"Write Protect / Writes blocked / Not Range Specific / SMI# override: Same as Write Protect in previous ICHs for FWH"
"Applies to the entire flash chip (Global Flash Protection)"
"Provides SMM the ability to determine whether or not a request to unlock the BIOS flash for writing will be permitted"
So possibly a situation where the writes are being marshalled to go via the System Management Mode, where there is lack of correct code there to handle it. (Or the opposite).
[Or I could be barking up completely the wrong tree]
Page 5 of:
http:// opensecuritytra ining.info/ IntroBIOS_ files/Day2_ 03_Advanced% 20x86%20- %20BIOS% 20and%20SMM% 20Internals% 20-%20SPI% 20Flash% 20Protection% 20Mechanisms. pptx
Talks about "Flash Protection Mechanism";
"Write Protect / Writes blocked / Not Range Specific / SMI# override: Same as Write Protect in previous ICHs for FWH"
"Applies to the entire flash chip (Global Flash Protection)"
"Provides SMM the ability to determine whether or not a request to unlock the BIOS flash for writing will be permitted"
So possibly a situation where the writes are being marshalled to go via the System Management Mode, where there is lack of correct code there to handle it. (Or the opposite).
[Or I could be barking up completely the wrong tree]