Re: [PATCH v8 5/5] dt-bindings: chosen: Document linux,low-memory-range for arm64 kdump
From: Rob Herring <robh+dt@kernel.org>
Date: 2020-05-21 13:29:31
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kexec, linux-arm-kernel, linux-doc, lkml
On Thu, May 21, 2020 at 3:35 AM Chen Zhou [off-list ref] wrote:
Add documentation for DT property used by arm64 kdump: linux,low-memory-range. "linux,low-memory-range" is an another memory region used for crash dump kernel devices. Signed-off-by: Chen Zhou <redacted> --- Documentation/devicetree/bindings/chosen.txt | 25 ++++++++++++++++++++ 1 file changed, 25 insertions(+)
chosen is now a schema documented here[1].
quoted hunk ↗ jump to hunk
diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt index 45e79172a646..bfe6fb6976e6 100644 --- a/Documentation/devicetree/bindings/chosen.txt +++ b/Documentation/devicetree/bindings/chosen.txt@@ -103,6 +103,31 @@ While this property does not represent a real hardware, the address and the size are expressed in #address-cells and #size-cells, respectively, of the root node. +linux,low-memory-range +---------------------- +This property (arm64 only) holds a base address and size, describing a +limited region below 4G. Similar to "linux,usable-memory-range", it is +an another memory range which may be considered available for use by the +kernel.
Why can't you just add a range to "linux,usable-memory-range"? It shouldn't be hard to figure out which part is below 4G. Rob [1] https://github.com/devicetree-org/dt-schema/blob/master/schemas/chosen.yaml