NVM Information Guide—ICH8/ICH9
24
1.4.25.4
IBA Capabilities (Word 33h)
Word 33h is used to enumerate the boot technologies that have been programmed into
the Flash. It is updated by IBA configuration tools and is not updated or read by IBA.
Table 20.
IBA Capabilities
1.4.26
Checksum (Word 3Fh)
The Checksum word (NVM bytes 7Eh and 7Fh) is used to ensure that the base NVM
image is valid. Its value should be calculated by adding all words (00h through 3Fh)/
bytes (00h-7Eh), including the Checksum word itself. The sum, including the
Checksum, should equal BABAh. The initial value before the values are added together
should be 0000h, and the carry bit should be ignored after each addition. If the OEM
does not desire to calculate the checksum, LAD programming tools and drivers will
detect if the checksum is incorrect and fix it in the image.
Note:
The default image always has a checksum value of 0. The default image always has a
checksum value of 0b. The LAD programming tools (EEUPDATE or LANCONF) update
the checksum when the image is programmed.
Bit
Name
Description
15:14
SIG
Signature. These bits must be set to 01b to indicate that this word has
been programmed by the agent or other configuration software.
13:5
Reserved
Reserved for future use. All bits must be set to 0b.
4
SAN
SAN capability is present in Flash.
0b = The SAN capability is not present (default).
1b = The SAN capability is present.
3
EFI
EFI UNDI capability is present in Flash.
0b = The RPL code is not present (default).
1b = The RPL code is present.
2
RPL
RPL capability is present in Flash.
1b = The RPL code is present (default).
0b = The RPL code is not present.
1
UNDI
PXE/UNDI capability is present in Flash.
1b = The PXE base code is present (default).
0b = The PXE base code is not present.
0
BC
PXE base code is present in Flash.
0b = The PXE base code is present (default).
1b = The PXE base code is not present.
