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 <[email protected]> --- doc/board/samsung/exynos-mobile/exynos7870.rst | 40 ++------------------------ 1 file changed, 3 insertions(+), 37 deletions(-) diff --git a/doc/board/samsung/exynos-mobile/exynos7870.rst b/doc/board/samsung/exynos-mobile/exynos7870.rst index 37562e272b4..702b21244eb 100644 --- a/doc/board/samsung/exynos-mobile/exynos7870.rst +++ b/doc/board/samsung/exynos-mobile/exynos7870.rst @@ -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: -- 2.52.0
