C-24 Sun Blade 150 Service Manual • June 2002
C.10.2.2 PCI Bus B Address Assignments
The PCI bus B address assignments are as follows:
■ PCIO ASIC registers
■ OpenBoot PROM
PCIO ASIC Registers
The PCIO ASIC is a PCI client. The address can be reprogrammed by software
during boot only. Therefore, instead of providing absolute addresses for each of the
registers, only offset addresses that are relative to a base address are given.
The PCIO ASIC is a multifunction PCI device and its configuration space has three
base address pointers:
■ Openboot PROM
■ EBus2 (function 0)
■ Ethernet (function 1)
Boot PROM
The PCIO ASIC is strapped so that the red mode trap address is:
■ UPA: 0x1FF.F000.0000
■ PCI: 0xF000.0000
■ EBus2: 0x00.0000
The following table lists the Openboot and flash PROM address assignments.
TABLE C-9 Openboot PROM/Flash PROM Address Assignments
Offset Register Description Type Size
0x00.0000 - 0xFF.FFFF Flash PROM/EPROM R 1 or 4 bytes
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