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

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Date:   Thu, 19 Nov 2020 05:18:01 +0000
From:   Joel Stanley <joel@....id.au>
To:     Andrew Jeffery <andrew@...id.au>
Cc:     Rob Herring <robh+dt@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/6] ARM: dts: tacoma: Add reserved memory for ramoops

On Thu, 22 Oct 2020 at 01:48, Andrew Jeffery <andrew@...id.au> wrote:
>
> 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>

Reviewed-by: Joel Stanley <joel@....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 09b561429579..04efabe70d9f 100644
> --- a/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts
> +++ b/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts
> @@ -34,6 +34,15 @@ 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
>