[ts-7000] TS-7800 green LED woes

["craignied" <>]

Any idea why the following isn't turning on the green LED on the TS-7800?  The 
user manual claims that the Lattice FPGA's core is at base physical address 
0xe8000000, and the green LED is bit 30 at offset 0x8 
(http://www.embeddedarm.com/about/resource.php?item=393#appendixB) ?


int main(int argc, char **argv)
{
        volatile unsigned int *start, *LED;
        int fd = open("/dev/mem", O_RDWR|O_SYNC);
        assert(fd != -1);
        
        start = (unsigned int *)mmap(0, getpagesize(), PROT_READ|PROT_WRITE, 
MAP_SHARED, fd, 0xE8000000);
        LED = (unsigned int *)(start + 0x8);
        while( 1 )
        {
                *LED = 0x40000000;
        }

        close( fd );
        return 0;
}

TIA,
Craig



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