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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. This series also adds support for the msx4 to use this layout. References: [1] https://www.aspeedtech.com/server_ast2600/ [2] https://www.aspeedtech.com/server_ast2500/ Signed-off-by: Marc Olberding --- Changes in v3: - Reworded commit adding alt flash layout and fixed formatting issues - Expanded testing section - Readded the Changes in v2 section, somehow they got lost - Link to v2: https://lore.kernel.org/r/20251218-alt-128-v2-0-10499a0b7eb9@nvidia.com Changes in v2: - Retargetted series for the bmc tree - Added a usage of the dtsi in the MSX4 device tree - Link to v1: https://lore.kernel.org/all/20251211-alt-128-layout-v1-1-100f57d2bc4a@nvidia.com/ --- Marc Olberding (2): ARM: dts: aspeed: add an alt 128M flash layout ARM: dts: aspeed: Add alt partition support to msx4 .../boot/dts/aspeed/aspeed-bmc-nvidia-msx4-bmc.dts | 1 + .../dts/aspeed/openbmc-flash-layout-128-alt.dtsi | 32 ++++++++++++++++++++++ 2 files changed, 33 insertions(+) --- base-commit: 459a5aa171c0f13fcd78faa9594dc4aa5a95770b change-id: 20251218-alt-128-19270d894872 Best regards, -- Marc Olberding