which is the correct salt file format?

[tlc]

Ok. I borrowed an AMD HD 5550 video card, so now I can use oclHashcat.
Please advise how the proper command line should look in order to crack this one:
- a SHA256 hash (such as CAE201A8B791CA25B81B04876CACD62897883EE4C1907D2BD51D5671FEEC7562)
- with an appended salt of Hex value 00 00 00 00 00 00 00 00 (8 bytes with 0 ASCII value)
- with decimal charset
- password length: 8 chars

How should I specify the above-mentioned salt to the program? I can only find the --hex-salt option, but no parameter to feed the salt...

thank you