mirror of
https://github.com/smaeul/u-boot.git
synced 2025-10-31 12:08:19 +00:00
f629895fa3
Over the time, the "stemmy" U-Boot board was tested on several other Samsung smartphones based on ST-Ericsson NovaThor Ux500. Convert the documentation to reStructuredText at doc/board/ste/stemmy.rst and make the device list complete. Also note that the board now boots into USB Fastboot instead of just ending up at the U-Boot prompt. The device table is mostly taken from the postmarketOS wiki article (https://wiki.postmarketos.org/wiki/ST-Ericsson_NovaThor_U8500). All the newly added devices were tested by Linus Walleij. Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
82 lines
3.5 KiB
ReStructuredText
82 lines
3.5 KiB
ReStructuredText
.. 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.
|