FreeBSD/Linux Kernel Cross Reference
sys/dev/isa/README.seagate

     #       $NetBSD: README.seagate,v 1.3 2003/05/03 18:11:25 wiz Exp $
     
     The hardware:
     
     The ST01/02, and Future Domain 950 are very simple SCSI controllers. They are
     not busmastering, so the processor must do all transfers a la IDE. They support
     blind transfer by adding wait states (up to a certain limit). Interrupt is
     generated for reconnect and parity errors (maybe also for some other events).
     
    The card consists of one command port that writes to scsi control lines, reads
    status lines, and a data port that read/writes to the 8 data lines. The address
    decoding gives both data and control ports large memory areas to a single
    port. This is used by the code.
    
    The ST01/02 differs from the FD950 in memory address location and SCSI id.
    
    Probing for the card:
    
    A card is recognized by comparing the BIOS signature with known signatures. A
    new card may not be recognized if the BIOS signature has changed. Please send
    new signatures to me.
    
    Driver function:
    
    A scsi command is sent to scsi_cmd function. The command is either placed in
    the queue or an retryable message is returned. The routine may wait for
    completion of the command depending on the supplied flags. A timer is started
    for every command placed in the queue. The commands are added in the order they
    are received. There is a possiblity to make all REQUEST SENSE commands be
    queued before all other commands, but I dont think it is a good thing (Linux
    do however use this). 
    
    The card is mostly controlled by the sea_main function. It is called by
    scsi_cmd, the interrupt routine, and the timeout routine. The sea_main routine
    runs as long there are something to do (transfer data, issue queued commands,
    and handle reconnected commands).
    
    The data transfers may be done in two different ways: Blind and polled
    transfers. They differ in the way the driver does it handshaking with the
    target. During a blind transfer, the driver code blindly transfers a block
    of data without checking for changed phase. During polled transfers, the
    phase is checked between every character transfered. The polled transfers
    are always used for status information and command transfers.
    
    Because the card does not use DMA in any way, there is no need to handle
    physical addresses. There is no problem with the isa-bus address limit of
    16MB, making bounce-buffers unnecessary.
    
    The data structures:
    
    Every card has a sea_softc structure keeping the queues of commands waiting to
    be issued, and commands currently disconnected. The type of card (Seagate or
    Future Domain), data and control port addresses, scsi id, busy flags for all
    possible targets, and interrupt vector for the card.
    
    Every scsi command to be issued are stored in a sea_scb structure. It contains
    a flag describing status/error of the command, current data buffer position,
    and number of bytes remaining to be transfered.
    
    
    PROBLEMS
    
    I have had problems getting the ST02 boot using the boot floppies. I think it
    is some problem with BIOS calls not working. It is unfortunately impossible to
    disconnect the ST02 floppy controller.
    
    I have had problem to get the driver talk to a 40 MB Seagate disk. I dont have
    access to it any more, so I can't do any more checks on that.
    
    NOTE: The ST02 creates its own description of the disk attached. This is not
    the same as the disk says. This translation problem may cause problems when
    sharing a disk between both DOS and BSD. It is however not impossible.

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