linux-kernel - Re: [PATCH] hwrng: Add TX4939 RNG driver

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Message-Id: <20090601.021807.250571902.anemo@mba.ocn.ne.jp>
Date:	Mon, 01 Jun 2009 02:18:07 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	mpm@...enic.com
Cc:	akpm@...ux-foundation.org, linux-mips@...ux-mips.org,
	ralf@...ux-mips.org, linux-kernel@...r.kernel.org,
	herbert@...dor.apana.org.au
Subject: Re: [PATCH] hwrng: Add TX4939 RNG driver

On Sun, 31 May 2009 12:00:09 -0500, Matt Mackall <mpm@...enic.com> 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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