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4 Summary of the HP/Phoenix BIOS
HP/Phoenix BIOS (BIOS version: GX.07.xx)
System Board Components (BIOS version: GX.07.xx)
This section provides more details of how the BIOS uses the system board
components mentioned in the I/O port list.
DMA Channel Controllers (BIOS version: GX.07.xx)
Only “I/O-to-memory” and “memory-to-I/O” transfers are allowed.
“I/O-to-I/O” and “memory-to-memory” transfers are disallowed by the
hardware configuration.
The system controller supports seven DMA channels, each with a page
register used to extend the addressing range of the channel to 16 MB.
1.
These addresses are dedicated to configuration registers for PCI devices.
0378-037F Parallel port 2
03B0-03BB Integrated video graphics controller
03BC--03BF Parallel port 1
03C0-03DF Integrated video graphics controller
03E8-03EF Serial port 3
03F0-03F5 Floppy disk controller
03F6 IDE controller primary channel
03F7 Floppy disk controller
03F8-03FF Serial port 1
0496-0497 Internal ports (or HP reserved)
0CF8-0CFF Used for PCI configuration
1
I/O Address Ports Function Bits