• Need advice to write a SBF driver

    From Ralf Kiefer@21:1/5 to All on Thu Nov 22 21:39:48 2018

    OS-9/68k, v2.4.5 .. v3.1, opened Technical I/O Manual (November 1993),
    without any template for a simple sbf driver (written in Assembler), but
    I wish I have one :-)

    I've got some problems with my own empty framework.

    What I've done: there is an empty driver framework, means Init, Read,
    Write, PutStat, GetStat, and Terminate each returning carry bit cleared
    and d1.w = 0. Init does this:
    move.w #1,SBF_NDrv(a2)
    and it really does. Nothing else at the moment.

    There is a vsect with the driver's code:
    org $0030
    SBF_NDrv: do.w 1 number of drives
    SBF_Flag: do.w 1 driver flags
    SBF_Drvr: do.l 1 driver module ptr
    SBF_DPrc: do.l 1 driver process ptr
    SBF_IPrc: do.l 1 interrupt process ptr

    The linker command:
    l68 $(LDIR)/sbfstat.r $(LDIR)/sbfdrvtb.r [...]

    After loading the modules I set some breakpoints to the six standard
    driver entries.

    With "iniz /mt0" the first breakpoint is reached. IOMan jumps to "Init"
    of my driver. Than my device seems to be active according to the "devs" command. I can type in "deiniz /mt0", stop at the breakpoint at
    "Terminate" in my driver and than my new device disappears from the
    "devs" list. That's ok until now.

    But that's it. The sbf will never jump to Read, Write, GetStat, or
    PutStat: Error: 0:240 (Illegal Unit (drive) number).

    In "Init" the driver's static storage seems to be ok, means just
    starting with my port address and nothing else except a lot of '0's.

    Any idea? I just want to get an unbuffered SBF device, no interrupts, no additional process to control a tape, no signals, ...


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