This pr (#1409)  needs to be fixed before we gent into full release mode
(*very* soon).  Can someone update the status of this for me?  Are some
of the people working on the sbic.c dealing with this?

>Description:

        After a short period of normal activity, the system hangs,
        finally falling into the Debugger with:

        sbicwait TIMEO @972 asr=x20 csr=xff

        The asr code is: no data ready, no parity error, no command in
        progress, not level II command busy, last command ignored (a
        command was issued by the host just prior or concurrent with a
        pending interrupt, and therefore the command will be ignored),
        no interrupt pending.

        "trace" says (modulo typos; I really need a polaroid + scanner
        for this work):

        Debugger(95e32, 20, ff, 1000)+6
        sbicwait(2e50041, c0, 0, 3cc, 1011)+5c
        sbicselectbus(53f400, 2e50041, 0, 0, 0)+f0
        sbicgo(53f400, 57d780)+aa
        sbic_sched(53f400, 1b, 80,80,1b)+148
        sbicnextstate(53f400, 1b, 80)+29a
        sbicintr(53f400, 8, 53f424, 5a3300, dd1ecc)+58
        ahsc_dmaintr(53f400)+64
        intrhand(2200)+64
        lev2intr(?)
        mi_switch(...)
        tsleep(...)
        getblk(...)
        bread(...)
        ffs_update(...)
        ffs_fsync(...)
        ffs_sync(...)
        sync(...)
        syscall(...)
        trap0(...)


>How-To-Repeat:
        Build kernel, boot it, log in, start screen... what? it still works?


Chris.