82NM10 Datasheet, PDF (264/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

Register and Memory Mapping
Note:
Note:
Note:
If a power failure occurs at any point after step 3, the system will be able to boot from
the copy of the boot block that is stored in the block below the top. This is because the
TOP_SWAP bit is backed in the RTC well.
The top-block swap mode may be forced by an external strapping option (See Section
2.22.1 - Volume 1). When top-block swap mode is forced in this manner, the
TOP_SWAP bit cannot be cleared by software. A re-boot with the strap removed will be
required to exit a forced top-block swap mode.
Top-block swap mode only affects accesses to the Firmware Hub space, not feature
space.
The top-block swap mode has no effect on accesses below FFFE_0000h.
§
264
Datasheet