lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Thu, 21 May 2020 17:38:05 +0800
From:   Chen Zhou <>
To:     <>, <>,
        <>, <>, <>,
        <>, <>
CC:     <>, <>,
        <>, <>,
        <>, <>,
        <>, <>,
        <>, <>
Subject: [PATCH v8 5/5] dt-bindings: chosen: Document linux,low-memory-range for arm64 kdump

Add documentation for DT property used by arm64 kdump:
"linux,low-memory-range" is an another memory region used for crash
dump kernel devices.

Signed-off-by: Chen Zhou <>
 Documentation/devicetree/bindings/chosen.txt | 25 ++++++++++++++++++++
 1 file changed, 25 insertions(+)

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.
+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
+/ {
+	chosen {
+		linux,low-memory-range = <0x0 0x70000000 0x0 0x10000000>;
+		linux,usable-memory-range = <0x202f 0xc0000000 0x0 0x40000000>;
+	};
+The main usage is for crash dump kernel devices when reserving crashkernel
+above 4G. When reserving crashkernel above 4G, there may be two crash kernel
+regions, one is below 4G, the other is above 4G. In order to distinct from
+the high region, use this property to pass the low region.
+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.

Powered by blists - more mailing lists