HP Deskpro EX Technical Reference Manual page 96

Chapter 5 Input/Output Interfaces
Hard drive types not found in the ROM's parameter table are automatically configured as to
(soft)type by DOS as follows:
Primary controller: drive 0, type 65; drive 1, type 66
Secondary controller: drive 0, type 68; drive 1, type 15
Non-DOS (non-Windows) operating systems may require using Setup (F10) for drive
configuration.
5.2.1.1 IDE Configuration Registers
The IDE controller is configured as a PCI device with bus mastering capability. The PCI
configuration registers for the IDE controller function (PCI device #31, function #1) are listed in
Table 5-1.
Table 5–1. IDE PCI Configuration Registers
EIDE PCI Configuration Registers (82801, Device 31/Function 1)
PCI Conf.
Addr. Register
00-01h Vender ID
02-03h Device ID
04-05h PCI Command
06-07h PCI Status
08h Revision ID
09h Programming
0Ah Sub-Class
0Bh Base Class Code
0Dh Master Latency Timer
0Eh Header Type
NOTE:
Assume unmarked gaps are reserved and/or not used.
5.2.1.2 IDE Bus Master Control Registers
The IDE interface can perform PCI bus master operations using the registers listed in Table 5-2.
These registers occupy 16 bytes of variable I/O space set by software and indicated by PCI
configuration register 20h in the previous table.
Table 5–2. IDE Bus Master Control Registers
I/O Addr. Size
Offset (Bytes)
00h 1
02h 1
04h 4
08h 1
0Ah 2
0Ch 4
NOTE:
Unspecified gaps are reserved, will return indeterminate data, and should not be written to.
5-2 Compaq Deskpro EX Series of Personal Computers
Table 5-1.
Table 5-2.
IDE Bus Master Control Registers
Register
Bus Master IDE Command (Primary)
Bus Master IDE Status (Primary)
Bus Master IDE Descriptor Pointer (Pri.)
Bus Master IDE Command (Secondary)
Bus Master IDE Status (Secondary)
Bus Master IDE Descriptor Pointer (Sec.)
First Edition – August 2000
Reset PCI Conf.
Value Addr. Register
8086h 0F..1Fh Reserved
2411h 20-23h BMIDE Base Address
0000h 2C, 2Dh Subsystem Vender ID
0280h 2E, 2Fh Subsystem ID
00h 30..3Fh Reserved
80h 40-43h Pri./Sec. IDE Timing
01h 44h Slave IDE Timing
01h 48h Sync. DMA Control
00h 4A-4Bh Sync. DMA Timing
00h 54h EIDE I/O Config.Register
Default
Value
00h
00h
0000 0000h
00h
00h
0000 0000h
Reset
Value
0's
1
0000h
0000h
0's
0's
00h
00h
0000h
00h