Re: [PATCH 6/6 v3] board: samsung: add Samsung Galaxy S9/S9+(SM-G96x0) board

[Dzmitry Sankouski <dsankouski@gmail.com>]

Hi!

I haven't tried to install u-boot on the phone with Android boot image
yet(though another guy in the community project I contribute, reported it
works).
I can only test u-boot with kexec, it's the only way to get debug uart for
me, without disassembling the phone.

Also I have to track down the issues with booting linux.

So, once I'll got linux booted by u-boot, I will be able to pack and
install it in Android boot partition, and write more detailed instructions.

пт, 24 сент. 2021 г. в 14:02, Stephan Gerhold <stephan@gerhold.net>:

> Hi,
>
> On Thu, Sep 23, 2021 at 09:57:32PM +0300, dsankouski@gmail.com wrote:
> > From: Dzmitry Sankouski <dsankouski@gmail.com>
> >
> > Samsung S9 SM-G9600 - Snapdragon SDM845 version of the phone,
> > for China \ Hong Kong markets.
> > Has unlockable bootloader, unlike SM-G960U (American market version),
> > which allows running u-boot as a chain-loaded bootloader.
> >
> > Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
> > Cc: Ramon Fried <rfried.dev@gmail.com>
> > Cc: Tom Rini <trini@konsulko.com>
> > ---
> > Changes for v2:
> > - Create documentation file for SDM845 boards
> > - Add starqltechn board documentation
> > Changes for v3:
> > - fix comment in starqltechn.c
> >
> >  arch/arm/dts/Makefile                   |  1 +
> >  arch/arm/dts/starqltechn-uboot.dtsi     | 39 ++++++++++++++++++
> >  arch/arm/dts/starqltechn.dts            | 53 +++++++++++++++++++++++++
> >  arch/arm/mach-snapdragon/Kconfig        | 13 ++++++
> >  board/samsung/starqltechn/Kconfig       | 14 +++++++
> >  board/samsung/starqltechn/MAINTAINERS   |  6 +++
> >  board/samsung/starqltechn/Makefile      |  9 +++++
> >  board/samsung/starqltechn/starqltechn.c | 10 +++++
> >  configs/starqltechn_defconfig           | 33 +++++++++++++++
> >  doc/board/qualcomm/index.rst            |  1 +
> >  doc/board/qualcomm/sdm845.rst           | 38 ++++++++++++++++++
> >  include/configs/starqltechn.h           | 16 ++++++++
> >  12 files changed, 233 insertions(+)
> >  create mode 100644 arch/arm/dts/starqltechn-uboot.dtsi
> >  create mode 100644 arch/arm/dts/starqltechn.dts
> >  create mode 100644 board/samsung/starqltechn/Kconfig
> >  create mode 100644 board/samsung/starqltechn/MAINTAINERS
> >  create mode 100644 board/samsung/starqltechn/Makefile
> >  create mode 100644 board/samsung/starqltechn/starqltechn.c
> >  create mode 100644 configs/starqltechn_defconfig
> >  create mode 100644 doc/board/qualcomm/sdm845.rst
> >  create mode 100644 include/configs/starqltechn.h
> >
> > [...]
> > diff --git a/doc/board/qualcomm/sdm845.rst
> b/doc/board/qualcomm/sdm845.rst
> > new file mode 100644
> > index 0000000000..cd46cbe9cf
> > --- /dev/null
> > +++ b/doc/board/qualcomm/sdm845.rst
> > @@ -0,0 +1,38 @@
> > +.. SPDX-License-Identifier: GPL-2.0+
> > +.. sectionauthor:: Dzmitry Sankouski <dsankouski@gmail.com>
> > +
> > +Snapdragon 845
> > +================
> > +
> > +About this
> > +----------
> > +This document describes the information about Qualcomm Snapdragon 845
> > +supported boards and it's usage steps.
> > +
> > +SDM845 - hi-end qualcomm chip, introduced in late 2017.
> > +Mostly used in flagship phones and tablets of 2018.
> > +
> > +U-Boot can be used as a replacement for Qualcomm's original ABL (UEFI)
> bootloader.
> > +It is loaded as an Android boot image through ABL
> > +
> > +Installation
> > +------------
> > +First, setup ``CROSS_COMPILE`` for aarch64. Then, build U-Boot for your
> board::
> > +
> > +     $ export CROSS_COMPILE=<aarch64 toolchain prefix>
> > +     $ make <your board name here, see Boards section>_defconfig
> > +     $ make
> > +
> > +This will build ``u-boot.bin`` in the configured output directory.
> > +
> > +Boards
> > +------------
> > +starqlte
> > +^^^^^^^^^^^^
> > +
> > +The starqltechn is a production board for Samsung S9 (SM-G9600) phone,
> > +based on the Qualcomm SDM845 SoC.
> > +
> > +More information can be found on the `Samsung S9 page`_.
> > +
> > +.. _Samsung S9 page: https://en.wikipedia.org/wiki/Samsung_Galaxy_S9
>
> Can you add a short explanation here how you would install the
> u-boot.bin on the Samsung S9? You say that it is loaded through an
> Android boot image, but how exactly is it built?
>
> For example, do you use an empty ramdisk, does the bootloader expect
> some dt.img etc? Something similar to the DB820c README:
>
> https://source.denx.de/u-boot/u-boot/-/blob/master/board/qualcomm/dragonboard820c/readme.txt#L32-61
>
> This would be helpful if someone wants to install U-Boot on that phone
> I think :)
>
> Thanks!
> Stephan
>