[ts-7000] opening /dev/mem error in sample code for TS-7800

["craignied" <>]

I'd like to compile and run a sample program on the TS-7800.  (I'd rather not 
cross compile at this point.)  I chose the "ts7800ctl.c" program at 
ftp://oz.embeddedarm.com/ts-arm-sbc/ts-7800-linux/samples/

If I compile it on the TS-7800 with

gcc ts7800ctl.c -o ts7800ctl

and then run

./ts7800ctl -n

(-n should turn on the red LED) I get the error:

ts7800ctl: ts7800ctl.c:201: main: Assertion `devmem != -1' failed.

Lines 200 and 201 are 

devmem = open("/dev/mem", O_RDWR|O_SYNC);
assert(devmem != -1);

Any idea why opening /dev/mem isn't working?  Am I compiling this wrong?

TIA,
Craig



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