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doc: board: samsung: exynos-mobile: remove requirement of stub device tree

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Flashing U-Boot for Exynos 7870 requires creating a stub device tree,
where certain properties and nodes are defined which are populated by
the previous bootloader in the phones.

Since these properties are now available in the U-Boot device tree, it's
now possible to use the same blob generated by U-Boot in place of the
stub, when creating boot images. Update the build documentation to
reflect the same.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Kaustabh Chakraborty
2026-02-03 18:38:49 +05:30
committed by Minkyu Kang
parent d73efc6841
commit 11198fa347
1 changed files with 3 additions and 37 deletions
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40
doc/board/samsung/exynos-mobile/exynos7870.rst
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@@ -6,47 +6,13 @@ Samsung Exynos 7870 Boards
Preparation
-----------
Create the following device tree (named ``stub.dts``)
.. code-block:: devicetree
/dts-v1/;
/ {
compatible = "samsung,exynos7870";
#address-cells = <2>;
#size-cells = <1>;
model_info-chip = <7870>;
model_info-hw_rev = <0>;
model_info-hw_rev_end = <255>;
chosen {
};
memory@80000000 {
device_type = "memory";
reg = <0x0 0x80000000 0x0>;
};
memory@100000000 {
device_type = "memory";
reg = <0x1 0x00000000 0x0>;
};
};
The chosen node and memory ranges are populated by S-BOOT. A certain device
model may have multiple variants, with differing amounts of RAM and storage. The
RAM capacity information is graciously provided by S-BOOT's device tree
overlays.
Compile it to a device tree blob, then pack it in the QCDT format [1]_ using
``dtbTool-exynos`` [2]_ by issuing the following commands:
Pack the device tree blob in the QCDT format [1]_ using ``dtbTool-exynos`` [2]_
by issuing the following commands:
.. prompt:: bash $
dtc -I dts -O dtb -o stub.dtb stub.dts
dtbTool-exynos -o stub-dt.img stub.dtb
dtbTool-exynos -o stub-dt.img .output/u-boot.dtb
Finally, use ``mkbootimg`` by osm0sis [3]_ to generate the boot image: