http://neil.franklin.ch/Projects/VirtexTools/Options
  - options, what is being used, for what, and where
author Neil Franklin, last modification 2003.09.17

[] = planned
[]? = possible/unlikely

options:

-a vv: ascii
-b [BRAMs/BRAMdatas (instead of CLBs/LUTs)]?
-c [CLBs/LUTs (instead of BRAMs/BRAMdatas)]? or only -t
-d [data dump/view mode (now normal mode)]? or only -t
-e entire dump/view mode
-f [vd: file header data]
   vv(-e): folded layout
   [vm: edit cmd file]
-g [vd(-n): guess logic and char of LUT]?
   [vv(-e): geometry layout, instead of -t]
-h help
-i
-j
-k [vm: outfile keep infile time]
-l long headers
-m vd: memory dump mode
-n normal dump/view mode
   or [null/zero bitfile generate]
-o output file
   or [vd: stream header option data]
-p vv: paint
-q quiet headers
-r range
   or [vd: reverse-row]?
   or [vv: rotate-pic]?
   or [routing]? (conflict!)
-s short headers
-t vd(-n/-m/-z)|vm(-n/-m/-z): type of base for data/mem
   vd(-e)|vv(-e)|vm(-e): tile type(s)
   or vv(-e): true layout (conflict -> -g)
-u
-v verbose operation
-w
-x [vd/vm: XDL format]?
-y
-z vd: zigzag mode
   or [vd(-m): zigzag slices -z=2 -zz=4 -zzz=8], vv: zoom
   vv: zoom
-0 [zero/null bitfile generate]
-1 [vd(-bm): width of BRAMs 1]
-2 [vd(-bm): width of BRAMs 2] [vd(-cm): RAM size of LUTs (3)2]
-3
-4 [vd(-bm): width of BRAMs 4]
-5
-6 [vd(-bm): width of BRAMs 8]
-7
-8 [vd(-bm): width of BRAMs (1)6] [vd(-cm): RAM size of LUTs (1)6]
-9

parameters:

bitstream-filename