Installation guide

3.7 AXPvme Single Board Computers

For information on how to conﬁgure AXPvme single board computers, see

the Writing VMEbus Device Drivers manual.

The following notes are speciﬁc to the AXPvme SBCs.

3.7.1 Firmware Upgrade Required

Compaq AXPvme SBCs must upgrade to Version 17.0 or higher of the

AXPvme ﬁrmware to run Tru64 UNIX Version 4.0F.

3.7.2 Unpredictable Results When Performing Master Block

Transfers

The following restriction applies to the VIP/VIC adapter used on Compaq

AXPvme SBCs and Compaq Alpha VME 2100 systems.

Performing master block transfers with a data width of D64 can produce

unpredictable results in the following cases:

• If D64 slave access is performed before memory has been mapped to the

VMEbus.

• If memory access does not coincide with the appropriate access mode,

such as attempting user access to memory speciﬁed as supervisory mode

access.

• If the AXPvme SBC or Alpha VME 2100 system is a VME interrupter

and is targeted for D64 slave access. The interrupt vector presented by

the VME interrupter may not be the vector speciﬁed in the

vba_post_irq function.

Memory must be mapped to the VMEbus prior to D64 slave access.

Access to memory must coincide with the appropriate access mode. If

supervisory mode access is speciﬁed when memory is mapped, memory

accesses must use supervisory mode. If user mode access is speciﬁed, both

supervisory and user access are allowed.

See the Writing VMEbus Device Drivers manual for more information on

slave and master block transfers.

3.8 DEC 7000 System

The following note is speciﬁc to the DEC 7000 system.

3–14 Processor-Speciﬁc Notes