^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) What: /sys/block/*/device/sw_activity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) Date: Jun, 2008
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) KernelVersion: v2.6.27
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) Contact: linux-ide@vger.kernel.org
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) (RW) Used by drivers which support software controlled activity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) LEDs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) It has the following valid values:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) == ========================================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 0 OFF - the LED is not activated on activity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 1 BLINK_ON - the LED blinks on every 10ms when activity is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) detected.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 2 BLINK_OFF - the LED is on when idle, and blinks off
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) every 10ms when activity is detected.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) == ========================================================
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) Note that the user must turn sw_activity OFF it they wish to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) control the activity LED via the em_message file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) What: /sys/block/*/device/unload_heads
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) Date: Sep, 2008
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) KernelVersion: v2.6.28
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) Contact: linux-ide@vger.kernel.org
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) (RW) Hard disk shock protection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) Writing an integer value to this file will take the heads of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) respective drive off the platter and block all I/O operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) for the specified number of milliseconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) - If the device does not support the unload heads feature,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) access is denied with -EOPNOTSUPP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) - The maximal value accepted for a timeout is 30000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) milliseconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) - A previously set timeout can be cancelled and disk can resume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) normal operation immediately by specifying a timeout of 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) - Some hard drives only comply with an earlier version of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) ATA standard, but support the unload feature nonetheless.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) There is no safe way Linux can detect these devices, so this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) is not enabled by default. If it is known that your device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) does support the unload feature, then you can tell the kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) to enable it by writing -1. It can be disabled again by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) writing -2.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) - Values below -2 are rejected with -EINVAL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) For more information, see
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) Documentation/admin-guide/laptops/disk-shock-protection.rst
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) What: /sys/block/*/device/ncq_prio_enable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) Date: Oct, 2016
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) KernelVersion: v4.10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) Contact: linux-ide@vger.kernel.org
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) (RW) Write to the file to turn on or off the SATA ncq (native
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) command queueing) support. By default this feature is turned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) off.
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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