82571EB/82572EI EEPROM Information Guide
12
1.7.9
EEPROM Sizing and Protected Fields (Word 12h)
Note:
The software device driver has read but no write access to this word via the EEC and EERD
registers. Write access is possible only through an authenticated firmware interface.
1.7.10
Management Capabilities (Word 13h, Lower Byte)
This word contains the 82571EB/82572EI’s manageability capabilities and is only used by device
software. It should not enable any capability (in the upper byte) that is not enabled in this byte. The
OEM is responsible for initializing this byte.
1.7.11
Management Enable Byte (Word 13h, Upper Byte)
This byte contains information for firmware regarding enabled manageability functions. After this
byte is updated, the software device driver should notify firmware of the change. If the
manageability subsystem is in a mode where its host interface is active, then it should be done by
the manageability host command. If the host interface is inactive, the software device driver should
wake the manageability subsystem by asserting the
Wake Management Clock (WMNG)
bit in the
Software Semaphore (SWSM) register.
Table 7. EEPROM Sizing and Protected Fields (Word 12h)
Bit
Name
Description
15:14
Signature
The Signature field indicates to the device that there is a valid EEPROM
present. If the Signature field is not 01b, the other bits in this word are
ignored, no further EEPROM read is performed and default values are used
for the configuration space IDs.
13:10
EEPROM
Size
These bits indicate the EEPROM actual size:
0000b = 128 bytes
0001b = 256 bytes
0010b = 512 bytes
0011b = 1 KB
0100b = 2 KB
0101b = 4 KB
0110b = 8 KB
0111b = 16 KB
1000b = 32 KB
1001b = 64 KB
1010b - 1011b = Reserved
9:4
Reserved
Reserved. Set to 00h.
3:0
Reserved
Reserved. Set to 00h.
