ASUS Transformer Pad (asus-tf300t)

U-Boot
Primary Bootloader	Works
Secondary Bootloader	Works
Mainline	Works
Internal Storage	Works
SD card	Works
USB Host	Works
USB Peripheral	Works
Display	Works
Keyboard	Broken
Buttons	Works

Features
Flashing	Works
USB Networking	Works
Internal storage
SD card
Battery	Works
Screen	Works
Touchscreen	Works
Keyboard	Works
Touchpad	Works
Multimedia
3D Acceleration	Partial
Audio	Works
Camera	Broken
Camera Flash
Connectivity
WiFi	Works
Bluetooth	Works
Ethernet
GPS	Partial
Miscellaneous
FDE	Works
USB-A	Works
HDMI/DP	Works
Sensors
Accelerometer	Works
Magnetometer	Works
Ambient Light	Works
Hall Effect	Works
Haptics

Asus Transformer Pad
	; ASUS Transformer Pad
Manufacturer	Asus
Name	Transformer Pad
Codename	asus-tf300t
Released	2012
Type	detachable
Hardware
Chipset	Nvidia Tegra 3 (T30L)
CPU	Quad-core 1.3 GHz Cortex-A9
GPU	NVIDIA ULP GeForce GPU 12 cores
Display	1280x800 IPS
Storage	16/32 GB
Memory	1 GB
Architecture	armv7
Software
Original software	Android
Original version	4.0 on Linux 3.1
FOSS bootloader	yes
postmarketOS
Category	community
Pre-built images	yes
postmarketOS kernel	mainline grate
Generic port	Nvidia Tegra armv7 (nvidia-tegra-armv7)

This device is supported as part of a generic port. Refer to Nvidia Tegra armv7 (nvidia-tegra-armv7) for installation instructions and more information.

This device is based on the Tegra 3. See the SoC page for common tips, guides and troubleshooting steps

Contributors

osctobe (Michał Mirosław)
Clamor
Ion Agorria

Device owners

Clamor (Notes: pmOS with Grate kernel and U-Boot)
Jja2000
MartijnBraam
Rudloff
StephanieBread (Notes: pmOS edge with mate, using as a notebook for taking notes on college lectures, I really love keyboard of this tablet!)
V1M4dr0n (Notes: pmOS with Grate kernel and U-Boot on eMMC. TF300TG variant)

Variants

TF300T - regular wifi only tablet, currently has support both in pmaports and grate Linux kernel fork.
TF300TG - 3G version of TF300T with some slight differences. Modem is very close to Nexus 7 2012 cellular (tilapia).
TF300TL - LTE version of TF300T with differences similar to TF300TG. Uses Asus custom modem setup and doesn't have mainline driver for it.

Note: TF300TL has experimental support in this grate fork. TF300T and TF300TG are officially supported.

Unlocking

This is only needed if you do not want to use U-boot

The first step to do anything with the device is unlocking, with this device its done by sideloading the unlock apk from asus and clicking a few buttons in the app. In case you get a network connection error, you will need to patch the unlocker.

Compiling a kernel

Android kernel

3.1 kernel based on ASUS sources with updates till Oreo support (Morpheus kernel)
3.4 kernel as a part of Unlegacy Android Project (Unlegacy kernel)

Mainline (Grate)

Baseline kernel sources on master: https://github.com/grate-driver/linux
Proper dts for TF300T is added
Version: 6.0.6
Status: Boots. Almost full support.

Hardware status (mainline)

