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Chapter 8 BIOS ROM
Compaq iPAQ Series of Desktop Personal Computers
Review Copy - January 2001
8-12
8.5 PNP
SUPPORT
The BIOS includes Plug ’n Play (PnP) support for PnP version 1.0A.
NOTE
: For full PnP functionality to be realized, all peripherals used in the system must
be designed as “PnP ready.” Any installed ISA peripherals that are not “PnP ready” can
still be used in the system, although configuration parameters may need to be considered
(and require intervention) by the user.
Table 8-2 shows the PnP functions supported (for detailed PnP information refer to the Compaq
BIOS Technical Reference Guide):
Table 8-3. PnP BIOS Functions
Table 8-2.
PnP BIOS Functions
Function
Register
00h
Get number of system device nodes
01h
Get system device node
02h
Set system device node
03h
Get event
04h
Send message
40h
Get ISA configuration [1]
50h
Get SMBIOS Structure Information
51h
Get Specific SMBIOS Structure
NOTE:
[1] Since no ISA slots are present, this function will return 0 for the max. CSN.
The BIOS call INT 15, AX=E841h, BH=01h can be used by an application to retrieve the default
settings of PnP devices for the user. The application should use the following steps for the display
function:
1.
Call PnP function 01(get System Device Node) for each devnode with bit 1 of the control flag
set (get static configuration) and save the results.
2.
Call INT 15, AX=E841h, BH=01h.
3.
Call PnP “Get Static Configuration” for each devnode and display the defaults.
4.
If the user chooses to save the configuration, no further action is required. The system board
devices will be configured at the next boot. If the user wants to abandon the changes, then the
application must call PnP function 02 (Set System Device Node) for each devnode (with bit 1
of the control flag set for static configuration) with the results from the calls made prior to
invoking this function.
Содержание iPAQ 1.0
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