mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-04 17:06:48 +07:00
44 lines
1.9 KiB
Plaintext
44 lines
1.9 KiB
Plaintext
|
README file for the Linux DTC3180/3280 scsi driver.
|
||
|
|
by Ray Van Tassle (rayvt@comm.mot.com) March 1996
|
||
|
|
Based on the generic & core NCR5380 code by Drew Eckhard
|
||
|
|
|
||
|
|
SCSI device driver for the DTC 3180/3280.
|
||
|
|
Data Technology Corp---a division of Qume.
|
||
|
|
|
||
|
|
The 3280 has a standard floppy interface.
|
||
|
|
|
||
|
|
The 3180 does not. Otherwise, they are identical.
|
||
|
|
|
||
|
|
The DTC3x80 does not support DMA but it does have Pseudo-DMA which is
|
||
|
|
supported by the driver.
|
||
|
|
|
||
|
|
It's DTC406 scsi chip is supposedly compatible with the NCR 53C400.
|
||
|
|
It is memory mapped, uses an IRQ, but no dma or io-port. There is
|
||
|
|
internal DMA, between SCSI bus and an on-chip 128-byte buffer. Double
|
||
|
|
buffering is done automagically by the chip. Data is transferred
|
||
|
|
between the on-chip buffer and CPU/RAM via memory moves.
|
||
|
|
|
||
|
|
The driver detects the possible memory addresses (jumper selectable):
|
||
|
|
CC00, DC00, C800, and D800
|
||
|
|
The possible IRQ's (jumper selectable) are:
|
||
|
|
IRQ 10, 11, 12, 15
|
||
|
|
Parity is supported by the chip, but not by this driver.
|
||
|
|
Information can be obtained from /proc/scsi/dtc3c80/N.
|
||
|
|
|
||
|
|
Note on interrupts:
|
||
|
|
|
||
|
|
The documentation says that it can be set to interrupt whenever the
|
||
|
|
on-chip buffer needs CPU attention. I couldn't get this to work. So
|
||
|
|
the driver polls for data-ready in the pseudo-DMA transfer routine.
|
||
|
|
The interrupt support routines in the NCR3280.c core modules handle
|
||
|
|
scsi disconnect/reconnect, and this (mostly) works. However..... I
|
||
|
|
have tested it with 4 totally different hard drives (both SCSI-1 and
|
||
|
|
SCSI-2), and one CDROM drive. Interrupts works great for all but one
|
||
|
|
specific hard drive. For this one, the driver will eventually hang in
|
||
|
|
the transfer state. I have tested with: "dd bs=4k count=2k
|
||
|
|
of=/dev/null if=/dev/sdb". It reads ok for a while, then hangs.
|
||
|
|
After beating my head against this for a couple of weeks, getting
|
||
|
|
nowhere, I give up. So.....This driver does NOT use interrupts, even
|
||
|
|
if you have the card jumpered to an IRQ. Probably nobody will ever
|
||
|
|
care.
|