The Samsung RD-PQ developer device is also known as M0 or TRATS2 and is based on a Samsung Galaxy S3 device, though it is missing any radio capabilities since it’s a developer device.
WiFi connectivity on Tizen 2.3.1 ( or 2.3 for what matters) does not work out of the box for a Samsung RD-PQ developer device due to the fact that the images found on the main Tizen website are not complete and they are missing some important components.
Let’s see how we can improve that.
You will need access to an Ubuntu (preferably) machine or virtual-machine in order to use the lthor utility for updating the images on your RD-PQ device. On the Tizen website it is specified that a Thor utility exists for Windows, but I was unable to find it. Just fire up an Ubuntu virtual machine into your favorite VM application (VirtualBox preferably, you can use Qemu, VMware, etc) or an Azure/AWS instance. The Linux machine will be needed just for the bootloader migration and the actual OS install. You won’t be needing it again except if you want to reinstall the OS. You can install the lthor utility now.
Add the Tizen tools repository.
$ sudo vi /etc/apt/sources.list
Append the following line, save and quit.
deb http://download.tizen.org/tools/latest-release/Ubuntu_14.04 /
Install the utility.
$ sudo apt-get update $ sudo apt-get install lthor
2. Migrate bootloader
First, you need to migrate your bootloader to 2.3, so download the tar.gz archive (249Kb) from the Tizen website. Put your phone into download mode by pressing PowerKey and VolumeDown (while it’s off) and upload the archive into your phone:
$ sudo lthor migrate_2.3_bootloader.tar.gz
3. Install Tizen OS 2.3.1
$ sudo lthor tizen-2.3.1-mobile_20150921.1_mobile_boot.tar.gz tizen-2.3.1-mobile_20150921.1_mobile_target.tar.gz
From what I’ve noticed, sometimes you can’t upload both images in one go, so you might need to send them to the phone separately:
$ sudo lthor tizen-2.3.1-mobile_20150921.1_mobile_boot.tar.gz $ sudo lthor tizen-2.3.1-mobile_20150921.1_mobile_target.tar.gz
Wait till the phone boots into Tizen 2.3.1 and now you should have a pretty functional phone (without all Tizen UI apps) but unfortunately, you can’t turn WiFi on. Pressing the grey button in Settings -> WiFi will just hang on Tizen 2.3, while on 2.3.1 you will be able to turn WiFi on, but the phone won’t be able to connect to any networks.
4. Enable WiFi interface
There are three culprits for this behavior. First, there is no installed wlan driver for the BCM 43xx network chip inside your phone. Download the packaged rpm (1.3Mb) and install it on the phone (it is made for Tizen 2.1, but will work on 2.3 and 2.3.1.
sdb root on sdb push wlandrv-plugin-tizen2.1-bcm43xx-1.0.4-1.armv7l.rpm /home sdb shell sh-4.1# rpm -ivh /home/wlandrv-plugin-tizen2.1-bcm43xx-1.0.4-1.armv7l.rpm --force --nodeps sh-4.1# sync sh-4.1# reboot
Secondly, the component that is supposed to activate the wlan0 interface is missing two links and last, wifi_supplicant is based on a rpm package that is missing from the main Tizen OS image.
sdb root on sdb shell sh-4.1# ln -s /usr/sbin/modprobe /sbin/modprobe sh-4.1# ln -s /usr/sbin/rmmod /sbin/rmmod
This will create the two missing links in the OS and if you want to turn on the WiFi connection, you can do that now. You can either press the grey WiFi button from the Settings -> WiFi UI or just issue a shell command to start it.
sh-4.1# /usr/bin/wlan.sh start
The wlan.sh script should pick up your chip driver / settings and activate wlan0 which you can check by entering:
5. Enable WiFi network connectivity
The third issue is that if you try to connect to a wireless network, you will get the message Wrong Password for every connection, even if the password is correct. The problem lies with the wpa_supplicant program. Thing is, wpa_supplicant is enabled via the /usr/sbin/wpa_supp.sh script, and the script depends on a rpm package that is not installed by default, usleep. That package is not available for Tizen 2.3 or 2.3.1, so we have to get creative. Download the rpm (6.6Kb) from the Tizen 2.2 repository (don’t worry, it will work for Tizen 2.3 and 2.3.1) and install it on your phone.
sdb root on sdb push usleep-1-4.1.armv7l.rpm /home sdb shell sh-4.1# rpm -ivh /home/usleep-1-4.1.armv7l.rpm sh-4.1# sync sh-4.1# reboot
After the phone boots into the Tizen UI, you will be able to activate WiFi via Settings -> WiFi UI or via console.
sh-4.1# /usr/bin/wlan.sh start sh-4.1# /usr/sbin/wpa_supp.sh start
6. Auto-enable WiFi and auto-connect to a wireless network
If you connect to a wireless network once via the Tizen UI, you will be able to make the phone connect automatically to that network after each restart via two systemd scripts I’ve created.
First one is called wlan-1.service.
[Unit] Description=Wireless network connectivity 1 Wants=network.target Before=network.target wlan-2.service [Service] Type=oneshot RemainAfterExit=yes ExecStart=/usr/bin/wlan.sh start [Install] WantedBy=multi-user.target
Second one is called wlan-2.service.
[Unit] Description=Wireless network connectivity 2 Wants=network.target Before=network.target Requires=wlan-1.service [Service] Type=oneshot RemainAfterExit=yes ExecStart=/usr/sbin/wpa_supp.sh start [Install] WantedBy=multi-user.target
Also, sometimes the connman program that manages the wireless connection doesn’t restart automatically, so I’ve changed the connman.service systemd unit file for it too.
[Unit] Description=Connection service After=shutdown.target Requires=wlan-2.service [Service] Type=dbus BusName=net.connman RemainAfterExit=yes ExecStartPre=/usr/bin/dbus-send --system --dest=net.netconfig / net.netconfig.auto.activate ExecStart=/usr/sbin/connmand [Install] WantedBy=multi-user.target
The three scripts are chained via After and Requires commands that ensure they will be started in the correct order: wlan-1, wlan-2 and finally connman. Upload the 3 files into your phone and enable them into systemd:
sdb root on sdb push *.service /etc/systemd/system/ sdb shell sh-4.1# systemctl enable wlan-1 sh-4.1# systemctl enable wlan-2 sh-4.1# systemctl enable connman sh-4.1# sync sh-4.1# reboot
After the phone reboots, the connection will be made automatically, no need to enable WiFi manually, so now you can uninstall the Tizen UI (the Xorg server actually) and any unneeded services, and you will be able to connect to the phone via SSH. But that in the next article.
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