From: Pavel Machek <pavel@ucw.cz>
To: David Laight <David.Laight@ACULAB.COM>
Cc: "Theodore Y. Ts'o" <tytso@mit.edu>,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Ahmed S. Darwish" <darwish.07@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Nicholas Mc Guire <hofrat@opentech.at>,
the arch/x86 maintainers <x86@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Kees Cook <keescook@chromium.org>
Subject: Re: x86/random: Speculation to the rescue
Date: Wed, 9 Oct 2019 10:02:40 +0200 [thread overview]
Message-ID: <20191009080240.GA11561@amd> (raw)
In-Reply-To: <4748b43e6b00415fb21c1a127a835e87@AcuMS.aculab.com>
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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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next prev parent reply other threads:[~2019-10-09 8:02 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-28 22:24 x86/random: Speculation to the rescue Thomas Gleixner
2019-09-28 23:53 ` Linus Torvalds
2019-09-29 7:40 ` Thomas Gleixner
2019-09-29 8:05 ` Alexander E. Patrakov
2019-09-30 1:16 ` Linus Torvalds
2019-09-30 2:59 ` Linus Torvalds
2019-09-30 6:10 ` Borislav Petkov
2019-09-30 16:06 ` Linus Torvalds
2019-10-01 13:51 ` Borislav Petkov
2019-10-01 17:14 ` Linus Torvalds
2019-10-01 17:50 ` [PATCH] char/random: Add a newline at the end of the file Borislav Petkov
2019-09-30 18:05 ` x86/random: Speculation to the rescue Kees Cook
2019-09-30 3:37 ` Theodore Y. Ts'o
2019-09-30 13:16 ` Theodore Y. Ts'o
2019-09-30 16:15 ` Linus Torvalds
2019-09-30 16:32 ` Peter Zijlstra
2019-09-30 17:03 ` Linus Torvalds
2019-10-01 10:28 ` David Laight
2019-10-15 21:50 ` Thomas Gleixner
2019-10-01 16:15 ` Ahmed S. Darwish
2019-10-01 16:37 ` Kees Cook
2019-10-01 17:18 ` Ahmed S. Darwish
2019-10-01 17:25 ` Linus Torvalds
2019-10-06 12:07 ` Pavel Machek
2019-10-02 12:01 ` Theodore Y. Ts'o
2019-10-06 11:41 ` Pavel Machek
2019-10-06 17:26 ` Linus Torvalds
2019-10-06 17:35 ` Pavel Machek
2019-10-06 18:06 ` Linus Torvalds
2019-10-06 18:21 ` Pavel Machek
2019-10-06 18:26 ` Linus Torvalds
2019-10-07 11:47 ` Theodore Y. Ts'o
2019-10-07 22:18 ` Pavel Machek
2019-10-08 11:33 ` David Laight
2019-10-09 8:02 ` Pavel Machek [this message]
2019-10-09 9:37 ` David Laight
-- strict thread matches above, loose matches on Subject: below --
2019-10-01 2:14 hgntkwis
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