linux-kernel - [PATCH] arm64: dts: qcom: ipq9574: add few more reserved memory region

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Date:   Fri, 2 Jun 2023 14:14:31 +0530
From:   Anusha Rao <quic_anusha@...cinc.com>
To:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <quic_srichara@...cinc.com>, <quic_gokulsri@...cinc.com>,
        <quic_sjaganat@...cinc.com>, <quic_kathirav@...cinc.com>,
        <quic_arajkuma@...cinc.com>, <quic_poovendh@...cinc.com>
Subject: [PATCH] arm64: dts: qcom: ipq9574: add few more reserved memory region

In IPQ SoCs, bootloader will collect the system RAM contents upon crash
for post-morterm analysis. If we don't reserve the memory region used
by bootloader, obviously linux will consume it and upon next boot on
crash, bootloader will be loaded in the same region, which will lead to
loss of some data, sometimes we may miss out critical information.
So lets reserve the region used by the bootloader.

Similarly SBL copies some data into the reserved region and it will be
used in the crash scenario. So reserve 1MB for SBL as well.

While at it, drop the size padding in the reserved memory region,
wherever applicable

Signed-off-by: Anusha Rao <quic_anusha@...cinc.com>
---
 arch/arm64/boot/dts/qcom/ipq9574.dtsi | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/ipq9574.dtsi b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
index 0baeb10bbdae..7d21ec0909fb 100644
--- a/arch/arm64/boot/dts/qcom/ipq9574.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
@@ -156,6 +156,16 @@
 		#size-cells = <2>;
 		ranges;
 
+		bootloader@...00000 {
+			reg = <0x0 0x4a100000 0x0 0x400000>;
+			no-map;
+		};
+
+		sbl@...00000 {
+			reg = <0x0 0x4a500000 0x0 0x100000>;
+			no-map;
+		};
+
 		tz_region: tz@...00000 {
 			reg = <0x0 0x4a600000 0x0 0x400000>;
 			no-map;
@@ -163,7 +173,7 @@
 
 		smem@...00000 {
 			compatible = "qcom,smem";
-			reg = <0x0 0x4aa00000 0x0 0x00100000>;
+			reg = <0x0 0x4aa00000 0x0 0x100000>;
 			hwlocks = <&tcsr_mutex 0>;
 			no-map;
 		};
-- 
2.17.1