[PATCH 3/4] arm64: tegra186: add reserved-only flag in sysram node

[Mian Yousaf Kaukab]

bpmp driver has reserved regions in sysram. Since sysram is only used
by the bpmp driver, add âreserved-onlyâ flag to the sysram node so
that only regions used by the bpmp driver are remapped. Other regions
of the sysram may not be accessible to the kernel and a speculative
access to them can cause SError.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@xxxxxxx>
---
 arch/arm64/boot/dts/nvidia/tegra186.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
index 58100fb9cd8b..07ce7e7b270c 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
@@ -1219,6 +1219,7 @@ sysram@30000000 {
 		#address-cells = <2>;
 		#size-cells = <2>;
 		ranges = <0 0x0 0x0 0x30000000 0x0 0x50000>;
+		reserved-only;
 
 		cpu_bpmp_tx: shmem@4e000 {
 			compatible = "nvidia,tegra186-bpmp-shmem";
-- 
2.25.0