1config PSTORE 2 bool "Persistent store support" 3 default n 4 select ZLIB_DEFLATE 5 select ZLIB_INFLATE 6 help 7 This option enables generic access to platform level 8 persistent storage via "pstore" filesystem that can 9 be mounted as /dev/pstore. Only useful if you have 10 a platform level driver that registers with pstore to 11 provide the data, so you probably should just go say "Y" 12 (or "M") to a platform specific persistent store driver 13 (e.g. ACPI_APEI on X86) which will select this for you. 14 If you don't have a platform persistent store driver, 15 say N. 16 17config PSTORE_CONSOLE 18 bool "Log kernel console messages" 19 depends on PSTORE 20 help 21 When the option is enabled, pstore will log all kernel 22 messages, even if no oops or panic happened. 23 24config PSTORE_PMSG 25 bool "Log user space messages" 26 depends on PSTORE 27 help 28 When the option is enabled, pstore will export a character 29 interface /dev/pmsg0 to log user space messages. On reboot 30 data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID]. 31 32 If unsure, say N. 33 34config PSTORE_FTRACE 35 bool "Persistent function tracer" 36 depends on PSTORE 37 depends on FUNCTION_TRACER 38 depends on DEBUG_FS 39 help 40 With this option kernel traces function calls into a persistent 41 ram buffer that can be decoded and dumped after reboot through 42 pstore filesystem. It can be used to determine what function 43 was last called before a reset or panic. 44 45 If unsure, say N. 46 47config PSTORE_RAM 48 tristate "Log panic/oops to a RAM buffer" 49 depends on PSTORE 50 depends on HAS_IOMEM 51 depends on HAVE_MEMBLOCK 52 select REED_SOLOMON 53 select REED_SOLOMON_ENC8 54 select REED_SOLOMON_DEC8 55 help 56 This enables panic and oops messages to be logged to a circular 57 buffer in RAM where it can be read back at some later point. 58 59 Note that for historical reasons, the module will be named 60 "ramoops.ko". 61 62 For more information, see Documentation/ramoops.txt. 63