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Commit e9e23158 authored by Lee Jones's avatar Lee Jones Committed by Herbert Xu
Browse files

hwrng: doc - Fix device node name reference /dev/hw_random => /dev/hwrng 



In April 2009, commit d4056405 ("Driver Core: misc: add node name support
for misc devices.") inadvertently changed the device node name from
/dev/hw_random to /dev/hwrng.  Since 6 years has passed since the change
it seems unpractical to change it back, as this node name is probably
considered ABI by now.  So instead, we'll just change the documentation
to match the current situation.

NB: It looks like rng-tools have already been updated.

Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
Acked-by: default avatarKieran Bingham <kieranbingham@gmail.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 4dd17c9c

Documentation/hw_random.txt

+4 −4
Original line number Diff line number Diff line
@@ -3,7 +3,7 @@ Introduction: 
	The hw_random framework is software that makes use of a

	special hardware feature on your CPU or motherboard,

	a Random Number Generator (RNG).  The software has two parts:

	a core providing the /dev/hw_random character device and its

	a core providing the /dev/hwrng character device and its

	sysfs support, plus a hardware-specific driver that plugs

	into that core.
@@ -14,7 +14,7 @@ Introduction: 


		http://sourceforge.net/projects/gkernel/



	Those tools use /dev/hw_random to fill the kernel entropy pool,

	Those tools use /dev/hwrng to fill the kernel entropy pool,

	which is used internally and exported by the /dev/urandom and

	/dev/random special files.
@@ -32,13 +32,13 @@ Theory of operation: 
	The rng-tools package uses such tests in "rngd", and lets you

	run them by hand with a "rngtest" utility.



	/dev/hw_random is char device major 10, minor 183.

	/dev/hwrng is char device major 10, minor 183.



	CLASS DEVICE.  There is a /sys/class/misc/hw_random node with

	two unique attributes, "rng_available" and "rng_current".  The

	"rng_available" attribute lists the hardware-specific drivers

	available, while "rng_current" lists the one which is currently

	connected to /dev/hw_random.  If your system has more than one

	connected to /dev/hwrng.  If your system has more than one

	RNG available, you may change the one used by writing a name from

	the list in "rng_available" into "rng_current".