RE: AlphaStation 200 NVRAM Problem

[Robert Jarratt]

> If you post a few lines of code, someone might spot the problem. I assume
> you are getting SS$_ACCVIO as return?
> So either return_va_64 or return_length_64 wasn't passed by reference (or
> wasn't long enough but you'd have to be really lucky to pass in a 32-bit
value
> that sat at the very end of a page ...)
> 


Thanks. I have since managed to find the problem with that. But I do have a
problem that with a successful creation of the section I don't seem to be
accessing the right location. This is the code now:

        long long int startPhysicalAddress = 0x100000000;
        long long int endPhysicalAddress =   0x100100000;

        long long int regionId;
        __align (quadword) void *address;
        __align(quadword) long long int length;
        unsigned int pfn = startPhysicalAddress >> PAGE_SIZE;
        unsigned int pagesToMap = ((endPhysicalAddress -
startPhysicalAddress) >> PAGE_SIZE) + 1;
        unsigned int flags = SEC$M_EXPREG | SEC$M_PFNMAP | SEC$M_WRT;
        int status;

        regionId = VA$C_P2;
        
        status = sys$crmpsc_pfn_64(&regionId, pfn, pagesToMap, PSL$C_USER,
flags, &address, &length, 0);
        PrintStatus(status);

        flashbusIndexRegister = (unsigned int *)address;
        flashbusDataRegister = (unsigned int *)((char *)address +
(endPhysicalAddress - startPhysicalAddress));

If I try to write to the index register by dereferencing
flashbusIndexRegister the machine dies.

Regards

Rob