From 6fcf63c988765bdcc45a477cd34f6a057b6c62d4 Mon Sep 17 00:00:00 2001 From: deraadt Date: Wed, 22 Nov 1995 15:39:52 +0000 Subject: [PATCH] go away --- sys/dev/isa/README.seagate | 70 -------------------------------------- 1 file changed, 70 deletions(-) delete mode 100644 sys/dev/isa/README.seagate diff --git a/sys/dev/isa/README.seagate b/sys/dev/isa/README.seagate deleted file mode 100644 index 9b8a8a8b699..00000000000 --- a/sys/dev/isa/README.seagate +++ /dev/null @@ -1,70 +0,0 @@ -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. -- 2.20.1