[ts-7000] mmap failing when trying to interface to some DIO; TS-7260

[sean machin <>]

Hi All,

I'm writing a driver which needs to interface to the digital I/O ports 
on my TS-7260.  The particular physical addresses
I need access to are 0x80840014 for a data direction register and 
0x80840004 for the data register.

It looks like my call to mmap the address 0x80840014 is failing with 
errno 22 (invalid argument).  Anyone on the
list got an idea why the call is failing?  Thanks.

--------------------------------------------------------------------------------------------------------------
    uint8_t* ddr_reg = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, 
MAP_SHARED, fd, 0x80840014);
    if (ddr_reg == MAP_FAILED) {
        syslog(LOG_ERR, "mmap failed with errno %d", errno);
    }



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