linux-kernel - [PATCH v2 5/6] ARM: dts: rainier: Add reserved memory for ramoops

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Message-Id: <20201022014731.2035438-6-andrew@aj.id.au>
Date:   Thu, 22 Oct 2020 12:17:30 +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 v2 5/6] ARM: dts: rainier: 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 16 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-ibm-rainier.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts b/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts
index 802027a3c43c..8431cf1b32e6 100644
--- a/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-ibm-rainier.dts
@@ -55,6 +55,15 @@ flash_memory: region@...00000 {
 
 		/* 48MB region from the end of flash to start of vga memory */
 
+		ramoops@...00000 {
+			compatible = "ramoops";
+			reg = <0xbc000000 0x180000>; /* 16 * (3 * 0x8000) */
+			record-size = <0x8000>;
+			console-size = <0x8000>;
+			pmsg-size = <0x8000>;
+			max-reason = <3>; /* KMSG_DUMP_EMERG */
+		};
+
 		/* VGA region is dictated by hardware strapping */
 		vga_memory: region@...00000 {
 			no-map;
-- 
2.25.1