bad NAND Flash blocks
nand bad
Description: Shows the bad NAND Flash blocks.
Show NAND FLash content
nand dump <NAND Flash address>
Example: nand dump 400000
Description: Shows the content of the specified NAND Flash block

LCD contoller

Show LCD controller settings
lcdinfo
Example:
 Display Resolution: 800 x 480 pixels
 Display Type:       Active Color Display
 Pixel Clock:        22 MHz
 Bits per Pixel:     16 Bits/Pixel
 Pixel Polarity:     Active High
 VSYNC Polarity:     Active Low
 HSYNC Polarity:     Active Low
 Clock Polarity:     Pos. Edge
 Output En Polarity: Active High
 HSYNC Puls Width:   64 Clock Cycles
 HSYNC Back Porch:   86 Clock Cycles
 HSYNC Front Porch:  42 Clock Cycles
 VSYNC Puls Width:   2 Line Cycles
 VSYNC Back Porch:   33 Line Cycles
 VSYNC Front Porch:  10 Line Cycles

GPIO's

Show DHCOM GPIO settings
gpioinfo
Example:
 GPIO_A: Direction = Input
         State     = 0
 GPIO_B: Direction = Input
         State     = 0
 GPIO_C: Direction = Input
         State     = 0
 GPIO_D: Direction = Input
         State     = 0
 GPIO_E: Direction = Input
         State     = 1
 GPIO_F: Direction = Input
         State     = 1
 GPIO_G: Direction = Output
         State     = 1
 GPIO_H: Direction = Input
         State     = 1
 GPIO_I: Direction = Input
         State     = 1
 GPIO_J: Direction = Input
         State     = 1
 GPIO_K: Direction = Input
         State     = 0

SD/MMC Card

Switch between MicroSD and SD Slot
mmcswitch <Slot number>
Example: mmcswitch 2
Description: Switch between SD/MMC Slots: 1 --> SD/MMC Slot, 2 --> MicroSD Slot
Initialize SD/MMC Card
mmcinit
Description: Initialize new inserted SD Card

Filesystem

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>
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>
Example 1: fatload mmc 1 80100000 nk.gz
Example 2: fatload mmc 1 80100000 /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"
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 1 0
Description: Shows PHY control register content.

Environment

Show ENV variables
printenv
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
setenv <ENV name> <ENV value>
Example: setenv 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
saveenv

Update

Note: See also Bootloader subitem Flash Update.
iMX25_update.bmp file
update
Description: Starts Flash update with "iMX25_update.bmp" file.
Command line
update <type> [filename]
Type:
wince = WinCE image update (default file names nk.gz or nk.bin) + ENV update
linux = Linux image update (default file name uImage) + ENV update (default script file name uImage.env)
flash = Complete flash image update
bootloader = Bootloader update (default file name u-boot.bin)
splash = Bootbitmap update (default file name splash.bmp)
settings = Settings block update (default file name settings.bin)

I2C

List available devices
i2c probe
Valid chip addresses: 00 57 6F
0x5F = DHCOM i.MX25 Core Module EEPROM
0x6F = DHCOM i.MX25 Core Module Real Time Clock
Read
i2c md <I2C address> <I2C register> <Bytes>
Example: i2c md 57 0 10
Description: Reads 10 Bytes from the offset 0.
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.

OS Boot

WinCE
bootwince <Image address> [debug]
Example: bootwince 200000
Description: The address 0x20_0000 specifies NAND Flash image address. The image is loaded from NAND flash to SDRAM. Next to that u-boot starts WinCE. The "debug" option make sure that the image wouldn't be started after uncompressing.
Note: The Image address could also be an SDRAM address. But it is necessary to copy the Image (via tftp or nand flash commands) to the SDRAM before calling "bootwince".
bootwince tftp
Note: The ENV variables "loadaddr" and "bootfile" needs to be set before calling the command. For *.gz image types the "loadaddr" should be set to 0x8290_0000 and for *.bin images the address should be 0x8100_0000.
Linux
bootm <Kernel address> [arg]
Note: When booting a Linux kernel,‘arg' can be the address of an initrd image.

Unzip

unzip <source address> <destination address>
Example: unzip 82900000 80100000
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]

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>

Hardware settings

The Hardware settings could be configured via the DHCOM settings file in flash memory. The file contains the following settings:

(Supported from U-Boot v1.11.0.1 or higher)

Settings Block description:

Settings Name: Description: Unit:
VALIDATION_ID „DH“
DISPLAY_ID unique ID of Display
LENGTH Length of the settings block
X_RESOLUTION Display x resolution pixel
Y_RESOLUTION Display y resolution pixel
PIXEL_CLOCK Pixel clock kHz
LCD_CONFIG_REG LCD Configuration Register see description
HSW Horizontal synchronization pulse width pixel clocks
VSW Vertical synchronisation pulse width line clocks
HFP Horizontal front porch pixel clocks
HBP Horizontal back porch pixel clocks
VFP Vertical front porch line clocks
VBP Vertical back porch line clocks
DATALINES count of datalines number of datalines
ACB AC Bias frequency
ACBI AC Bias transitions per interrupt
GPIO_DIR DHCOM GPIO default direction register see description
GPIO_STATE DHCOM GPIO default state register see description
HW_CONFIG_REG Hardware Configuration Register see description

