Sony Xperia Z1 Compact (sony-amami)

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Sony Xperia Z1 Compact (Z1C)
Sony Xperia Z1C
Sony Xperia Z1C
Manufacturer Sony
Name Xperia Z1 Compact (Z1C)
Codename sony-amami
Released 2014
Original software Android 4.3 on Linux 3.4
Hardware
Chipset Qualcomm MSM8974 Snapdragon 800
CPU Quad-core 2.2 GHz Krait 400
GPU Adreno 330
Display 720x1280 IPS
Storage 16 GB
Memory 2 GB
Architecture armhf
Features
USB Networking
Works
Flashing
Works
Touchscreen
Works
Display
Works
WiFi
Works
Xwayland
Works
FDE
Mainline
Partial
Battery
3D Acceleration
Accelerometer
Audio
Bluetooth
Camera
GPS
Mobile data
SMS
Calls


Contributors

  • ata2001 (porting and testing)
  • ollieparanoid (help on IRC)
  • MartijnBraam (help on IRC)
  • robb4 (help on IRC)
  • lawl (help on IRC)
  • bshah (help on IRC)
  • mmaret (help on IRC)

Special keycombo's

  • Boot to recovery: hold volume down and power button till the phone shakes
  • Boot to bootloader: unplug device, hold volume up and plug usb into device
  • Reset if stuck: hold volume up and power button till the phone shakes

Issues

  • No splash in initramfs.
  • When USB charger plugged in when device is off, PostmarketOS "Loading..." screen is displayed continuously.

Building and Flashing

Follow Sony's instructions to unlock the bootloader.

./pmbootstrap.py init

User interface support (with current downstream kernel; might change when replaced with mainline kernel):

Build with FDE disabled (because, with FDE enabled, it looks like the device will just hang on boot at "Loading..." screen).

./pmbootstrap.py zap
./pmbootstrap.py install --no-fde

Before unlocking the bootloader, you might want to back up your TA partition, so that you could restore the device to more of a factory state (including DRM keys for a lot of proprietary enchantments to display and camera)

Before flashing, you must make sure that the bootloader is unlocked (or `flash_rootfs` will fail with "writing 'system'... FAILED"), which seems to require an IMEI-specific unlock code from Sony, which is sent to the device using `fastboot`: https://developer.sony.com/develop/open-devices/get-started/unlock-bootloader/how-to-unlock-bootloader/

To get the device into fastboot mode: power it off, remove USB cable, hold down Volume-Up while plugging in USB cable. The notification light bar at the top of the phone will very briefly flash red, and then turn blue. Then you can stop holding down Volume-Up, and the device should in fastboot mode.

./pmbootstrap.py flasher flash_rootfs
./pmbootstrap.py flasher flash_kernel

The `flash_rootfs` took about 1 minute, and `flash_kernel` took 5-10 seconds.

After flashing, you can unplug the USB cable, and the device will be off. Then hold down the power button for a second or few, to turn it on, like normally.

UI Usability

If you select `xfce4` UI when building, after you boot it, you can make it more usable on the small display by doing to menu item "Applications -> Settings -> Appearance", then selecting the "Fonts" tab, then adjusting the DPI up. If you can't press the tiny GUI buttons to adjust the DPI, you can first adjust the font size up (and if the scrollbar for the font size is too small, you can adjust it up in small increments).

Links