Re: flash device selection
From: linnix (me_at_linnix.info-for.us)
Date: 01/27/05
- Previous message: Bruce Edge: "flash device selection"
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Date: 27 Jan 2005 14:18:18 -0800
Bruce Edge wrote:
> I'm trying to decide on a flash device and filesystem combination for
an
> embedded device. My concerns are:
>
> - Wear leveling
> Does jffs2 wear level across partitions, or just within a partition?
> Is the M-Systems hardware leveling controller worth a damn?
> Is it preferable to using jffs2?
Wear leveling is usually done in the flash controller, regardless of
the
file system.
>
> - log data
> How to structure disk layout best to be able to get log data while
not
> significantly shortening the flash life.
If hardware allows it, use a separate (small SLC flash) for log and
everything else read-only (bigger MLC).
>
> - cost
> What's the cheapest device I can get away with.
Compact Flash is cheapest. Less than $200 for 2G.
>
> I need 1-2 GB, almost everything is static, except for log data. I
plan
> on having a log on/off switch, but I want to be able to log anomalous
> events by default.
>
> Thanks, Bruce
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