From: David Woodhouse <dwmw2@infradead.org>
To: Vipin Malik <vipin.malik@daniel.com>
Cc: joakim.tjernlund@lumentis.se,
'Chris Read ' <chris.read@activesilicon.co.uk>,
mtd@infradead.org
Subject: Re: Power blackouts and brownouts
Date: Fri, 27 Apr 2001 15:34:32 +0100 [thread overview]
Message-ID: <22885.988382072@redhat.com> (raw)
In-Reply-To: <3AE98278.48DA955@daniel.com>
vipin.malik@daniel.com said:
> No, but most well designed embedded systems will assert the reset
> line both on power up AND down. Actually, direction does not really
> matter. Reset is asserted when the power rail is out of spec, which
> will happen (due to the laws of physics), both on up and down.
> You wan't the reset line asserted on power down also, else the
> processor may "wander off" into the weeds and overwrite battery backed
> RAM or other such stuff if present.
Note that 'well designed embedded systems' does _not_ include the Intel
Assabet platform. I believe nothing ever asserts the flash reset line, so if
you reset while the flash is in a mode other than read mode, the CPU's reset
vector is pointing at status words :)
The only way to fix it when you've done this is to remove power, remove the
battery, and wait for the on-board cap to run out of charge.
Fun. :)
--
dwmw2
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next prev parent reply other threads:[~2001-04-27 14:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-26 15:55 Power blackouts and brownouts Vipin Malik
2001-04-27 7:39 ` Joakim Tjernlund
2001-04-27 14:30 ` Vipin Malik
2001-04-27 14:34 ` David Woodhouse [this message]
2001-04-27 15:31 ` Vipin Malik
2001-04-27 20:37 ` David Schleef
2001-04-28 10:34 ` David Woodhouse
2001-04-28 16:00 ` sharp driver dissimilarities David Schleef
2001-04-28 16:11 ` David Woodhouse
2001-04-28 17:15 ` David Schleef
2001-04-28 17:26 ` David Woodhouse
-- strict thread matches above, loose matches on Subject: below --
2001-04-26 13:54 Power blackouts and brownouts Hicks, Jamey
2001-04-26 13:06 Chris Read
2001-04-26 15:35 ` Bari Ari
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