Hi.
Looking for advice. I have been using the TS7250 for a couple of years, with
about 50 out in the field. I use a few bytes in the NVRAM chip that is part of
the RTC to store tiny amounts of data that I want to preserve across power
outages (planned or unplanned). Every minute or so I write the latest highest
value into a pair of bytes. I don't think there is a risk of NVRAM wearing
out. The usual downside to NVRAM is that it slow to write to and small in
capacity, I think.
I want to move to the new TS7500. This does not have a NVRAM driver although
it has an RTC as option. Access to the RTC is via a userland program. I think
the bootup sequence reads the RTC to set the kernel time and date.
Should I try and get an NVRAM driver for 2.6, or use a file in the filesystem
(on the SDCARD) to preserve my state information?
In order to minimise the risk of Flash wearout should my program
open/write/close a small file each time, or open/write/flush and keep open the
same file?
I did ask Technologic some time ago and got a deafening silence in response. I
will go and hassle them again, but I hoped this group might have some words of
wisdom.
Martin
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