We're still in the R&D phase and have to send a bunch out to customers so I
needed more space than what was available on the internal flash. What I
ended up doing was leaving the SD card as ext3 but mounting it read-only
using aufs to have a ramdisk overlay on the drive that was read-write. Think
of it as something like the live cdroms from Ubuntu and others. I still
have commands that allow me to mount it read-write while it's booted up
and change things here and there but then I can switch it back to read-only.
It's not perfect as you're limited to changes on the ramdisk being no more
than the space you have allocated to it but it's worked almost perfectly and
we haven't worried at all about spontaneous shutdowns.
I'm not actually using the flash at the moment but I have a goal of setting
it up with yaffs or jffs2 and using it as a writeable preferences partition
unique to each individual box
If you're interested I can supply more details when I get a chance
--
Matthew Harrell
Bit Twiddlers, Inc.
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