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Re: [ts-7000] Best Practices for SD Cards Embedded Systems

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Subject: Re: [ts-7000] Best Practices for SD Cards Embedded Systems
From: Jim Jackson <>
Date: Sun, 13 Jul 2008 20:50:27 +0100 (BST)

> The selection of the 7400 was based on having the resources provided
> by a full debian distribution (not TSLinxu). So if
> I can't reliably boot from SD Card given inadvertent power cycles,
> then its not a viable platform for me.

This seems like a non-seuqitor. Do you think that a Debian Linux 
distribution would give you ability to reliably boot given inadvertant 
power cycles? Because it won't. Most "normal" linux setups barf if randomly 
restarted, especially in restarted during file system repair. And I doubt 
if any writable filesystem can guarantee NOT to fail under the conditions 
you indicate.

It sounds like you need battery backup, and main power detection,
so that you can arrange to have long enough to shut down cleanly.

Having the main OS partititon(s) read only with volatile ramdisks for the 
variable data is probably only foolproof way I can think of, without extra 
hardware. If you have networik connectivity, you could use nfs, with sync 
writes, to a server for storing any variable data.

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