SD card unpartitioned space -- used for swap?
tiagomnm at gmail.com
Sun Dec 5 19:30:52 EST 2010
That's strange, wherever I have used flash memory to serve as boot drive,
the kernel/userspace waits for the writes to be complete before powering
down. I have not experienced corruption that looks anything similar to
what's described. So the software is thinking it has written it but it
On Wed, Nov 24, 2010 at 2:53 PM, Richard A. Smith <richard at laptop.org>wrote:
> On 11/22/2010 07:20 PM, James Cameron wrote:
> >> Also, I'm not familiar with "evil keepout time". But note that on the
> >> new XO-1 F14 build, the "shutdown" time-lapse is only a few seconds.
> >> If actually 30s are needed to keep the SD circuitry happy, perhaps a
> >> delay (and a Release Notes explanation) should be added to the OLPC.
> > I suspect the "evil keepout time" is the time after the last write
> > request to the card and the removal of power. It is why current XO-1.5
> > EC firmware blinks the power LED for some seconds on power off.
> Its 3 seconds and only active for internal uSD. You need really new 1.5
> firmware to have this delay.
> If you are running on external SD there is at least one 8 gig card with
> a flash controller (which could be in multiple different cards) that
> will become completely unusable if you power it off less than 2 seconds
> or so from the last write. I recommend you do hard power offs little as
> possible. Suspend/resume also should be disabled.
> Richard A. Smith <richard at laptop.org>
> One Laptop per Child
> Devel mailing list
> Devel at lists.laptop.org
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