Status	Hardware	Info
Y	Booting	boot.img has restriction of approx 8MB, which is /boot partition size.
Y	Bootloader	Open source bootloader U-Boot is available as alternative for stock Asus bootloader and can replace it. U-Boot can not boot downstream kernel due to TrustZone problem.
Y	Panel	Innolux G101ICE-L01 WXGA (1280x800) LCD IPS panel through LVDS controller.
Y	HDMI output	HDMI works, but maximum output is 1080p due to Tegra 3 limitations.
Y	Touchscreen	Used Elantech EKTH1036 touchscreen.
Y	USB	One full size USB 2.0 in dock or via 40pin adapter.
Y	SD cards	MicroSD card and full sized SD card (recognized as USB drive) in dock.
Y	Internal memory	Hynix emmc, works.
P	GPS	Broadcom GPS BCM4751 is used. Needs more attention.
Y	WiFi	Uses Azurewave AW-NH615 BCM4329. Wi-Fi works and firmwares are included.
Y	Bluetooth	Uses Azurewave AW-NH615 BCM4329B1. Works fine out of the box.
Y	GPIO keys	There is 3 keys on GPIO: Power, Volume up, Volume down. Additionally GPIO-keys like are LID sensor and Audio dock line-out detect.
Y	Dock Keyboard	Both pad and dock have Nuvoton NPCE795LA0BX embedded controller which handles battery data, charging, leds, keyboard and touchpad. Driver of this EC is mainlined and is fully functional. Keyboard and Touchpad work. Alt Gr can be used for alternate multimedia keys instead of escape, fn keys, volumes and delete. Alt GR + Lock changes the default key mode.
Y	Battery/Charger	Driver is based on Texas Instruments bq24725 SMBus Charge Controller driver and GPIO charger but works through pad/dock EC. Charging and charge level of both batteries are shown correctly.
Y	PMIC	Transformers use Texas Instruments TPS659110 PMIC and TPS62361 core regulator.
Y	Sound	Sound codec is WM8903 on TF300T and RT5631 on cellular models. Kernel driver and tegra_wm8903/tegra_rt5631 glue drivers are present. UCMs are ready. Audio through HDMI works.
Y	Voice processor	Transformers use separate Fortemedia FM34NE voice processor. Mainline driver prototype is available but kernel lacks way to get mic status (dsp is internal mic dependent), set into constant bypass mode.
Y	Thermal sensor	NCT1008 ON Semiconductor LM90 series thermometer.
Y	Orientation sensors	Include Invensense mpu3050 gyroscope with Kionix KXTF9 accelerometer and Aichi AMI306 3-axis digital compass.
Y	Light sensor	Driver Dyna-Image AL3010. Brightness regulation works, install iio-sensor-proxy . It's slightly oversensitive.
N	Front camera	Aptina mi1040 camera sensor. Grate kernel doesn't support VI yet. Mainline linux driver exists (authored by Okias) and proper nodes are added to device tree.
N	Rear camera	Is not planned to be added to support list. If you have such a need, development is welcome. Mainline driver doesn't exist.
P	ULP GeForce	GPU Acceleration partially works.
N	Modem	TF300TG uses XMM6260. TF300TL in downstream uses some Asus implementation of modem driver. Contributions are welcome, no work done yet.

Usability

Desktop environment

Since 3D acceleration is not available yet, all DE which use it will be painfully slow and laggy.

Currently xfce4 or mate are recommended.

U-Boot

WARNING: This part is HIGHLY EXPERIMENTAL! DO NOT USE THIS IF YOU DO NOT KNOW WHAT YOU ARE DOING.

Further procedure needs pre-made nvflash. Files blob.bin and bricksave.img are only thing that will save you from full brick and allow replace/restore Asus bootloader.

Installing PMOS with U-Boot on eMMC

1. Primary, we need to compile a u-boot on legacy branch:

$ git clone https://github.com/clamor-s/u-boot -b legacy
$ cd ~/legacy
$ export CROSS_COMPILE=arm-linux-gnueabi-
$ make transformer_t30_defconfig tf300tg.config # Make sure to use the correct model number
$ make all

Copy u-boot-dtb-tegra.bin file to nvflash folder. Now, flash new bootloader with nvflash tool. Go to nvflash folder and do (Make sure to flash to EBT partition):

# ./wheelie --blob blob.bin
# ./nvflash --resume --download 4 u-boot-dtb-tegra.bin

2. Secondary, during the Installation process add --split option then export:

$ pmbootstrap pull
$ pmbootstarp init
$ pmbootstrap install --split # --fde (optional)
$ pmbootstrap export

3. Finally, set /boot partition: Mount pm_boot, copy dtb from dtbs folder to root directory (NOT rootfs), make uInitrd:

# mount /tmp/postmarketOS-export/asus-tf300tg-boot.img /mnt/tmp/
# cd /mnt/tmp/
# cp /mnt/tmp/dtbs/tegra30-asus-tf300tg.dtb /mnt/tmp/
# mkimage -n "Ramdisk Image" -A arm -O linux -T ramdisk -C gzip -d initramfs uInitrd
# umount  /mnt/tmp

Go to nvflash folder and flash /root and /boot to tablet (Make sure to flash /root to UDA and /boot to APP):

# ./wheelie --blob blob.bin
# ./nvflash --resume --download 17 /tmp/postmarketOS-export/asus-tf300tg-root.img
# ./wheelie --blob blob.bin
# ./nvflash --resume --download 10 /tmp/postmarketOS-export/asus-tf300tg-boot.img

Issue with rootfs size

When install with --fde option (Maybe without encryption issue the same. It's not tested yet), the rootfs size less than Data partition on tablet. To fix it, we'll need sdcard as Live boot (just install PMOS on it). Load from sdcard, unlock crypt_LUKS and do:

# parted /dev/mapper/luks-xxxxx
(parted) print all # Look at max size partition
(parted) resizepart 1 <max size partition>

Then lock crypt_LUKS and reboot to eMMC. The rootfs size must to be changed.

Disassembly

Dock

Remove 2 torx screws on the bottom
Remove 4 Philips screws under the glued pads on the bottom
Remove 3 Philips screws near the mouse buttons. Be careful with removing and adding back the top plastic piece, it has small clips

Tablet

See iFixit