linux-kernel - Re: [RFC PATCH 0/5] CPU Jitter RNG

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Date:	Tue, 4 Feb 2014 20:39:34 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"Theodore Ts'o" <tytso@....edu>, "H. Peter Anvin" <hpa@...or.com>,
	Stephan Mueller <smueller@...onox.de>,
	Jörn Engel <joern@...fs.org>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>, dave.taht@...il.com,
	John Crispin <blogic@...nwrt.org>, andrewmcgr@...il.com,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Thorsten Glaser <tg@...bsd.de>, sandyinchina@...il.com
Subject: Re: [RFC PATCH 0/5] CPU Jitter RNG

On Tue, Feb 4, 2014 at 8:23 PM,  <tytso@....edu> wrote:
> However, where a decade ago the ethernet card probably had its own
> independent clock crystal/oscillator, I'm going to guess that these
> days with SOC's and even on laptops, with ethernet device part of the
> chipset, it is probably being driven off the same master oscillator.

USB typically still has its own crystal.

> I wonder if there's anyway we can either figure out manually, or
> preferably, automatically at boot time, which devices actually have
> independent clock oscillators.

You may find this information in the DT on some platforms (if you're
lucky).

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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