User guide

114 Enhanced OS-9 for X86 PCAT

Installing and Configuring Enhanced OS-9

Diamond FirePort20 and FirePort40—Wide, Ultra and

Ultra Wide

Highlights

• Wide support

• Ultra FAST20 support

• SCRIPTS RAM support ( able to run scripts from on chip RAM ) (1)

• Large FIFO enabled

• Increased burst rates to 128 where supported

• Special PCI cache features enabled (2)

• PCI IO Mode selectable (PCI I/O or PCI Memory ) (3)

Notes

1. The SCRIPTS RAM support is currently only available on OS-9, X86

based systems. Requires non translation of PCI memory. To use

SCRIPTS RAM support include the "-dSCRIPTS_RAM" in the

compile line when making the driver.

2. Instruction prefetch is not enabled by default. Maximum burst rate

and large fifo's are enabled.

3. By default the Microware Symbios driver will use the PCI I/O model.

To speed up transfers especially on X86 platforms the memory

module may be used. In the PCI memory mode no in/out

instructions are used. For the X86 platform this removes the CPU

related waits added by the use of "inc", "outc" etc... If the user

desires to run the driver in PCI Memory mode the driver may be

recompiled with the "-dPCI_IO_MAPPED" flag removed.

MWOS/OS9000/80386/PORTS/PCAT/SCSI/SCSI8XX/makefile

IO_MAPPED = -dPCI_IO_MAPPED

To use memory model change to:

IO_MAPPED = # -dPCI_IO_MAPPED