From: Victor Gu <xigu@xxxxxxxxxxx>
The PSCI area should be reserved in Linux for PSCI operations such as
suspend/resume.
Reserve 2MiB of memory which matches the area used by ATF (BL1, BL2,
BL3x, see [1] in ATF source code). This covers all PSCI code and data
area and is 2MiB aligned, which is required by Linux for huge pages
handling.
Please note that this is a default setup allowing to perform PSCI
operations with legacy bootloaders. Recent bootloaders should update the
region size/position accordingly.
[1] plat/marvell/a3700/common/include/platform_def.h
Signed-off-by: Victor Gu <xigu@xxxxxxxxxxx>
[miquel.raynal@xxxxxxxxxxx: reword of commit message, comment in the DTSI]
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
Changes since v1:
=================
* Updated commit log to explain that this memory region should be
updated by recent bootloaders.
* Added a comment to tell the same thing above the psci-area subnode.
arch/arm64/boot/dts/marvell/armada-37xx.dtsi | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
index 3353252d78a0..d18a4a098d79 100644
--- a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
@@ -22,6 +22,21 @@
serial1 = &uart1;
};
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ /*
+ * The PSCI firmware region depicted below is the default one
+ * and should be updated by the bootloader.
+ */
+ psci-area@4000000 {
+ reg = <0 0x4000000 0 0x200000>;
+ no-map;
+ };
+ };
+
cpus {
#address-cells = <1>;
#size-cells = <0>;
--
2.14.1
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