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.. SPDX-License-Identifier: GPL-2.0+
.. sectionauthor:: Stephan Gerhold <stephan@gerhold.net>
ST-Ericsson U8500 Samsung "stemmy" board
========================================
The "stemmy" board supports Samsung smartphones released with
the ST-Ericsson NovaThor U8500 SoC, e.g.
+---------------------------+----------+--------------+----------------+
| Device | Model | Codename | U-Boot |
+===========================+==========+==============+================+
| Samsung Galaxy Ace 2 | GT-I8160 | codina | ``u-boot.bin`` |
+---------------------------+----------+--------------+----------------+
| Samsung Galaxy Amp | SGH-I407 | kyle | ``u-boot.img`` |
+---------------------------+----------+--------------+----------------+
| Samsung Galaxy Beam | GT-I8530 | gavini | ``u-boot.bin`` |
+---------------------------+----------+--------------+----------------+
| Samsung Galaxy Exhibit | SGH-T599 | codina (TMO) | ``u-boot.bin`` |
+---------------------------+----------+--------------+----------------+
| Samsung Galaxy S Advance | GT-I9070 | janice | ``u-boot.bin`` |
+---------------------------+----------+--------------+----------------+
| Samsung Galaxy S III mini | GT-I8190 | golden | ``u-boot.img`` |
+---------------------------+----------+--------------+----------------+
| Samsung Galaxy Xcover 2 | GT-S7710 | skomer | ``u-boot.img`` |
+---------------------------+----------+--------------+----------------+
At the moment, U-Boot is intended to be chain-loaded from
the original Samsung bootloader, not replacing it entirely.
Installation
------------
First, setup ``CROSS_COMPILE`` for ARMv7. Then, build U-Boot for ``stemmy``::
$ export CROSS_COMPILE=arm-none-eabi-
$ make stemmy_defconfig
$ make
This will build ``u-boot.bin`` in the configured output directory.
For newer devices (check ``u-boot.img`` in the table above), the U-Boot binary
has to be packed into an Android boot image. Devices with ``u-boot.bin`` boot
the raw U-Boot binary from the boot partition. You can build the Android boot
image with ``mkbootimg``, e.g. from from android-7.1.2_r37_::
$ mkbootimg \
--kernel=u-boot.bin \
--base=0x00000000 \
--kernel_offset=0x00100000 \
--ramdisk_offset=0x02000000 \
--tags_offset=0x00000100 \
--output=u-boot.img
.. _android-7.1.2_r37: https://android.googlesource.com/platform/system/core/+/refs/tags/android-7.1.2_r37/mkbootimg/mkbootimg
To flash the U-Boot binary, enter the Samsung download mode
(press Power + Home + Volume Down). Use Heimdall_ to flash the U-Boot image to
the Android boot partition::
$ heimdall flash --Kernel u-boot.(bin|img)
If this is not working but there are messages like ``Android recovery image`` in
the UART console, you can try flashing to the recovery partition instead::
$ heimdall flash --Kernel2 u-boot.(bin|img)
.. _Heimdall: https://gitlab.com/BenjaminDobell/Heimdall
After a reboot the U-Boot prompt should appear via UART. Unless interrupted it
automatically boots to USB Fastboot mode where Android boot images can be booted
via ``fastboot boot boot.img``. It is mainly intended to boot mainline Linux,
but booting original Samsung Android boot images is also supported (e.g. for
charging).
UART
----
UART is available through the micro USB port, similar to the Carkit standard.
With a ~619kOhm resistor between ID and GND, 1.8V RX/TX is available at D+/D-.
.. note::
Make sure to connect the UART cable **before** turning on the phone.
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