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1 | README file for the Linux DTC3180/3280 scsi driver. |
2 | by Ray Van Tassle (rayvt@comm.mot.com) March 1996 |
3 | Based on the generic & core NCR5380 code by Drew Eckhard |
4 | |
5 | SCSI device driver for the DTC 3180/3280. |
6 | Data Technology Corp---a division of Qume. |
7 | |
8 | The 3280 has a standard floppy interface. |
9 | |
10 | The 3180 does not. Otherwise, they are identical. |
11 | |
12 | The DTC3x80 does not support DMA but it does have Pseudo-DMA which is |
13 | supported by the driver. |
14 | |
15 | It's DTC406 scsi chip is supposedly compatible with the NCR 53C400. |
16 | It is memory mapped, uses an IRQ, but no dma or io-port. There is |
17 | internal DMA, between SCSI bus and an on-chip 128-byte buffer. Double |
18 | buffering is done automagically by the chip. Data is transferred |
19 | between the on-chip buffer and CPU/RAM via memory moves. |
20 | |
21 | The driver detects the possible memory addresses (jumper selectable): |
22 | CC00, DC00, C800, and D800 |
23 | The possible IRQ's (jumper selectable) are: |
24 | IRQ 10, 11, 12, 15 |
25 | Parity is supported by the chip, but not by this driver. |
26 | Information can be obtained from /proc/scsi/dtc3c80/N. |
27 | |
28 | Note on interrupts: |
29 | |
30 | The documentation says that it can be set to interrupt whenever the |
31 | on-chip buffer needs CPU attention. I couldn't get this to work. So |
32 | the driver polls for data-ready in the pseudo-DMA transfer routine. |
33 | The interrupt support routines in the NCR3280.c core modules handle |
34 | scsi disconnect/reconnect, and this (mostly) works. However..... I |
35 | have tested it with 4 totally different hard drives (both SCSI-1 and |
36 | SCSI-2), and one CDROM drive. Interrupts works great for all but one |
37 | specific hard drive. For this one, the driver will eventually hang in |
38 | the transfer state. I have tested with: "dd bs=4k count=2k |
39 | of=/dev/null if=/dev/sdb". It reads ok for a while, then hangs. |
40 | After beating my head against this for a couple of weeks, getting |
41 | nowhere, I give up. So.....This driver does NOT use interrupts, even |
42 | if you have the card jumpered to an IRQ. Probably nobody will ever |
43 | care. |
44 |
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