Is there a way to enable ramoops on RK3588(s)?

[jjm2473]

I want to enable ramoops to make it easier to check logs after a kernel crash.

I tried adding the following code to the DTS of a FriendlyARM NanoPi R6C and recompiling it, and I also installed kmod-ramoops:

	reserved-memory {
		#address-cells = <2>;
		#size-cells = <2>;
		ranges;

		ramoops: ramoops@110000 {
			compatible = "ramoops";
			reg = <0 0x110000 0 0xe0000>;
			console-size = <0x80000>;
			ftrace-size = <0x00000>;
			pmsg-size = <0x30000>;
			record-size = <0x14000>;
		};
	};

The kernel logs at startup are as follows:

[    9.441951] pstore: Using crash dump compression: deflate
[    9.442426] printk: console [ramoops-1] enabled
[    9.443210] pstore: Registered ramoops as persistent store backend
[    9.443746] ramoops: using 0xe0000@0x110000, ecc: 0

However, after rebooting, mounting the pstore (mount -o noatime -t pstore pstore /sys/fs/pstore) shows that /sys/fs/pstore is empty. Even after triggering a crash using echo c > /proc/sysrq-trigger, /sys/fs/pstore remains empty after rebooting.

Does anyone know what happened?

(I test it under OpenWrt 24.10.4)

[brada4]

bootloader initialized RAM?

[jjm2473]

The official u-boot for FriendlyARM NanoPi R6C in OpenWrt 24.10.4

[jjm2473]

Resolved.

The reset mode of the RK806 PMIC needs to be adjusted.

1. Linux backport this commit https://github.com/torvalds/linux/commit/db8db85cff331eb5a520a18a606692ff85405c3d
2. R6C DTS add

      &rk806_single {
      	rockchip,reset-mode = <1>;
      };
   

[brada4]

Consider submitting backport to v6.12 at least....

[jjm2473]

Backporting the driver patch is simple, but many DTS files have their own RK806 configurations (mainly RK3576 and RK3588 SoCs).