2020-10-22 07:58:50

by Andrew Jeffery

Subject: [PATCH v2 6/6] 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 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 <[email protected]>
---
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@b8000000 {

/* 48MB region from the end of flash to start of vga memory */

+ ramoops@bc000000 {
+ 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@bf000000 {
no-map;
--
2.25.1

2020-11-19 05:24:57

by Joel Stanley

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

On Thu, 22 Oct 2020 at 01:48, Andrew Jeffery <[email protected]> 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 <[email protected]>

Reviewed-by: Joel Stanley <[email protected]>

> ---
> 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@b8000000 {
>
> /* 48MB region from the end of flash to start of vga memory */
>
> + ramoops@bc000000 {
> + 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@bf000000 {
> no-map;
> --
> 2.25.1
>