PC104 Memorycard?

Googeling for "pc-104" nvram reveals a lot.

first hit is http://www.embeddedarm.com/epc/ts-nvram-h.htm

-Michael

Michael Schnell schrubte am Montag, 4. Dezember 2006 14:17:


Thanks, Michael, nvram was the word i didnt guess. I was alays looking for
sram.

regards, Jens

Better yet, contact Technologic Systems (embeddedarm.com) and buy a
TS-7300 or 7400.  It comes with an SD card slot.  They also make a NVRAM
PC-104 board.  And they make a PC-104 battery backup board; just enough
power to shut down the system gracefully.

--Yan

CptDondo schrubte am Montag, 4. Dezember 2006 23:17:



Before we used to write the data to a harddisc we wrote them to a
compactflash-card. But we became massive problems with data-loss, today we
believe the reason was a combination of a bad designed ide-cf-adaptor and
the limited writecycles of flash memory. So we dont want to use any type of
flash-memory for constant data-collecting, therefore we even dont want to
use sd-cards.

The backup board would be an idea, but we will use an "ordinary" APC
Back-UPS now, which can backup some peripherals too.

The best idea i think is still the nvram-board.

regards, Jens

I think there is an issue with CF cards and powerloss that isn't there
with SD cards.  ISTR something about the CF card spec not guaranteeing
that even a flush() will write the data out and that there is an unknown
time delay in writing data.  Perhaps someone here knows more?

--Yan

Any such flash device that does internal wear leveling and bad block
relocation is bound to serious failing if power is lost just after a
write request (whenever it is performing internal housekeeping).

-Michael

 >Hi all,

 >i'm searching for a pc104-board with battery backed SRAM or something
 >similar. My problem is that a customer is building machines with an
 >linux-powered SBC, which is collecting data over 10 serial lines (another
 >pc104 board) and storing them to a harddisc. So far so good, but the users
 >of these machines cannot be argued to NOT switch off these machines without
 >shutting them down correctly. So we have always data loss, which we want to
 >avoid.

Maybe try running sync from a cron job every second or 2?

 >So now we want to put all the data into these battery backed ram and write
 >it in cycles to the harddisc.

Make sure to run sync so the write cache is flushed.