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board: stemmy: Update documentation

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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>
This commit is contained in:
Stephan Gerhold 2021-08-07 15:07:23 +02:00 committed by Tom Rini
parent f64011e11e
commit f629895fa3
6 changed files with 100 additions and 57 deletions
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13
arch/arm/mach-u8500/Kconfig
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@ -13,14 +13,15 @@ config TARGET_STEMMY
The Samsung "stemmy" board supports Samsung smartphones released with The Samsung "stemmy" board supports Samsung smartphones released with
the ST-Ericsson NovaThor U8500 SoC, e.g. the ST-Ericsson NovaThor U8500 SoC, e.g.
- Samsung Galaxy S III mini (GT-I8190) "golden"
- Samsung Galaxy S Advance (GT-I9070) "janice"
- Samsung Galaxy Xcover 2 (GT-S7710) "skomer"
- Samsung Galaxy Ace 2 (GT-I8160) "codina" - Samsung Galaxy Ace 2 (GT-I8160) "codina"
- Samsung Galaxy Amp (SGH-I407) "kyle"
- Samsung Galaxy Beam (GT-I8530) "gavini"
- Samsung Galaxy Exhibit (SGH-T599) "codina" (TMO)
- Samsung Galaxy S Advance (GT-I9070) "janice"
- Samsung Galaxy S III mini (GT-I8190) "golden"
- Samsung Galaxy Xcover 2 (GT-S7710) "skomer"
and likely others as well (untested). See doc/board/ste/stemmy.rst for details.
See board/ste/stemmy/README for details.
endchoice endchoice

3
board/ste/stemmy/MAINTAINERS
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@ -2,5 +2,6 @@ STEMMY BOARD
M: Stephan Gerhold <stephan@gerhold.net> M: Stephan Gerhold <stephan@gerhold.net>
S: Maintained S: Maintained
F: board/ste/stemmy/ F: board/ste/stemmy/
F: include/configs/stemmy.h
F: configs/stemmy_defconfig F: configs/stemmy_defconfig
F: doc/board/ste/stemmy.rst
F: include/configs/stemmy.h

50
board/ste/stemmy/README
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@ -1,50 +0,0 @@
ST-Ericsson U8500 Samsung "stemmy" board
========================================
The "stemmy" board supports Samsung smartphones released with
the ST-Ericsson NovaThor U8500 SoC, e.g.
- Samsung Galaxy S III mini (GT-I8190) "golden"
- Samsung Galaxy S Advance (GT-I9070) "janice"
- Samsung Galaxy Xcover 2 (GT-S7710) "skomer"
- Samsung Galaxy Ace 2 (GT-I8160) "codina"
and likely others as well (untested).
At the moment, U-Boot is intended to be chain-loaded from
the original Samsung bootloader, not replacing it entirely.
Installation
------------
1. Setup cross compiler, e.g. export CROSS_COMPILE=arm-none-eabi-
2. make stemmy_defconfig
3. make
For newer devices (golden and skomer), the U-Boot binary has to be packed into
an Android boot image. janice boots the raw U-Boot binary from the boot partition.
4. Obtain mkbootimg, e.g. https://android.googlesource.com/platform/system/core/+/refs/tags/android-7.1.2_r37/mkbootimg/mkbootimg
5. mkbootimg \
--kernel=u-boot.bin \
--base=0x00000000 \
--kernel_offset=0x00100000 \
--ramdisk_offset=0x02000000 \
--tags_offset=0x00000100 \
--output=u-boot.img
6. Enter Samsung download mode (press Power + Home + Volume Down)
7. Flash U-Boot image to Android boot partition using Heimdall:
https://gitlab.com/BenjaminDobell/Heimdall
heimdall flash --Kernel u-boot.(bin|img)
8. After reboot U-Boot prompt should appear via UART.
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-.
Make sure to connect the UART cable *before* turning on the phone.

1
doc/board/index.rst
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@ -26,6 +26,7 @@ Board-specific doc
sipeed/index sipeed/index
socionext/index socionext/index
st/index st/index
ste/index
tbs/index tbs/index
ti/index ti/index
toradex/index toradex/index

9
doc/board/ste/index.rst Normal file
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@ -0,0 +1,9 @@
.. SPDX-License-Identifier: GPL-2.0+
ST-Ericsson
===========
.. toctree::
:maxdepth: 2
stemmy

81
doc/board/ste/stemmy.rst Normal file
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@ -0,0 +1,81 @@
.. 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.