linux-kernel - [PATCH 2/2] ARM: dts: tacoma: Add reserved memory for ramoops

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Date:   Fri, 16 Oct 2020 15:05:13 +1030
From:   Andrew Jeffery <andrew@...id.au>
To:     joel@....id.au
Cc:     robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] ARM: dts: tacoma: Add reserved memory for ramoops

Reserve a 1.5MiB region of memory to record kmsg dumps, console and
userspace message state into 16kiB ring-buffer slots. The sizing allows
for up to 32 dumps to be captured and read out.

Set max-reason to KMSG_DUMP_EMERG to capture bad-path reboots.

Signed-off-by: Andrew Jeffery <andrew@...id.au>
---
 arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts b/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts
index 46f2f538baba..4f7e9b490e1a 100644
--- a/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts
@@ -26,6 +26,15 @@ reserved-memory {
 		#size-cells = <1>;
 		ranges;
 
+		ramoops@...80000 {
+			compatible = "ramoops";
+			reg = <0xb9e80000 0x180000>;
+			record-size = <0x4000>;
+			console-size = <0x4000>;
+			pmsg-size = <0x4000>;
+			max-reason = <3>; /* KMSG_DUMP_EMERG */
+		};
+
 		flash_memory: region@...00000 {
 			no-map;
 			reg = <0xb8000000 0x4000000>; /* 64M */
-- 
2.25.1