Random number generator on rpi

[Jukka A. Ukkonen]

At boot time on my RPI2...

bcmrng0: <BCM2708/2835 random number generator> mem 0x104000-0x10400f on
simplebus0

--jau



On 06/06/16 07:49, Jia-Shiun Li wrote:
> Hi all,
> 
> I occasionally found that RPi has a mysterious undocumented random number
> generator and Linux has a driver for it. [1]
> 
> Out of curiosity I wrote a simple driver according to the Linux one. It is
> simple enough for me without prior rng knowledge to make it work. Or so it
> appears. Patch is attached.
> 
> (Note you need to have the updated dtb file by copying
> {OBJDIR}/{SRCDIR}/sys/{KERNCONF}/modules/{SRCDIR}/sys/modules/dtb/rpi/rpi{,2}.dtb
> to your /boot/msdos)
> 
> Once booted the kernel will output the following line indicating it is
> working:
> 
> bcmrng0: <BCM2708/2835 random number generator> mem 0x104000-0x10400f on
> simplebus0
> 
> I only tested it on RPi2. Guess it will work fine on RPi too.
> 
> I tried to compile rndtest(4) together into the kernel, and it did not
> output or complain about anything. According to the man page this should
> mean the rng works fine, right? Or is there any other tools to verify the
> quality of a rng?
> 
> 
> [1]:
> http://scruss.com/blog/2013/06/07/well-that-was-unexpected-the-raspberry-pis-hardware-random-number-generator/
> 
> -Jia-Shiun.
> 
> 
> 
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