SD card unpartitioned space -- used for swap?

[Tiago Marques]

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
doesn't?

Best regards,
Tiago

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
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>
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