Attached is a small cleanup of the parameter parsing in the ide driver. 
This patch replaces some of the string parsing code with get_options()
and it starts cleaning up the code that checks for specific chipsets. 

I tried to keep the chipset error checking exactly as it was before, and
now the remaining code looks a little strange.  It does something like
this:

   if (parameter is a chipset name) {
       if (chipset type is already defined for selected port)
           goto bad_option;

       if ((chipset parameter != dc4030) && (hw!=ide0) )
           goto bad_channel;

       if ((chipset parameter != dc4030) && 
            chipset type is already defined for ide1)
           goto bad_option;
   }

Can some of this be removed?  It would allow the remaining code to be
simplified..

Gerald