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