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The firmware version information contains single- and multi-function indications. Example "tstcfg.c" shows this value on the screen, and you can get this value by calling BusTools_GetRevision(). The Firmware revision contains the PROM version, single-function flag and the firmware version. The two version numbers you have show:
PROM Single firmware Version function flag version 3 1 321 - PROM version 3, single-function, firmware revision 3.21 4 0 321 - PROM version 4, multi-function, firmware revision 3.21If you attempt to run more than a single function (BC, BM, or RT) you will get a API_SINGLE_FUNCTION_ERR (231) error, "You have attempted to start multiple functions on a single function board".