Motorola Droid 4 (motorola-maserati): Difference between revisions
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Revision as of 18:42, 5 July 2019
WARNING: This device is not recommended for future use with postmarketOS due to its armhf architecture. Alpine Linux (the distribution that postmarketOS extends) pmaports#599 has been considering dropping it. The processor of the device may support the armv7 architecture. If so, you can modify the device package and change the architecture accordingly. |
![]() Motorola Droid 4 | |
Manufacturer | Motorola |
---|---|
Name | Droid 4 |
Codename | motorola-maserati |
Released | 2012 |
Hardware | |
Chipset | TI OMAP 4430 |
CPU | Dual-core 1.2 GHz Cortex-A9 |
GPU | PowerVR SGX540 |
Display | 540 x 960 TFT |
Storage | 16 GB |
Memory | 1 GB |
Architecture | armhf |
Software | |
Original software | Android 2.3 on Linux 2.6 |
postmarketOS | |
Category | testing |
Pre-built images | no |
Flashing |
No data |
---|---|
USB Networking |
Works |
Internal storage |
No data |
SD card |
No data |
Battery |
No data |
Screen |
Works |
Touchscreen |
Works |
Multimedia | |
3D Acceleration |
No data |
Audio |
No data |
Camera |
No data |
Camera Flash |
No data |
Connectivity | |
WiFi |
Works |
Bluetooth |
No data |
GPS |
No data |
NFC |
No data |
Modem | |
Calls |
No data |
SMS |
No data |
Mobile data |
No data |
Miscellaneous | |
FDE |
No data |
USB OTG |
No data |
HDMI/DP |
No data |
Sensors | |
Accelerometer |
No data |
Magnetometer |
No data |
Ambient Light |
No data |
Proximity |
No data |
Hall Effect |
No data |
Haptics |
No data |
Barometer |
No data |
Contributors
- TheKit
- Hexarei
- MartijnBraam
Rooting
The Droid 4 doesn't have an unlockable bootloader, so rooting the device requires an exploit.
The easiest exploit is called "Saferoot", which was originally intended for Samsung devices, but also works for many others, including the Droid 4. You can find a saferoot .zip file in this XDA-Developers thread:
https://forum.xda-developers.com/showthread.php?t=2565758
Download saferoot.zip, extract it somewhere, then enable USB debugging on the Droid 4 and connect it to your computer. With it connected, open a command line, cd to where you extracted the files, then run install.sh if you're on a Linux machine, or install.bat if you're on a Windows machine.
Following the on-screen instructions, you should eventually have a rooted device!
Custom Recovery: Safestrap
While there's no official version of TWRP for the maserati, there is a custom recovery based on early versions: SafeStrap!
YOU MUST ROOT AS LISTED ABOVE, FIRST!
You can download that here (make sure to get the one with maserati in the name!):
It's an APK file, so enable untrusted sources on your Droid 4 and install it. Once installed, if you're properly rooted, launching it should give you three options: Install recovery, uninstall recovery, and reboot to recovery.
Tapping "install recovery" should install the SafeStrap recovery! If it's successful, tapping "Reboot to recovery" should take you to the custom SafeStrap recovery.
Additional Info
Safestrap recovery has support for what it calls "ROM slots." At the time of this writing, you must select a non-stock slot in order to flash anything besides Android.
To repeat: DO NOT TRY TO INSTALL pmOS TO THE STOCK SLOT! IT COULD BRICK YOUR DEVICE!.
Installation
$ pmbootstrap.py init
$ pmbootstrap.py install
$ pmbootstrap.py export
Create ROM slot with minimal possible space for system, data, and cache partitions.
First flash CyanogenMod 11 to install files needed by SafeStrap for kexec.
$ wget "http://droid.cs.fau.de/cm-11.0/unofficial/cm-11-20160815-UNOFFICIAL-maserati.zip"
# Boot into safestrap recovery and go to Advanced -> ADB Sideload
$ adb sideload cm-11-20160815-UNOFFICIAL-maserati.zip
Then connect the phone via USB in SafeStrap and do the following (android-platform-tools need to be installed):
$ cd /tmp/postmarketOS-export
$ adb shell mount /system
# FIXME: you really want to backup original ramdisk.img and kernel here. At least for me Cyanogen no longer boots with modified ramdisk/kernel
$ adb push initramfs-motorola-maserati /system/etc/kexec/ramdisk.img
$ adb push vmlinuz-motorola-maserati /system/etc/kexec/kernel
$ adb shell
# In ADB shell (needed to make sure files are written before reboot):
$ umount /cache
$ umount /system
$ umount /data
$ losetup -d /dev/block/loop-cache
$ losetup -d /dev/block/loop-userdata
$ losetup -d /dev/block/loop-system
$ umount /ss
Now you can either flash motorola-maserati.img to sdcard or resize the image on host to desired size and replace userdata.img of ROM slot you created:
# FIXME: at least my resize2fs does not know about -s option; plus .img file contains partitions, not ext4 filesystem
$ resize2fs -s 2G motorola-maserati.img
$ adb shell mount /ss
$ export slot_number=1 # Number of SafeStrap slot used
$ adb push motorola-maserati.img /ss/safestrap/rom-slot${slot_number}/userdata.img
$ adb shell umount /ss
I have a brick! Help! (DANGEROUS)
So you accidentally overwrote the stock slot in SafeStrap. What should you do?
- Use Fastboot to write stock image back. Press the two volume buttons while pressing power to enter the factory bootloader. Find the files in VRZ_XT894_9.8.2O-72_VZW-18-8_CFC.xml.zip and rewrite system.img, boot.img, recovery.img, etc.
- Install kexecboot to mbm partition to avoid SafeStrap altogether and boot from SD card see droid4-kexecboot in the additional information.
Fastboot won't work due to too low a battery
- Charge battery with external LiPo charger - B+ and B- are clearly marked.
- Remove the battery, and insert pins into relevant battery terminals and give appropriate power from lab bench supply. Increasing current past a threshold (but be VERY careful) should fool the bootloader into thinking it has a well-charged battery.
- It may also be possible to charge via the rear 4-pin connector, which goes through the charging circuitry: https://forum.xda-developers.com/showthread.php?t=1887365
- Build a "factory cable" that bridges ID (micro-USB type-B pin 4) with 5V VCC (pin 1), which is how the factory flashes the devices without any battery at all.
See also
- #1039 WIP pull request
- KexecBoot for the Droid 4 - quite possibly more desirable than Safestrap