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Including this allows the user to write to each partition on the alternate spi chip. This dtsi follows the existing standard of using the same layout as non alt version and prepending `alt` to each partition's name. Testing: Include this in msx4 and cat size, offsets and name ``` for devdir in /sys/class/mtd/mtd*; do > [[ -d $devdir && -r $devdir/name ]] || continue > name=3D$(<"$devdir/name") > [[ $name =3D=3D alt* ]] || continue > > size=3D$(<"$devdir/size") > offset=3D0 > [[ -r $devdir/offset ]] && offset=3D$(<"$devdir/offset") > > dev=3D$(basename "$devdir") > printf "%s name=3D%s offset=3D0x%X size=3D0x%X\n" "$dev" "$name" \ > "$offset" "$size" > done mtd10 name=3Dalt-rofs offset=3D0xA00000 size=3D0x5600000 mtd11 name=3Dalt-rwfs offset=3D0x6000000 size=3D0x2000000 mtd7 name=3Dalt-u-boot offset=3D0x0 size=3D0xE0000 mtd8 name=3Dalt-u-boot-env offset=3D0xE0000 size=3D0x20000 mtd9 name=3Dalt-kernel offset=3D0x100000 size=3D0x900000 ``` Also ran dtbs_check on an existing dts with this included. Signed-off-by: Marc Olberding --- Add a layout for an alternate 128M flash layout. This is useful for the aspeed ast2500[2] and ast2600[1] SoCs, where it has the ability to boot from one of two spi chips, nominally the primary and backup SPIs. Adding a layout allows userspace to flash the alternate spi by partition and switch over to it, allowing lower downtime for firmware flash, or for updating the primary flash from the golden backup flash. This is already an established scheme for the 32M and 64M layouts, where the layout is the same but each partition has `alt` prepended to its name. This allows userspace to just prepend alt to the images in the update process to specify which flash chip to update. References: [1] https://www.aspeedtech.com/server_ast2600/ [2] https://www.aspeedtech.com/server_ast2500/ --- .../dts/aspeed/openbmc-flash-layout-128-alt.dtsi | 32 ++++++++++++++++++= ++++ 1 file changed, 32 insertions(+) diff --git a/arch/arm/boot/dts/aspeed/openbmc-flash-layout-128-alt.dtsi b/a= rch/arm/boot/dts/aspeed/openbmc-flash-layout-128-alt.dtsi new file mode 100644 index 0000000000000000000000000000000000000000..08ce2eab472c3da4aa3d841adb0= eb1c971e6a25a --- /dev/null +++ b/arch/arm/boot/dts/aspeed/openbmc-flash-layout-128-alt.dtsi @@ -0,0 +1,32 @@ +// SPDX-License-Identifier: GPL-2.0+ + +partitions { + compatible =3D "fixed-partitions"; + #address-cells =3D <1>; + #size-cells =3D <1>; + + u-boot@0 { + reg =3D <0x0 0xe0000>; // 896KB + label =3D "alt-u-boot"; + }; + + u-boot-env@e0000 { + reg =3D <0xe0000 0x20000>; // 128KB + label =3D "alt-u-boot-env"; + }; + + kernel@100000 { + reg =3D <0x100000 0x900000>; // 9MB + label =3D "alt-kernel"; + }; + + rofs@a00000 { + reg =3D <0xa00000 0x5600000>; // 86MB + label =3D "alt-rofs"; + }; + + rwfs@6000000 { + reg =3D <0x6000000 0x2000000>; // 32MB + label =3D "alt-rwfs"; + }; +}; --- base-commit: d358e5254674b70f34c847715ca509e46eb81e6f change-id: 20251211-alt-128-layout-221a40665f08 Best regards, --=20 Marc Olberding