LCD_CONFIG_FLAGS description:

Settings Name: Description: Unit:
IVS Inverted Vertical Sync Pulse 0 active high / 1 active low
IHS Inverted Horizontal Sync 0 active high / 1 active low
IPC Inverted Pixel Clock 0 Data is driven on rising edge / 1 Data is driven on falling edge
IOE Inverted Output Enable 0 active high / 1 active low
IDATA Inverted Data 0 active high / 1 active low
ACT_PAS Active or passiv matrix display 0 passiv / 1active
PWM_POL PWM polarity 0 low state backlight off and high state backlight on / 1 low state backlight on and high state backlight off
BL_EN_GPIO Backlight enable GPIO number 0 no backlight enable GPIO / 1 DHCOM GPIO_A / 2 DHCOM GPIO_B / … / 9 = DHCOM GPIO_I
IBL Inverted Backlight Enable 0 active high / 1 active low

GPIO_DIR description:

Settings Name: Description: Unit:
GPIO_A_DIR DHCOM GPIO_A direction 1 input / 0 output
GPIO_B_DIR DHCOM GPIO_B direction 1 input / 0 output
…
GPIO_I_DIR DHCOM GPIO_I direction 1 input / 0 output

GPIO_STATE description:

Settings Name: Description: Unit:
GPIO_A_STATE DHCOM GPIO_A default state if dir = output 1 high / 0 low
GPIO_B_STATE DHCOM GPIO_B default state if dir = output 1 high / 0 low
…
GPIO_I_STATE DHCOM GPIO_I default state if dir = output 1 high / 0 low

HW_CONFIG_FLAGS description:

Settings Name: Description: Unit:
SILENT_MODE Disable Bootloader messages on FFUART 0 enabled FFUART outputs / 1 disabled FFUART outputs
UPDATE_DEV Configures auto update storage devices 0b000000 All Update Medias disabled

0bxxxxx1 Update via MicroSD Slot

0bxxxx1x Update via SD/MMC Slot

0bxxx1xx Update via USB Host 1

0bxx1xxx Update via USB OTG

0bx1xxxx Update via USB Host 2

0b1xxxxx Update via Ethernet

LCD_MODE Enable Bootloader messages on LCD Display 1 enabled / 1 disabled

Flash Update

The follwing updates are possible with the Bootloader:

  1. Bootloader
  2. Splashimage
  3. Settings
  4. Linux image
  5. WinCE image

Overview

Modes

Automatically Update

(Supported from U-Boot v1.10.0.0 or higher)
Is called after the start of the bootloader. The functionality tries to update the flash content via the DHupdate.ini file (Please have a look at DHupdate.ini file). The update mechanism is searching for the update files on the specified storage devices. The update devices must be defined at the settings block (Please have a look at Hardware settings). With the DHupdate.ini file you have the possibility to run more then one updates, e.g. OS image and settings block.

Command line Update

  1. Instruction: "update"
    (Supported from U-Boot v1.10.0.0 or higher)
    The functionality tries to update the flash content via the DHupdate.ini file. In contrast to Automatically Update the update mechanism is searching on every available storage device for the update files.
  2. Instruction: "update <type> [filename]"
    (Supported from U-Boot v1.5.0.0 or higher)
    The functionality doesn't use the DHupdate.ini file. It allows only one update and the update mechanism is searching on every available storage device for the update files. With the <type> parameter you have to specify the update type.
    The <type> parameter could be specified as follows:
    • wince = WinCE image update + ENV update
    • linux = Linux image update + ENV update
    Note: If you run linux update, u-boot searches also for an update ENV script. This script modifies the ENV for Linux. The name of the script must be the image name with the ending .env. You can also run an update without an script file. In this case u-boot only updates the image and the ENV remains unchanged.
    • bootloader = Bootloader update
    Note: The ENV in Flash memory is created on the first start of u-boot. If you run a bootloader update and the ENV at the new bootloader has changed, the ENV in Flash memory remains unchanged with the bootloader update. But you could delete the ENV block in flash memory before the update, then u-boot will create the new default ENV at the next start after the bootloader update.
    • splash = Bootbitmap update
    • settings = Settings block update
    Note: Please have a look at Hardware settings.
    The [filename] parameter could be used to specify a non default filename. The default filenames are:
    • wince = default file names nk.gz or nk.bin
    • linux = default file name uImage + default script file name uImage.env
    • bootloader = default file name u-boot.bin
    • splash = default file name splash.bmp
    • settings = default file name settings.bin

DHupdate.ini file

The DHupdate.ini file is a text file, which describes the user specified update mechanism.


For DHupdate.ini File Example, please have a look at the Please have a look at Download area.
Note: It is necessary to use UNIX End Of Line conversion!!!
Update progress LED description:
The LED GPIO is activated as soon as update has started. This takes roughly 6 - 8 seconds. If the update was finished without an error, the LED GPIO is deactivated. If an error occurs during the update the LED GPIO begins blinking.
LED error code:
1 LED blinking interval = DHupdate.ini File error (Wrong file content or no valid file found)
2 LED blinking interval = Necessary File for Update not found
3 LED blinking interval = Flash write or erase error
4 LED blinking interval = Wrong OS Image type (e.g. no WinCE *.gz or *.bin file)
5 LED blinking interval = Specified file not valid (e.g. linux *.env file)
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