linux-kernel - Re: x86/random: Speculation to the rescue

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Message-ID: <20191009080240.GA11561@amd>
Date:   Wed, 9 Oct 2019 10:02:40 +0200
From:   Pavel Machek <pavel@....cz>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     "Theodore Y. Ts'o" <tytso@....edu>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Ahmed S. Darwish" <darwish.07@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Nicholas Mc Guire <hofrat@...ntech.at>,
        the arch/x86 maintainers <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: x86/random: Speculation to the rescue

Hi!

> > I have many systems including SoC here, but technology needed for NAND
> > flash is different from technology for CPU, so these parts do _not_
> > share a silicon die. They do not even share same package. (Also RTC
> > tends to be on separate chip, connected using i2c).
> 
> NAND flash requires ECC so is likely to be async.
> But I2C is clocked from the cpu end - so is fixed.

RTC i2c may be clocked from the CPU end, but the time source needs to
work when machine is off, so that has a separate crystal for
timekeeping.


> Also an embedded system could be booting off a large serial EEPROM.
> These have fixed timings and are clocked from the cpu end.

Have you seen such system running Linux?

Best regards,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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