Nokia 2720 Flip (nokia-beatles)

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Nokia 2720 Flip
Manufacturer Nokia
Name 2720 Flip
Codename nokia-beatles
Released 2019
Type feature phone
Hardware
Chipset Qualcomm Snapdragon 205 (MSM8905)
CPU 2x 1.1 GHz Cortex-A7
GPU Adreno 304
Display 240x320 TFT
Storage 4 GB
Memory 512 MB
Architecture armv7
Software
Original software KaiOS
Original version 2.5.2
postmarketOS
Category testing
Pre-built images no
postmarketOS kernel 3.10.49
Features
Flashing
Broken
USB Networking
Works
Internal storage
SD card
Battery
Screen
Works
Multimedia
3D Acceleration
Audio
Camera
Camera Flash
Connectivity
WiFi
Bluetooth
GPS
NFC
Modem
Calls
SMS
Mobile data
Miscellaneous
FDE
USB OTG
HDMI/DP
Sensors
Magnetometer
Ambient Light
Proximity
Hall Effect
Haptics
Barometer


Contributors

Users owning this device


Prerequisites

  • rooted phone
  • microSD card

Installation

Note The only method tested assumes flashing boot.img to the recovery partition and rootfs to the microSD card

fastboot reported to be locked on this phone, you will need to flash everything from the KaiOS directly instead:

  • install rootfs to the microSD with pmbootstrap install --sdcard=/dev/sdX
  • put the card into the phone and boot it to the KaiOS
  • export boot.img to the /tmp on your host machine: pmbootstrap export
  • push boot.img to the /sdcard: adb push /tmp/postmarketOS-export/boot.img-nokia-beatles /sdcard/
  • (optional) backup recovery partition: adb shell "dd if=/dev/block/bootdevice/by-name/recovery of=/sdcard/backup_recovery.img bs=2048"
  • flash recovery partition: adb shell "dd if=/sdcard/boot.img-nokia-beatles of=/dev/block/bootdevice/by-name/recovery bs=2048"
  • reboot to the freshly flashed pmOS: adb reboot recovery

You will be able to boot to pmOS by turning on the phone while holding the Volume Up button.

Display

Main display works fine with msm-fb-refresher.

External display seems to use custom mdss-spi-panel driver which is not publicly available.

WLAN

Out-of-tree prima wlan kernel module available here. Firmware can be extracted from the following mount points: 

system   => /system/etc/firmware/wlan/prima/WCNSS_cfg.dat
userdata => /misc/wifi/WCNSS_qcom_cfg.ini
persist  => /WCNSS_qcom_wlan_nv.bin
persist  => /WCNSS_wlan_dictionary.dat

To enable the module in pmOS run the following (as root): 

# echo 1 > /dev/wcnss_wlan
# echo sta > /sys/module/wlan/parameters/fwpath

Unfortunately, nmcli didn't work for me, but iw dev wlan0 scan did the trick. Won't connect to any network though.

Modem

Followed an approach described here with no luck: getting smd_pkt_open: DATA5_CNTL open failed -19 in dmesg while trying to access the modem.

With echo 1 > /sys/kernel/boot_adsp/boot modem at least boots up (using rmt_storage binary ripped out of KaiOS), but DATA5_CNTL is still unavailable.

Allocation tables (output of /sys/kernel/debug/smd/ch) is here.

According to the following lines in dmesg, it looks like something tries to reach USB diag device which is not available: 

[  502.693072] diag: USB ch diag is not connected
[  502.693080] diag: In diag_process_smd_read_data, diag_device_write error: -19

Tried to set the following USB configuration options with no luck as well: 

# echo "0" > /sys/class/android_usb/android0/enable
# echo "diag" > /sys/class/android_usb/android0/f_diag/clients 
# echo "smd" > /sys/class/android_usb/android0/f_serial/transports
# echo "qti,bam" > /sys/class/android_usb/android0/f_rmnet/transports 
# echo "diag,serial_smd,rmnet_qti_bam" > /sys/class/android_usb/android0/functions
# echo "1" > /sys/class/android_usb/android0/enable

It is possible that the modem requires sending a DPM (data port management) QMI command to open up the DATA5_CNTL channel, as done here for the Nokia 8110 4G.

Partition layout

DDR -> /dev/block/mmcblk0p24
aboot -> /dev/block/mmcblk0p9
abootbak -> /dev/block/mmcblk0p10
boot -> /dev/block/mmcblk0p27
cache -> /dev/block/mmcblk0p31
config -> /dev/block/mmcblk0p19
devinfo -> /dev/block/mmcblk0p23
fsc -> /dev/block/mmcblk0p5
fsg -> /dev/block/mmcblk0p25
hwcfg -> /dev/block/mmcblk0p21
keystore -> /dev/block/mmcblk0p18
misc -> /dev/block/mmcblk0p16
modem -> /dev/block/mmcblk0p22
modemst1 -> /dev/block/mmcblk0p3
modemst2 -> /dev/block/mmcblk0p4
oem -> /dev/block/mmcblk0p32
pad -> /dev/block/mmcblk0p15
persist -> /dev/block/mmcblk0p29
recovery -> /dev/block/mmcblk0p28
rpm -> /dev/block/mmcblk0p11
rpmbak -> /dev/block/mmcblk0p12
sbl1 -> /dev/block/mmcblk0p7
sbl1bak -> /dev/block/mmcblk0p8
sec -> /dev/block/mmcblk0p26
simlock -> /dev/block/mmcblk0p20
splash -> /dev/block/mmcblk0p17
ssd -> /dev/block/mmcblk0p6
system -> /dev/block/mmcblk0p30
traceability -> /dev/block/mmcblk0p1
tunning -> /dev/block/mmcblk0p2
tz -> /dev/block/mmcblk0p13
tzbak -> /dev/block/mmcblk0p14
userdata -> /dev/block/mmcblk0p33

See also

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