Difference between revisions of "Motorola Droid 4"

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Make sure there is a SIM in the phone.
Make sure there is a SIM in the phone.

Run this over SSH:
Run this:

Read modem output:
Read modem output:
cat /dev/motmdm1 &
# cat /dev/motmdm1 &

Online modem:
Online modem:
# printf "AT+CFUN=1\r" > /dev/motmdm1
printf "AT+CFUN=1\r" > /dev/motmdm1

Connect to network:
Connect to network:
# printf "AT+COPS=1\r" > /dev/motmdm1
printf "AT+COPS=1\r" > /dev/motmdm1

Print connected network:
Print connected network:
printf "AT+COPS?\r" > /dev/motmdm1

# printf "AT+COPS?\r" > /dev/motmdm1
Turn off signal reporting:
Not sure, do it anyway:
# printf "AT+SCRN=0\r" > /dev/motmdm1
# printf "AT+SCRN=0\r" > /dev/motmdm1

Dial a number:
Dial a number:
# printf "ATD+1234567890\r" > /dev/motmdm1
printf "ATD+1234567890\r" > /dev/motmdm1

Hang up:
Hang up:
# printf "ATH\r" > /dev/motmdm1
printf "ATH\r" > /dev/motmdm1

Answer incoming call:
Answer incoming call:
# printf "ATA\r" > /dev/motmdm1
printf "ATA\r" > /dev/motmdm1

Revision as of 20:33, 31 March 2021

Motorola Droid 4
Motorola Droid 4 - Leste pre-alpha.jpg
Manufacturer Motorola
Codename Maserati
Dimensions 127x67.3x12.7mm
Release Date 2012-02-10
Hardware Features
LCD 960x540 4"
Video PowerVR SGX540
Storage 16GB flash
Sensors AK8975 compass, LIS3DH accelerometer, ISL29030 proximity and illuminance, TMP105 temperature sensor
Software Features


Feature Leste supported Notes
Kernel version 5.9.0 Mainline + some patches not yet in mainline - see https://github.com/maemo-leste/droid4-linux
Serial Yes On MicroUSB port, requires special cable
Charging Yes
Wireless Yes
Ethernet N/A
Micro USB Yes OTG and USB network
Keyboard Yes Slightly modified keyboard layout, see https://www.spinics.net/lists/linux-omap/msg135137.html (TLDR; Shift key produces CTRL, SYM produces ALT, and Caps lock produces SHIFT)
Screen Yes
3D Acceleration Yes PowerVR SGX540 (closed driver) - https://github.com/maemo-leste/pvr-omap4/
Touchscreen Yes Capacitive
Audio Yes Implemented with Pulseaudio and UCM files
2G/3G data Yes Works with ofono, no UI yet - see https://github.com/maemo-leste/connui-cellular/
4G data No Needs kernel work
SMS Yes Works with ofono. Needs Leste UI
Phone calls Yes Works with ofono (good call quality, too), needs Leste UI
Bluetooth Yes Needs firmware - install latest firmware-ti-connectivity - See also https://github.com/maemo-leste/bugtracker/issues/290. Due to interference with WiFi, load driver manually, AFTER wifi module loaded
FM Transmitter No Apparently exists, and will need serdev kernel modules/drivers
FM Receiver Not yet
Accelerometer Yes Available in /sys, and as input device via iio-uinput
Compass Yes Available in /sys (after loading ak8975 module. No Leste integration applications using it yet)
Gyro N/A
Proximity sensor Yes
Ambient Light Sensor Yes
Vibration Motor Yes
HDMI-out Yes No UI integration
TV-out N/A
GPS Yes Works with gpsd but is not integrated yet, see GPS
Infrared N/A Missing in hardware
Camera No See https://elektranox.org/2018/02/0025-droid-camera/
Idle power consumption ~120mW Needs sim inserted


Hardware requirements:

  • Droid4 with fully charged battery
  • MicroUSB cable
  • MicroSD card

Software requirements:

  • Host Linux or Windows system
  • Android Tools: fastboot
  • Flashing tools:
    • XZ Utils and coreutils for Linux
    • Etcher[1] for Windows

Download from https://maedevu.maemo.org/images/droid4/

  1. VRZ_XT894_9.8.2O-72_VZW-18-8_CFC.xml.zip
  2. flash-droid-4-fw.sh
  3. Latest maemo-leste-1.0-armhf-droid4-*.img.xz

Download from https://github.com/tmlind/droid4-kexecboot.git

  1. utags-mmcblk1p13.bin
  2. droid4-kexecboot.img

Check what kernel version your Android OS runs. For this go to Settings -> About phone. Slide to the bottom, where you can see "Kernel version". If you have at least 3.0.8, you may skip "Updating Android" step below.


  1. Create a working directory with above mentioned files in it
  2. unzip VRZ_XT894_9.8.2O-72_VZW-18-8_CFC.xml.zip
  3. Power off Droid4 and connect it to the host machine with MicroUSB cable
  4. Start the device in fastboot mode. For this press power button and bottom volume key simultaneously and release them after a second.

Updating Android

This will reinstall the Android OS on your device, deleting all user data. Do a backup, if you want to save something. When everything is ready, go to the working directory mentioned above and run:

pushd VRZ_XT894_9.8.2O-72_VZW-18-8_CFC.xml
sudo bash ../flash-droid-4-fw.sh

Setting up kexecboot

Now, assuming you are in the working directory, install kexecboot:

sudo fastboot flash mbm VRZ_XT894_9.8.2O-72_VZW-18-8_CFC.xml/allow-mbmloader-flashing-mbm.bin
sudo fastboot reboot-bootloader
sudo fastboot flash bpsw droid4-kexecboot.img
sudo fastboot flash utags utags-mmcblk1p13.bin
sudo fastboot reboot

If you did "Updating Android" the device should run the firstboot steps. If you didn't, the device should reboot and show kexecboot menu for a few seconds before it boots to Android.

