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The ASUS Transformer T30 family are 2-in-1 detachable tablets and AiO developed by ASUS that run the Android operating system (TF600T runs Windows RT and P1801-T runs Android and Windows). The T30 Transformers feature a 10.1-inch display (apart P1801-T), an Nvidia Tegra 3 quad-core chip, 1/2 GB of RAM, and 16/32 GB of storage. Transformers board derives from Nvidia Cardhu development board. This patch brings support for 7 known Transformer devices: - ASUS Transformer Prime TF201 - ASUS Transformer Pad TF300T/TF300TG/TF300TL - ASUS VivoTab RT TF600T (Windows RT based) - ASUS Transformer Infinity TF700T - ASUS Portable AiO P1801-T Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # all devices Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
117 lines
4.1 KiB
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117 lines
4.1 KiB
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.. SPDX-License-Identifier: GPL-2.0+
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U-Boot for the ASUS Transformer device family
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=============================================
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``DISCLAMER!`` Moving your ASUS Transformer to use U-Boot
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assumes replacement of the vendor ASUS bootloader. Vendor
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android firmwares will no longer be able to run on the device.
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This replacement IS reversible.
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Quick Start
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-----------
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- Build U-Boot
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- Pack U-Boot into repart-block
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- Flash repart-block into the eMMC
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- Flash repart-block into TF600T SPI flash
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- Boot
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- Self Upgrading
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Build U-Boot
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------------
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Device support is implemented by applying config fragment
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to a generic board defconfig. Valid fragments are ``tf201.config``,
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``tf300t.config``, ``tf300tg.config``, ``tf300tl.config``,
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``tf700t.config``, ``tf600t.config`` and ``p1801-t.config``.
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.. code-block:: bash
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$ export CROSS_COMPILE=arm-linux-gnueabi-
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$ make transformer_t30_defconfig tf201.config # For TF201
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$ make
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After the build succeeds, you will obtain the final ``u-boot-dtb-tegra.bin``
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image, ready for flashing (but check the next section for additional
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adjustments).
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Pack U-Boot into repar-block
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----------------------------
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``DISCLAMER!`` All questions related to re-crypt work should be asked
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in re-crypt repo issues. NOT HERE!
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re-crypt is a small script which packs ``u-boot-dtb-tegra.bin`` in
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form usable by device. This process is required only on the first
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installation or to recover the device in case of a failed update.
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You need to know your tablet's individual SBK to continue.
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.. code-block:: bash
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$ git clone https://github.com/clamor-s/re-crypt.git
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$ cd re-crypt # place your u-boot-dtb-regra.bin here
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$ ./re-crypt.sh -d tf201 -k deadbeefdeadc0dedeadd00dfee1dead
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Script will produce you a `repart-block.bin` ready to flash.
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Flash repart-block into the eMMC
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--------------------------------
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``DISCLAMER!`` All questions related to NvFlash should be asked
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in the proper place. NOT HERE! Flashing repart-block will erase
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all your eMMC, so make a backup before!
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``repart-block.bin`` contains BCT and bootloader in encrypted state
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in form which can just be written RAW at the start of eMMC.
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.. code-block:: bash
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$ wheelie --blob blob.bin
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$ nvflash --resume --rawdevicewrite 0 1024 repart-block.bin
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Flash repart-block into TF600T SPI flash
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----------------------------------------
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Unlike other transformers TF600T uses separate 4 MB SPI flash which
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contains all data required for boot. It is flashed from within u-boot
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itself preloaded into RAM using fusee gelee. After creating your
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``repart-block.bin`` you have to place it on a 1st partition of microSD
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card formated in fat. Then insert this microSD card into your tablet
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and boot it using fusee gelee and u-boot which was included into
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repart-block.bin, while booting you must hold volume down button.
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Process should take less then a minute, if everything goes correct,
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on microSD will appear ``spi-flash-backup.bin`` file, which is dump of
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your spi flash content and can be used to restore UEFI, do not loose it,
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tablet will power itself off.
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Self-updating of u-boot is performed by placing ``u-boot-dtb-tegra.bin``
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on 1st partition of microSD, inserting it into tablet and booting with
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pressed volume down button.
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Boot
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----
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After flashing ``repart-block.bin`` the device should reboot and turn
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itself off. This is normal behavior if no boot configuration is
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found.
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To boot Linux, U-Boot will look for an ``extlinux.conf`` on MicroSD
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and then on eMMC. Additionally if Volume Down button is pressed
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while booting device will enter bootmenu. Bootmenu contains entries
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to mount MicroSD and eMMC as mass storage, fastboot, reboot, reboot
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RCM, poweroff, enter U-Boot console and update bootloader (check next
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chapter).
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Flashing ``repart-block.bin`` eliminates vendor restriction on eMMC
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and allows the user to use/partition it in any way the user desires.
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Self Upgrading
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--------------
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Place your ``u-boot-dtb-tegra.bin`` on the first partition of the
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MicroSD card and insert it into the tablet. Enter bootmenu, choose
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update bootloader option with Power button and U-Boot should update
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itself. Once the process is completed, U-Boot will ask to press any
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button to reboot.
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