If you are using the real-time clock option, they do have a small area of non-volatile memory you can write to. Thus, when you could write a serial number of device code, and then at run time, verify that the SD card is compatible with the board. On making it so you can not change the SD card, there is the little switch you can flip, but of course a user could flip it back if he had physical access. I suppose you could put a dab of super glue, or maybe even physically break off the little plastic piece after setting it to read-only, but of course if you ever want to re-program it . . . . .
On the other hand, you can always mount the SD card read-only, and do some sort of a check sum of the various files at start up, and stop the program if it has been modified on another computer.
Don.
On 1/24/07, Yan Seiner <> wrote:
I know very little about the security features of SD cards.
We are using the TS7xx0 boards for control of some pretty big
equipment, and would like to make sure that people won't change the
programming.
>From what I understand, it is possible to lock the SD card so that its
contents cannot be modified. Is that correct? How does one go about
that?
And the second question: Is it possible to "version" the cards so
that card with program "A" cannot be used on a machine that requires
program "B"? In other words, I want to restrict certain cards to only
operate on certain boards. Is there some sort of serial number on the
TS-7300 board that can be read? Or some way to distinguish from one
board to the next?
--Yan
-- Dr. Don W. Carr J. G. Montenegro 2258 Guadalajara, Mexico +52-333-630-0704 +52-333-836-4500 ext 2930
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