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@marvell.com>
[miquel.raynal@bootlin.com: reword of commit message, comment in the DTSI]
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
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>;