What happens to the /A in vPortCapStrings "/VP0CAPTURE/A/0"

Hi

I am using the DM648 EVM and can't figure out what code strips of the "/A" in "/VP0CAPTURE/A/0". The example I am looking at is psp_bios_vport_sd_loopback.c. The code sets up the cap strings for each port:

    Int8        *vPortCapStrings[MAX_CAP_CHAN] =
    {
        "/VP0CAPTURE/A/0",   // Created in dm648_vport0.tci
        "/VP0CAPTURE/B/1",
        "/VP2CAPTURE/A/2",
        "/VP2CAPTURE/B/3",
        "/VP3CAPTURE/A/4",
        "/VP3CAPTURE/B/5",
        "/VP4CAPTURE/A/6",
        "/VP4CAPTURE/B/7"
    };

and then in tvp5154.c: TVP5154_open(), it parses only the "/" and "0" of the string.

    /* Check if the address is correct */
    if (devName[0] != '/')
    {
        handle = (_TVP5154_chanObj *)NULL;
    }
    else
    {
        chanNum = (Int32)(devName[1] - '0');
        /* assigning channel object structure */

What ate the "/A" and "/B"? Is that part of the BIOS code that is not available to view?

Thanks