NetBSD/sys/arch/i386/isa
mycroft fcdbd2bd7b Remove outdated comment. 1995-01-16 10:36:26 +00:00
..
ic new RCS ID format. 1994-10-27 04:14:23 +00:00
pcvt Add interrupt sharing types. 1995-01-03 03:56:09 +00:00
README.seagate Commit this, though it really does need work. 1994-11-03 16:55:57 +00:00
aha1542.c Simplify some sanity checks. 1995-01-13 14:46:44 +00:00
aic6360.c Simplify some sanity checks. 1995-01-13 14:46:44 +00:00
ast.c Fix oversight in previous. 1995-01-04 00:47:53 +00:00
boca.c Fix oversight in previous. 1995-01-04 00:47:53 +00:00
bsd_audiovar.h new RCS ID format. 1994-10-27 04:14:23 +00:00
bt742a.c Simplify some sanity checks. 1995-01-13 14:46:44 +00:00
clock.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
clock.h new RCS ID format. 1994-10-27 04:14:23 +00:00
clockreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
com.c Explicitly test the RXRDY status bit on incoming characters. 1995-01-11 09:56:40 +00:00
comreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
cy.c be more careful with types, also pull in headers where necessary. 1994-10-30 21:43:03 +00:00
debug.h new RCS ID format. 1994-10-27 04:14:23 +00:00
dma.c Convert port, IRQ, and DRQ numbers to ints. 1994-11-18 22:07:32 +00:00
dmareg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
dmavar.h new RCS ID format. 1994-10-27 04:14:23 +00:00
elink.c Actually, do the ID reset in elink_reset(). 1995-01-07 21:37:54 +00:00
elink.h new RCS ID format. 1994-10-27 04:14:23 +00:00
fd.c Oops. 1995-01-13 14:05:17 +00:00
fdreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
icu.h Make IRQ_SLAVE a plain number, too, and remove IRQ{0-15}. 1994-11-04 19:13:49 +00:00
icu.s Avoid using btrl, and check astpending before the return cs, because it's 1995-01-15 00:36:37 +00:00
if_ed.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
if_edreg.h Use soft configuration where possible. 1995-01-02 20:32:55 +00:00
if_eg.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
if_egreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
if_el.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
if_elreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
if_ep.c Actually, do the ID reset in elink_reset(). 1995-01-07 21:37:54 +00:00
if_epreg.h 3c509 fixes to avoid adapter getting stuck in high traffic conditions. 1994-12-10 14:52:02 +00:00
if_hp.c be more careful with types, also pull in headers where necessary. 1994-10-30 21:43:03 +00:00
if_ie.c Actually, do the ID reset in elink_reset(). 1995-01-07 21:37:54 +00:00
if_ie507.h new RCS ID format. 1994-10-27 04:14:23 +00:00
if_ieatt.h new RCS ID format. 1994-10-27 04:14:23 +00:00
if_le.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
if_lereg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
intr.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
isa.c Remove outdated comment. 1995-01-16 10:36:26 +00:00
isareg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
isavar.h Update intr_establish() prototype. 1995-01-03 03:14:35 +00:00
kbdreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
lms.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
lpt.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
lptreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
mcd.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
mcdreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
mms.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
npx.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
nvram.h new RCS ID format. 1994-10-27 04:14:23 +00:00
pccons.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
pms.c Don't issue a controller self-test... 1995-01-07 22:48:29 +00:00
rtc.h new RCS ID format. 1994-10-27 04:14:23 +00:00
rtfps.c Fix oversight in previous. 1995-01-04 00:47:53 +00:00
sb.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
sbreg.h Check IRQ 9, not IRQ 2. 1994-11-15 00:00:24 +00:00
seagate.c Simplify some sanity checks. 1995-01-13 14:46:44 +00:00
spkr.c be more careful with types, also pull in headers where necessary. 1994-10-30 21:43:03 +00:00
spkrreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
timerreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00
ultra14f.c Simplify some sanity checks. 1995-01-13 14:46:44 +00:00
vector.s Remove Xwild; it's no longer used. 1994-11-18 22:22:40 +00:00
wd.c (Almost) allow sector sizes other than 512 bytes. Reduce some expensive operations. 1995-01-13 12:30:59 +00:00
wd7000.c Convert port, IRQ, and DRQ numbers to ints. 1994-11-18 21:57:40 +00:00
wdreg.h Forgot to commit this as part of the LBA changes. 1994-11-23 07:56:52 +00:00
wt.c Add interrupt sharing types. 1995-01-03 01:30:14 +00:00
wtreg.h new RCS ID format. 1994-10-27 04:14:23 +00:00

README.seagate

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.