Intel PCH-LP, Programming Manual

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Flash Image Tool
7.2.1.1 Region Access Control
In the Flash Image Tool these access values can be set by selecting the “Descriptor
Region” tree node and selecting “CPU/BIOS” under “Master Access Section”.
The read and write access hexadecimal values can be specified in the appropriate
parameters.
See
393H
Section 4.3 for more information.
The setting shown above is the minimum set of the read/write parameters for GbE LAN
master access recommended for production phase. It will lock down descriptor region
with a necessary level of security for Intel
®
ME enabled systems. There are
recommended settings (intended for debug/manufacturing or production phase)
provided by FITC for different Master Access. By locking the descriptor region late in
the manufacturing flow, the manufacturer has more flexibility in the programming of
the flash device. As stated above, once the region is locked, changes to the flash device
will be limited.
Figure 7-6. Region Access Control
Figure 7-7. Descriptor Region – Master Access Section Options