Samsung Galaxy SIII LTE (samsung-i9305)

From postmarketOS
Revision as of 11:59, 7 September 2020 by Maxnet (talk | contribs) (Updated Architecture, Added Note)
Jump to navigation Jump to search
This device is still running on armhf, although the processor supports armv7. If you own it, change it and test it that way.
Samsung Galaxy S III LTE
Samsung Galaxy SIII LTE
Samsung Galaxy SIII LTE
Manufacturer Samsung
Name Galaxy S III LTE
Codename samsung-i9305
Released 2012
Category testing
Original software Android 4.1.1
Chipset Exynos 4412 Quad
CPU Quad-core 1.4 GHz Cortex-A9
GPU Mali-400MP4
Display 720x1280 Super AMOLED
Storage 16 GB
Memory 2 GB
Architecture armv7
USB Networking
3D Acceleration
Mobile data

So far, what works for samsung-i9305 (Galaxy SIII LTE version) also works for the samsung-i9300 (Galaxy SIII international GSM version without LTE) and samsung-shv-e210s (a Korean variant). (None of these SIII models should be confused with the North American SIII models, which require OS builds.)

Users owning this device

  • Arthurlutz (Notes: /e/ 0.11 (android 7 pie))
  • Eloy
  • EnderNightLord (Notes: i9300 1gb ram)
  • Illen (Notes: is a GT-i9300. Battery is broken, works on charger.)
  • Mossroy (Notes: sometimes used : It can not be flashed easily. Seems to have a hardware issue with current consumption, even with a new battery)
  • Neilvandyke (Notes: has GT-i9300)


  • tyxieblub
  • colaur

How to enter flash mode

  • Hold power + Home + volume down
  • When prompted, release all buttons and press volume up


Set phone to ODIN mode

 1. Turn off phone
 2. Connect USB cable
 3. Hold VOLUME_DOWN + HOME + POWER until you get Warning!! screen
 4. Push VOLUME_UP to continue to ODIN mode screen
# Ready the build
pmbootstrap init (weston or xfce4 should do)

# Install rootfs to Micro SD Card
pmbootstrap --sdcard=/dev/mmcblk0/1/2/3 # (will depend on where your Micro SD Card is mounted)

# Put the i9305 / i9300 into odin mode with the steps above and flash the kernel (to boot from the Micro SD Card)
pmbootstrap flasher flash_kernel # (in odin mode)

# and it should reboot automatically

Installing with downstream kernel

mkdir ~/code
cd ~/code
git clone

alias pmbootstrap=~/code/pmbootstrap/
pmbootstrap init
#work path default

pmbootstrap initfs hook_add debug-shell
#Check log with 'tail -f ~/.local/var/pmbootstrap/log.txt'

#CREATE RECOVERY ZIP (for flashing with TWRP)
pmbootstrap install --no-fde --android-recovery-zip

cp ~/.local/var/pmbootstrap/chroot_buildroot_armhf/var/lib/postmarketos-android-recovery-installer/ /media/computer/sdcard/
#Insert sdcard in phone
#Reboot on recovery with up+home+power
#Install from zip

#Connect with USB cable


To get the wifi working, you'll need to modify the wpa_supplicant configuration. If this is not done, wpa_supplicant starts with -ip2p0 which is not supported on our device.

 $ echo 'wpa_supplicant_args="-Dwext"' | sudo tee /etc/conf.d/wpa_supplicant

You can use either Network manager or networking and wpa_supplicant. Network manager is recommend in most cases as it handles reconnection.

Network Manager

Ensure the networkmanger service is running

 $ sudo rc-status | grep 'networkmanager'

if it not visible, try to start the service:

 $ sudo rc-service networkmanager start

Search for available WiFi networks and connect to network

 $ sudo nmcli device wifi list ifname wlan0
 $ sudo nmcli --ask dev wifi connect SSID

Reboot and you should be connected.

Networking and wpa_supplicant

You will need to manually configure the interfaces by creating



 $ sudo vi /etc/network/interfaces
  auto lo
  iface lo inet loopback
  auto wlan0
  iface wlan0 inet dhcp

Save changes and add networking to start with system

$ sudo rc-update add networking

Add WiFi network information

$ wpa_passphrase YOUR_SSID YOUR_PASSPHRASE | sudo tee /etc/wpa_supplicant/wpa_supplicant.conf

Restart services

$ sudo rc-service wpa_supplicant restart
$ sudo rc-service networking start

Mainline Kernel

The mainline kernel now has some support for the Samsung Galaxy SIII LTE (i9305):

Upstream dts: exynos4412-i9305.dts

Upstream status: Midas on Mainline.

Note that a patch is required to make it work with the stock samsung bootloader.

forkbomb from LineageOS got mainline u-boot running on this device: [1]

Replicant has this device booting with mainline Linux and almost mainline U-Boot with only the need for a few patches on top and would like to collaborate with us [2]

The Qualcomm Gobi MDM9615 Modem seems to have mainline kernel support as well: [3]

Replicant and LineageOS successfully got the Lima driver for Mesa working on Mali when using mainline linux: video success announcement

Replicant currently supports this device in 6.0 and is doing a lot of research in order to get it running with a mainline kernel with a mainline bootloader for Replicant 9. More bootloader research is here.

xboot might be a completely free bootloader option. Looks to have zero proprietary blobs.

See also

Install with mainline kernel (WIP, not functional yet)

#Export image files in ~/.local/var/pmbootstrap/chroot_rootfs_samsung-i9305/boot/
pmbootstrap export

#5,3M -rw-r--r--  1 root root 5,3M déc.  22 20:31 boot.img-samsung-i9305 (initramfs + vmlinuz)
#1,3M -rw-r--r--  1 root root 1,3M déc.  22 20:31 initramfs-samsung-i9305
#6,1M -rw-r--r--  1 root root 6,1M déc.  22 20:31 initramfs-samsung-i9305-extra
#4,1M -rw-r--r--  1 root root 4,1M nov.   5 17:30 vmlinuz-samsung-i9305

#Get linux-next
cd ~/code
# Case 1 : first checkout
git clone linux
cd linux/
git fetch origin
git reset --hard origin/master
# Case 2 : update
cd linux/
git checkout master
git pull

#Prepare compile with i9305 defconfig in ~/code/linux/arch/arm/configs
source ~/code/pmbootstrap/helpers/
make exynos_defconfig
#DTS : Note that ~/code/linux/arch/arm/boot/dts/exynos4412-i9305.dts already exists and should work
#Makefile in ~/code/linux/arch/arm/boot/dts/ already contains this DTS

#Kernel compilation
make -j5

#Prepare shell
pmbootstrap chroot -- apk add abootimg android-tools mkbootimg dtbtool findutils
export DEVICE="$(pmbootstrap config device)"
export WORK="$(pmbootstrap config work)"
export TEMP="$WORK/chroot_native/tmp/mainline/"
mkdir -p "$TEMP"

#Patch boot image
cd ~/code/linux/.output/arch/arm/boot
cat zImage dts/exynos4412-i9305.dtb > "$TEMP"/zImage-dtb
cp "/tmp/postmarketOS-export/boot.img-$DEVICE" "$TEMP/boot.img"
pmbootstrap chroot
abootimg -u /tmp/mainline/boot.img  -k /tmp/mainline/zImage-dtb -c bootsize=8955904

#Flash with Heimdall - WARNING - NOT FUNCTIONNAL YET
# enter download mode with down+home+power
# Connect usb
# click 'up'
heimdall detect
heimdall flash --BOOT ~/.local/var/pmbootstrap/chroot_native/tmp/mainline/boot.img