AHB(4)

NAME
ahb - Adaptec EISA SCSI host adapter driver

SYNOPSIS
controller ahb0 at isa? bio irq ? vector ahbintr
controller scbus0

For each disk:
device sd0

For each tape device:
device st0

For one or more cdroms:
device cd0

DESCRIPTION
This driver provides access to SCSI devices connected to an Adaptec 174x hostadapter in either Standard or Enhanced Mode. If the controller is set to Standard mode (by the ECU), the driver will automatically switch the card to Enhanced mode during the device probe.

Please note that the above implies that when you are configuring a system with both aha and ahb drivers, the ahb driver should be listed first in the kernel config file. This ensures that the ahb driver will find the Adaptec 174x boards before the aha driver probes for Adaptec 154x boards.

Note that no I/O addresses are configured in the kernel config file. The 174x uses EISA slot specific I/O which is configured automatically.

FILES
/sys/i386/isa/ahb.c
    driver source
/sys/i386/conf/GENERIC
    sample generic kernel config file for Adaptec based systems

SEE ALSO
aha(4) ahc(4) cd(4) scsi(4) sd(4) st(4)