^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) What: /sys/class/watchdog/watchdogn/bootstatus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) Date: August 2015
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) Contact: Wim Van Sebroeck <wim@iguana.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) It is a read only file. It contains status of the watchdog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) device at boot. It is equivalent to WDIOC_GETBOOTSTATUS of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) ioctl interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) What: /sys/class/watchdog/watchdogn/identity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) Date: August 2015
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) Contact: Wim Van Sebroeck <wim@iguana.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) It is a read only file. It contains identity string of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) watchdog device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) What: /sys/class/watchdog/watchdogn/nowayout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) Date: August 2015
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) Contact: Wim Van Sebroeck <wim@iguana.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) It is a read/write file. While reading, it gives '1'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) if the device has the nowayout feature set, otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) it gives '0'. Writing a '1' to the file enables the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) nowayout feature. Once set, the nowayout feature
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) cannot be disabled, so writing a '0' either has no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) effect (if the feature was already disabled) or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) results in a permission error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) What: /sys/class/watchdog/watchdogn/state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) Date: August 2015
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) Contact: Wim Van Sebroeck <wim@iguana.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) It is a read only file. It gives active/inactive status of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) watchdog device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) What: /sys/class/watchdog/watchdogn/status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) Date: August 2015
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) Contact: Wim Van Sebroeck <wim@iguana.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) It is a read only file. It contains watchdog device's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) internal status bits. It is equivalent to WDIOC_GETSTATUS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) of ioctl interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) What: /sys/class/watchdog/watchdogn/timeleft
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) Date: August 2015
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) Contact: Wim Van Sebroeck <wim@iguana.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) It is a read only file. It contains value of time left for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) reset generation. It is equivalent to WDIOC_GETTIMELEFT of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) ioctl interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) What: /sys/class/watchdog/watchdogn/timeout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) Date: August 2015
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) Contact: Wim Van Sebroeck <wim@iguana.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) It is a read only file. It is read to know about current
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) value of timeout programmed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) What: /sys/class/watchdog/watchdogn/pretimeout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) Date: December 2016
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) Contact: Wim Van Sebroeck <wim@iguana.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) It is a read only file. It specifies the time in seconds before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) timeout when the pretimeout interrupt is delivered. Pretimeout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) is an optional feature.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) What: /sys/class/watchdog/watchdogn/pretimeout_avaialable_governors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) Date: February 2017
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) Contact: Wim Van Sebroeck <wim@iguana.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) It is a read only file. It shows the pretimeout governors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) available for this watchdog.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) What: /sys/class/watchdog/watchdogn/pretimeout_governor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) Date: February 2017
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) Contact: Wim Van Sebroeck <wim@iguana.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) It is a read/write file. When read, the currently assigned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) pretimeout governor is returned. When written, it sets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) the pretimeout governor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) What: /sys/class/watchdog/watchdog1/access_cs0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) Date: August 2019
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) Contact: Ivan Mikhaylov <i.mikhaylov@yadro.com>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) Alexander Amelkin <a.amelkin@yadro.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) It is a read/write file. This attribute exists only if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) system has booted from the alternate flash chip due to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) expiration of a watchdog timer of AST2400/AST2500 when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) alternate boot function was enabled with 'aspeed,alt-boot'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) devicetree option for that watchdog or with an appropriate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) h/w strapping (for WDT2 only).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) At alternate flash the 'access_cs0' sysfs node provides:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) ast2400:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) a way to get access to the primary SPI flash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) chip at CS0 after booting from the alternate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) chip at CS1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) ast2500:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) a way to restore the normal address mapping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) from (CS0->CS1, CS1->CS0) to (CS0->CS0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) CS1->CS1).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) Clearing the boot code selection and timeout counter also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) resets to the initial state the chip select line mapping. When
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) the SoC is in normal mapping state (i.e. booted from CS0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) clearing those bits does nothing for both versions of the SoC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) For alternate boot mode (booted from CS1 due to wdt2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) expiration) the behavior differs as described above.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) This option can be used with wdt2 (watchdog1) only.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) When read, the current status of the boot code selection is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) shown. When written with any non-zero value, it clears
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) the boot code selection and the timeout counter, which results
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) in chipselect reset for AST2400/AST2500.
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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