Re: Power On Self Test

From	Paul Rubin <no.email@nospam.invalid>
Newsgroups	comp.arch.embedded
Subject	Re: Power On Self Test
Date	2020-09-23 13:05 -0700
Organization	A noiseless patient Spider
Message-ID	<87ft78cl8g.fsf@nightsong.com> (permalink)
References	(2 earlier) <rkfe4s$cr2$1@dont-email.me> <MxHaH.188336$bQ4.128690@fx04.iad> <rkfkio$pfs$1@dont-email.me> <rkftj5$rod$1@dont-email.me> <rkg64r$qaf$1@dont-email.me>

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David Brown <david.brown@hesbynett.no> writes:
> When you design a system based on a microcontroller, you pick a device
> that is as reliable as you need it to be

That might not exist.  E.g. it's common for security processors and
software to continuously self-test while running, since the user might
be trying to tamper with them.  "Differential fault analysis" is a
relevant search string.  The attacker does stuff like intentionally
overclock the processor in the hope of introducing errors, so they can
observe the difference between the error result and the normal result,
and infer stuff about the supposedly-secured info inside the processor.
There is no magic way to defeat these attacks, but the cpu designers do
what they can.

Thread

Power On Self Test pozz <pozzugno@gmail.com> - 2020-09-23 12:13 +0200
  Re: Power On Self Test Don Y <blockedofcourse@foo.invalid> - 2020-09-23 03:57 -0700
    Re: Power On Self Test David Brown <david.brown@hesbynett.no> - 2020-09-23 14:13 +0200
      Re: Power On Self Test Richard Damon <Richard@Damon-Family.org> - 2020-09-23 08:51 -0400
        Re: Power On Self Test David Brown <david.brown@hesbynett.no> - 2020-09-23 16:03 +0200
          Re: Power On Self Test Don Y <blockedofcourse@foo.invalid> - 2020-09-23 09:36 -0700
            Re: Power On Self Test David Brown <david.brown@hesbynett.no> - 2020-09-23 21:02 +0200
              Re: Power On Self Test Don Y <blockedofcourse@foo.invalid> - 2020-09-23 12:32 -0700
                Re: Power On Self Test David Brown <david.brown@hesbynett.no> - 2020-09-24 11:10 +0200
                Re: Power On Self Test Don Y <blockedofcourse@foo.invalid> - 2020-09-24 04:11 -0700
                Re: Power On Self Test David Brown <david.brown@hesbynett.no> - 2020-09-24 13:58 +0200
                Re: Power On Self Test Don Y <blockedofcourse@foo.invalid> - 2020-09-24 07:09 -0700
                Re: Power On Self Test Dave Nadler <drn@nadler.com> - 2020-10-02 17:29 -0700
                Re: Power On Self Test David Brown <david.brown@hesbynett.no> - 2020-10-03 18:22 +0200
                Re: Power On Self Test Dave Nadler <drn@nadler.com> - 2020-10-03 09:27 -0700
                Re: Power On Self Test David Brown <david.brown@hesbynett.no> - 2020-10-04 12:48 +0200
                Re: Power On Self Test Don Y <blockedofcourse@foo.invalid> - 2020-10-03 12:08 -0700
              Re: Power On Self Test Paul Rubin <no.email@nospam.invalid> - 2020-09-23 13:05 -0700
                Re: Power On Self Test David Brown <david.brown@hesbynett.no> - 2020-09-24 11:15 +0200
          Re: Power On Self Test Richard Damon <Richard@Damon-Family.org> - 2020-09-23 21:55 -0400
            Re: Power On Self Test David Brown <david.brown@hesbynett.no> - 2020-09-24 11:26 +0200
              Re: Power On Self Test Richard Damon <Richard@Damon-Family.org> - 2020-09-24 09:01 -0400
                Re: Power On Self Test David Brown <david.brown@hesbynett.no> - 2020-09-24 16:21 +0200
  Re: Power On Self Test Mike Perkins <spam@spam.com> - 2020-09-23 23:13 +0100
    Re: Power On Self Test pozz <pozzugno@gmail.com> - 2020-09-24 09:18 +0200
      Re: Power On Self Test Mike Perkins <spam@spam.com> - 2020-09-30 15:14 +0100

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