ISA and PC/104 Bus Considerations
Introduction
When writingxPC Target drivers for ISA and PC/104 devices,
consider the memory access method. A PCI device can be either port
mapped or memory mapped. Most ISA and PC/104 boards are port mapped.
Those that are memory mapped typically need large register banks or
are interfaced via dual-port memory.
Note
ThexPC Target kernel does not support ISA and PC/104 PNP
boards. This means that you can write xPC Target device drivers
only for ISA and PC/104 boards for which you can set the base address
manually. To manually set the base address, insert jumpers or move
DIP switches on the board. |
Port mapped
The base port address on the board is set via jumpers or switches.
You might need to reset these addresses if there are conflicts.
Memory mapped
The I/O and memory on the board are set via jumpers or switches.
You might need to reset these addresses if there are conflicts.
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I/O Mapped
The base port address on the board is set via jumpers or switches.
Drivers cannot discover these addresses on their own; you must specify
these addresses to the driver.
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Memory Mapped
The I/O and memory on the board is set via jumpers or switches.
Drivers cannot discover these addresses on their own; you must specify
these addresses to the driver.
Reserved Space on the Target PC
The xPC Target kernel reserves space in the
region (C0000 to DC000) for memory-mapped I/O cards. You must set
up ISA and PC/104 cards to use addresses in this range.
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 | ISA and PC/104 Drivers | | Masking Drivers |  |
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