devices.txt: improve entry for comedi (char major 98) (d62e8055) · Commits · 戴 / test

Describe how the comedi minor device numbers are split across comedi devices and comedi subdevices. Replace the current, long dead URL with an official URL for the Comedi project. Signed-off-by:

Ian Abbott <abbotti@mev.co.uk> Signed-off-by:

Jonathan Corbet <corbet@lwn.net>

Documentation/admin-guide/devices.txt

+10 −1

Original line number	Diff line number	Diff line
		@@ -1647,8 +1647,17 @@
		0 = /dev/comedi0 First comedi device
		1 = /dev/comedi1 Second comedi device
		...
		47 = /dev/comedi47 48th comedi device

		See http://stm.lbl.gov/comedi.
		Minors 48 to 255 are reserved for comedi subdevices with
		pathnames of the form "/dev/comediX_subdY", where "X" is the
		minor number of the associated comedi device and "Y" is the
		subdevice number. These subdevice minors are assigned
		dynamically, so there is no fixed mapping from subdevice
		pathnames to minor numbers.

		See http://www.comedi.org/ for information about the Comedi
		project.

		98 block User-mode virtual block device
		0 = /dev/ubda First user-mode block device

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