SC(4) | Device Drivers Manual | SC(4) |
sc
—
sc0 at mbmem0 addr 0x80000 ipl 2
sc1 at mbmem0 addr 0x84000 ipl 2
sc0 at vme0 addr 0x200000 irq 2 vec 0x40
sc
driver provides support for the Sun Microsystems
“Sun-2” SCSI Bus Controller chipset found on various VME boards
(Sun part #s 501-1045, 501-1138, 501-1149, and 501-1167) and on the
“Sun-2 SCSI/Serial” (Sun part # 501-1006) Multibus board.
All versions of this driver can be configured with a flags directive in the config(1) file. The values are bits in a bitfield, and are interpreted as follows:
For example: “flags 0x1ff” would disable DMA interrupts, and disable parity checking for targets 0-7. The “target” is the SCSI ID number of a particular device on a particular SCSI bus.
This chipset has no support for raising the ATN signal, so there is no way to ever schedule a MSG_OUT phase on the bus. Currently, the driver will ultimately reset the bus if this phase is ever requested by the upper layer SCSI driver.
This chipset has no support for SCSI disconnect/reselect. This means that slow devices, such as tape drives, can hog, or “lock up” the SCSI bus.
This driver has not been tested in combination with non-SCSI devices behind Emulex or Adaptec bridges, which are common in Sun 2s and in Sun Shoebox-type configurations. These devices pre-date the SCSI-I spec, and might not behave the way the chipset code currently expects.
June 28, 2001 | NetBSD 9.4 |