linux-kernel - [PATCH v3 0/2] ARM: dts: aspeed: Add an alt 128M flash layout.

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Message-Id: <20260120-alt-128-v3-0-a81bdafc00a7@nvidia.com>
Date: Tue, 20 Jan 2026 11:26:15 -0800
From: Marc Olberding <molberding@...dia.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Joel Stanley <joel@....id.au>, 
 Andrew Jeffery <andrew@...econstruct.com.au>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 Marc Olberding <molberding@...dia.com>
Subject: [PATCH v3 0/2] ARM: dts: aspeed: Add an alt 128M flash layout.

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. 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 <molberding@...dia.com>
---
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 <molberding@...dia.com>