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Jolla C2 (jolla-c2)

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Reeder Jolla C2
Jolla C2 community phone
Jolla C2 community phone
Manufacturer Reeder
Name Jolla C2
Codename jolla-c2
Released 2024
Type handset
Hardware
Chipset Unisoc Tiger T606 (UMS9230)
CPU 2x 1.6 GHz Cortex-A75
6x 1.6 GHz Cortex-A55
GPU Mali-G57
Display 720 x 1600 LCD
Storage 128 GB
Memory 8 GB
Architecture aarch64
Software
Original software
The software and version the device was shipped with.
Sailfish 5.0
Extended version
The most recent supported version from the manufacturer.
Sailfish
FOSS bootloader no
postmarketOS
Category testing
Mainline
Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.
yes
Unixbench score
Unixbench Whetstone/Dhrystone score. See Unixbench.
4324.4
Device package device-jolla-c2
Kernel package linux-postmarketos-unisoc-ums9230
Features
Flashing
It is possible to flash the device with pmbootstrap flasher.
Partial
USB Networking
After connecting the device with USB to your PC, you can connect to it via telnet (initramfs) or SSH (booted system).
Works
Internal storage
eMMC, SD cards, UFS, ...
Works
SD card
Also includes other external storage cards
Works
Battery
Charging and battery level reporting works
Works
Screen
Display works. Ideally with sleep mode and brightness control.
Works
Touchscreen
Works
Multimedia
3D Acceleration
Works
Audio
Audio playback, microphone, headset and buttons.
Partial
Camera
Broken
Camera Flash
Works
Connectivity
WiFi
Partial
Bluetooth
Works
GPS
Broken
Modem
Calls
Broken
SMS
Broken
Mobile data
Broken
Miscellaneous
FDE
Full disk encryption and unlocking with unl0kr.
Untested
USB OTG
USB On-The-Go or USB-C Role switching
Partial
Sensors
Accelerometer
Auto screen rotation works in desktops e.g. Phosh or Plasma Mobile
Broken
Magnetometer
Sensor to measure magnetism
Broken
Ambient Light
Broken
Proximity
Broken
Hall Effect
Also known as flip cover sensor
Untested
Haptics
Works
Barometer
Sensor to measure air pressure
Untested
Power Sensor
Sensor to monitor current, voltage and power. Not fuel gauge!
Untested
U-Boot
Primary Bootloader
It is possible to replace stock bootloader with U-Boot.
Broken
Secondary Bootloader
It is possible to chainload U-Boot from stock bootloader.
Works
Mainline
Latest versions of U-Boot are not broken and it is possible to use them.
Broken
Internal Storage
It is possible to boot from internal storage (e.g. eMMC or UFS).
Works
SD card
It is possible to boot from SD card.
Works
USB Host
It is possible to boot from a USB storage or connect a keyboard.
Broken
USB Peripheral
It is possible to use device as a peripheral in U-Boot, e.g. for fastboot mode.
Broken
Display
Works
Keyboard
Broken
Buttons
It is possible to navigate in boot menu or grub with volume and power buttons.
Broken

The Jolla C2 community phone is a Jolla-branded version of the Reeder S19 Max Pro S.

Contributors

Users owning this device


Features

Modem

The modem works with a modified version of oFono from Sailfish OS: https://github.com/affenull2345/ofono/tree/unisoc. ModemManager is not supported yet.

Camera

A libcamera fork is available here: https://codeberg.org/ums9230-mainline/libcamera

How to enter flash mode

Fastboot mode

With the phone powered off, hold the power key until the phone vibrates, then press the volume down key.

Unisoc emergency flash mode

Power on or reboot the phone with the volume up key held and connect with a flashing tool.

See https://sailfishos.wiki/books/jolla-c2/page/flashing-the-jolla-c2-using-the-unisoc-flash-mode for more information.

Installation

Backing up the Sailfish OS boot image

Enable developer mode on Sailfish OS and copy /boot/hybris-boot.img from the phone using SSH.

Using pmbootstrap

Follow Installation/Using pmbootstrap and install to an SD card. When asked for the device's vendor/codename, select jolla as the vendor and c2 as the codename.

To boot the device from the SD card:

  • Enter fastboot mode (see #How to enter flash mode)
  • Run pmbootstrap flasher flash_kernel to flash a boot image containing U-boot as a secondary bootloader
  • Run fastboot reboot

pmbootstrap flasher flash_rootfs is not recommended as it will overwrite the preinstalled Sailfish OS, requiring a complete reinstallation (not documented here).

Reflashing the primary bootloader

To allow booting other processors such as the modem, some secure boot restrictions need to be disabled in the firmware. This can be done by running the following commands on the first boot:

# dd if=/boot/u-boot-spl-16k-ufs-sign.bin of=/dev/sdb bs=8192
# dd if=/boot/u-boot-spl-16k-ufs-sign.bin of=/dev/sdc bs=8192

Booting Sailfish OS

To boot Sailfish OS again, enter fastboot mode and run:

$ fastboot flash boot_a hybris-boot.img
$ fastboot reboot

See also