Install Maemo Leste to the sdcard

Now, flash the Maemo Leste image to your sdcard:

On Linux:

xzcat maemo-leste-1.0-armhf-droid4-20190227.img.xz | sudo dd status=progress bs=1M of=/dev/MICROSDCARD-DEVICE

On Windows: Use Etcher

Wait for sync to complete and insert MicroSD card into Droid4. Reboot the device and select Maemo Leste from the kexecboot menu.

You should now see Maemo Leste booting up, and it will show you hildon-desktop after a minute.


Normally you can just apt update && apt dist-upgrade to update to the latest version. If for some reason this fails:

  • Poweroff device, grab the SD card
  • Backup any important files
  • Grab the latest image from https://phoenix.maemo.org/view/Images/
  • Write it as before : xzcat maemo-leste-1.0-armhf-droid4-20190227.img.xz | sudo dd status=progress bs=1M of=/dev/MICROSDCARD-DEVICE


The battery in Droid4 is not easily removable. If you got the device stuck, use this combo: power button + bottom volume key. You should hold them for about 7 seconds. Droid4 will then reboot.

If Maemo is still running, you can also hold just the power button for ~10 seconds, and the device will run poweroff.

Some users reported that Bluetooth kernel module interfere badly with the WiFi driver on their devices. Blacklisting the module may help if you have such problems:

echo "blacklist hci_uart" >> /etc/modprobe.d/blacklist.conf

Also see Motorola_Droid_4/Modem Motorola_Droid_4/PowerVR

Also see: http://elektranox.org/droid4/ and http://muru.com/linux/d4/

Serial Cable

As explained at http://muru.com/linux/d4 , the Droid 4 exposes a serial console on the USB port. You can construct the required cable easily by following the instructions there. If you have old Nokia CA-42 or DKU-5 cables, then you can use them with the Droid 4, using instructions at https://jethomson.wordpress.com/2010/02/21/diy-usb-to-serial-cable-for-3usd/

While using the serial cable, if you lose the connection, the following may help:

18:43 < tmlind> sicelo: hmm the uart debug cable multiplexing still has issues, if the uart disappears during boot it should come back with 
                the console login propt later
18:45 < tmlind> try plugging in a pc usb cable then back to uart cable in case that might help

Stuff to try


Adding this in rc.local above the exit 0 gets you some blinkenlights to watschen und relaxen.

echo cpu > /sys/class/leds/lm3532::kbd_backlight/trigger # gets you a cpu activity monitor on the keyboard backlight
echo mmc0 > /sys/class/leds/shift-key-light/trigger      # gets you a 'hdd led' of the SD card on the capslock light


The WL1285C Wifi chip in the droid 4 has no onboard nvmem to save its calibration parameters or its MAC address. Instead it gets these parameters from a configuration file provided by the kernel. By default a generic file is provided but for optimal range and a correct persistent MAC address a calibration procedure must be performed.

Install necessary tools:

apt-get install ti-utils-wilink6 droid4-wlanconfig

Run calibration:

sudo maserati-calibrate

Phone Call

Make sure there is a SIM in the phone.

Run this:

Read modem output:

cat /dev/motmdm1 &

Online modem:

printf "AT+CFUN=1\r" > /dev/motmdm1

Connect to network:

printf "AT+COPS=1\r" > /dev/motmdm1

Print connected network:

printf "AT+COPS?\r" > /dev/motmdm1

Turn off signal reporting:

# printf "AT+SCRN=0\r" > /dev/motmdm1

Dial a number:

printf "ATD+1234567890\r" > /dev/motmdm1

Hang up:

printf "ATH\r" > /dev/motmdm1

Answer incoming call:

printf "ATA\r" > /dev/motmdm1

Audio wise, in a pulsaudio of you choice switch to the make a phone call profile, and set the output device as desired.

3G Internet

Using qmicli:

  1. qmicli -d /dev/cdc-wdm0 --wds-follow-network --wds-start-network=apn=internet.t-mobile.cz
  2. route del default
  3. sudo ifconfig wwan0 up
  4. dhclient wwan0

Alternatively if updated to devel icd2 and the maemo gui should allow 3g data connection, if the sim is unlocked and the relevant packages are installed.


modprobe gnss-motmdm and point gpsd to use /dev/gnss0

22:30 < tmlind> hmm there's a probably kernel gnss bug for gsp access fyi, you can currently only open one connection before you have to restart gpsd :)

Can try to

mkfifo /tmp/gps
cat /dev/gnss0 > /tmp/gps
Then point gpsd to use /tmp/gps


22:45 < tmlind> fyi, here's how to send USSD to query balance for example: printf "AT+CUSD=1,#999#,0\r" > /dev/motmdm1
22:47 < tmlind> fyi, for parsing incoming USSD, this web interface works if set to utf-8: 


Move output to external 1080p monitor. Disabling DSI-1 output gets xorg pointer displayed on HDMI, for use with a mouse or barrier.

xrandr --output HDMI-1 --mode 1920x1080 --output DSI-1 --off

Return to internal touchscreen display.

xrandr --output DSI-1 --auto --rotate right --output HDMI-1 --off

Keyboard / Mouse sharing with PC

To use droid4 while working at desktop it can be convenient to share mouse and keyboard of the host pc with droid4.

[https://github.com/debauchee/barrier Barrier software-KVM switch]

Developers and testers may wish to disable the googley bits before compiling.