linux-kernel - [PATCH v1] arm64: dts: qcom: ipq5424: add reserved memory region for bootloader

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Message-ID: <20250312094948.3376126-1-quic_mmanikan@quicinc.com>
Date: Wed, 12 Mar 2025 15:19:48 +0530
From: Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
To: <andersson@...nel.org>, <konradybcio@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: <quic_varada@...cinc.com>, <quic_srichara@...cinc.com>
Subject: [PATCH v1] arm64: dts: qcom: ipq5424: add reserved memory region for bootloader

In IPQ5424, the bootloader collects the system RAM contents upon a crash
for post-morterm analysis. If we don't reserve the memory region used by
the bootloader, linux will consume it. Upon the next boot after a crash,
the bootloader will be loaded in the same region, which could lead to the
loss of some data. sometimes, we may miss out critical information.
Therefore, let's reserve the region used by the bootloader.

Signed-off-by: Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
---
 arch/arm64/boot/dts/qcom/ipq5424.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/ipq5424.dtsi b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
index 7a7ad700a382..cd1acf3898ac 100644
--- a/arch/arm64/boot/dts/qcom/ipq5424.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq5424.dtsi
@@ -132,6 +132,11 @@ reserved-memory {
 		#size-cells = <2>;
 		ranges;
 
+		bootloader@...00000 {
+			reg = <0x0 0x8a200000 0x0 0x400000>;
+			no-map;
+		};
+
 		tz@...00000 {
 			reg = <0x0 0x8a600000 0x0 0x200000>;
 			no-map;

base-commit: 0a2f889128969dab41861b6e40111aa03dc57014
-- 
2.34.1