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Re: [PATCH] hwrng: Add TX4939 RNG driver

Subject: Re: [PATCH] hwrng: Add TX4939 RNG driver
From: Atsushi Nemoto <>
Date: Mon, 01 Jun 2009 02:18:07 +0900 (JST)
In-reply-to: <1243789210.22069.23.camel@calx>
Original-recipient: rfc822;
References: <> <> <1243789210.22069.23.camel@calx>
On Sun, 31 May 2009 12:00:09 -0500, Matt Mackall <> wrote:
> > >From the datasheet:
> > 
> >     The quality of the random numbers generated immediately after
> >     reset can be insufficient.  Therefore, do not use random
> >     numbers obtained from the first and second generations; use
> >     the ones from the third or subsequent generation.
> Does the datasheet say anything about -how- the random numbers are
> produced? Most physical sources that I'm aware of don't have this sort
> of issue. But some pseudo-RNGs do. So this looks a little worrisome.

Nothing for "how".  If a RNG was actually a pseudo-RNG, does anything
a driver should do?  Any future plan to select one RNG from multiple
sources based on randomness grade?

Atsushi Nemoto

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