John VanLoon <[EMAIL PROTECTED]> wrote:
>
> Hi,
> My controls group have decided to use RT-linux as the OS for a
large
> machine control design. The machine and control cabinet are
subjected to
> large vibration (>.5 G cont. after shock mounting) => SSD. Further
> complicating the situation the cycle time of the machine is 1/4 s.
That is
> 1 complete cycle in 1/4 second, the control is currently ~1ms and
should be
> shorter. Every cycle the machine needs to store its state incase of
power
> outage ~125 bytes of info currently. The machines run 24x7. This
would kill
> FLASH quickly. I have an Advantech PCD 892 and the documentation for
it. It
> is a SSD that can use FLASH, ROM or SRAM and provides up to 6 M of
space.
>
> I have just finished modifying the flash driver code from Diego
Roig
> Seineur and hope to have it working next week. If this works it will
be a
> good alternative / addition to a Flash Disk as it can be ROM or SRAM
also.
> SRAM is very fast so the delay in writing to disk is not there. I
will keep
> all posted of the results and submit code when I am finished.
>
Be careful of some of the SRAM board vendors. My
company was burned when a vendor completely changed
their design on us and the new board did not use
the same read/write mechanism that the old board
did. They left us twisting in the wind.
> Thanks for all the help, especially to D. Seineur for the starting
place.
> John
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