reserved-memory {

　　#address-cells = <2>;

　　#size-cells = <2>;

　　ranges;

　　reg = <0x50008000 0x100000>;

　　reg-names = "reserved-memory ";

};

ramoops {

　　compatible = "ramoops ";

　　record-size = <0x0 0x20000>;

　　console-size = <0x0 0x20000>;

　　ftrace-size = <0x0 0x20000>;

　　pmsg-size = <0x0 0x20000>;

　　memory-region = <&reserved-memory>;

　　status = "okay";

};

config PSTORE

tristate "Persistent store support"

select CRYPTO if PSTORE_COMPRESS

default n

help

   This option enables generic access to platform level

   persistent storage via "pstore" filesystem that can

   be mounted as /dev/pstore.  Only useful if you have

   a platform level driver that registers with pstore to

   provide the data, so you probably should just go say "Y"

   (or "M") to a platform specific persistent store driver

   (e.g. ACPI_APEI on X86) which will select this for you.

   If you don't have a platform persistent store driver,

   say N.

config PSTORE_CONSOLE

bool "Log kernel console messages"

depends on PSTORE

help

  When the option is enabled, pstore will log all kernel

  messages, even if no oops or panic happened.

config PSTORE_PMSG

bool "Log user space messages"

depends on PSTORE

help

  When the option is enabled, pstore will export a character

  interface /dev/pmsg0 to log user space messages. On reboot

  data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID].

  If unsure, say N.

config PSTORE_FTRACE

bool "Persistent function tracer"

depends on PSTORE

depends on FUNCTION_TRACER

depends on DEBUG_FS

help

  With this option kernel traces function calls into a persistent

  ram buffer that can be decoded and dumped after reboot through

  pstore filesystem. It can be used to determine what function

  was last called before a reset or panic.

  If unsure, say N.

config PSTORE_RAM

tristate "Log panic/oops to a RAM buffer"

depends on PSTORE

depends on HAS_IOMEM

depends on HAVE_MEMBLOCK

select REED_SOLOMON

select REED_SOLOMON_ENC8

select REED_SOLOMON_DEC8

help

  This enables panic and oops messages to be logged to a circular

  buffer in RAM where it can be read back at some later point.

  Note that for historical reasons, the module will be named

  "ramoops.ko".

  For more information, see Documentation/admin-guide/ramoops.rst.

选项

Kconfig选项

含义

PSTORE_CONSOLE

Log kernel console messages

内核日志信息

PSTORE_PMSG

Log user space messages

用户日志信息

PSTORE_FTRACE

Persistent function tracer

函数调用关系

PSTORE_RAM

Log panic/oops to a RAM buffer"

内核崩溃或错误日志

# SPDX-License-Identifier: GPL-2.0

#

# Makefile for the linux pstorefs routines.

#

obj-$(CONFIG_PSTORE) += pstore.o

pstore-objs += inode.o platform.o

pstore-$(CONFIG_PSTORE_FTRACE) += ftrace.o

pstore-$(CONFIG_PSTORE_PMSG) += pmsg.o

ramoops-objs += ram.o ram_core.o

obj-$(CONFIG_PSTORE_RAM) += ramoops.o

dmesg | grep -i pstore

dmesg | grep -i ramoops

cd /sys/fs/pstore

reboot

echo c > /proc/sysrq-trigger

echo 1 > /proc/sys/kernel/sysrq