Advanced Configuration and Power Interface Specification

Device Configuration
6.4.2.9 End Tag
Type 0, Small Item Name 0xF, Length = 1
The End tag identifies an end of resource data.
Note: If the checksum field is zero, the resource data is treated as if the checksum operation
succeeded. Configuration proceeds normally.
Table 6-201 End Tag Definition
Offset Field Name
Byte 0 Value = 0x79 (01111001B) – Type = 0, Small item name = 0xF, Length = 1
Byte 1 Checksum covering all resource data after the serial identifier. This checksum is generated
such that adding it to the sum of all the data bytes will produce a zero sum.
The End Tag is automatically generated by the ASL compiler at the end of the ResourceTemplate
statement.
6.4.3 Large Resource Data Type
To allow for larger amounts of data to be included in the configuration data structure the large
format is shown below. This includes a 16-bit length field allowing up to 64 KB of data.
Table 6-202 Large Resource Data Type Tag Bit Definitions
Offset
Byte 0
Byte 1
Byte 2
Bytes 3 to
(Length + 2)
Field Name
Value = 1xxxxxxxB – Type = 1 (Large item), Large item name = xxxxxxxB
Length of data items bits[7:0]
Length of data items bits[15:8]
Actual data items
The following large information items are currently defined:
Table 6-203 Large Resource Items
Large Item Name
Reserved
24-bit Memory Range Descriptor
Generic Register Descriptor
Reserved
Vendor Defined Descriptor
32-bit Memory Range Descriptor
32-bit Fixed Location Memory Range Descriptor
DWORD Address Space Descriptor
WORD Address Space Descriptor
Value
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
Version 6.0 349