linux-kernel - [PATCH] arm64: dts: ti: k3-am64-main: Add SYSFW reserved ranges in OCRAM

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Date:   Wed, 9 Jun 2021 19:36:04 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     Nishanth Menon <nm@...com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH] arm64: dts: ti: k3-am64-main: Add SYSFW reserved ranges in OCRAM

Last 256K of OCRAM (256K@...01c0000) is reserved for SYSFW usage. Hence
add an entry in DT so that its not used for generic pool memory
allocation.

Without this certain drivers using SRAM as generic shared memory pool
may end up being allocated memory from this range and will lead to boot
time crash when the reserved range is accessed (due to firewall
violation).

Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
---
 arch/arm64/boot/dts/ti/k3-am64-main.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
index f1c42ef05e52..77b88e536534 100644
--- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
@@ -16,6 +16,10 @@ oc_sram: sram@...00000 {
 		atf-sram@0 {
 			reg = <0x0 0x1a000>;
 		};
+
+		dmsc-sram@...000 {
+			reg = <0x1c0000 0x40000>;
+		};
 	};
 
 	gic500: interrupt-controller@...0000 {
-- 
2.31.1