LPC Interface Bridge Registers (D31:F0)
Bit
Description
FWH_C0_EN — R/W. This bit enables decoding two 512-KB Firmware Hub memory
ranges.
0 = Disable.
8
1 = Enable the following ranges for the Firmware Hub
FFC00000h – FFC7FFFFh
FF800000h – FF87FFFFh
FWH_Legacy_F_EN — R/W. This enables the decoding of the legacy 64KB range at
F0000h – FFFFFh.
0 = Disable.
1 = Enable the following legacy ranges for the Firmware Hub
F0000h – FFFFFh
7
NOTE: The decode for the BIOS legacy F segment is enabled only by this bit and is not
affected by the GEN_PMCON_1.iA64_EN bit.
FWH_Legacy_E_EN — R/W. This enables the decoding of the legacy 64KB range at
E0000h – EFFFFh.
0 = Disable.
1 = Enable the following legacy ranges for the Firmware Hub
E0000h – EFFFFh
6
NOTE: The decode for the BIOS legacy E segment is enabled only by this bit and is not
affected by the GEN_PMCON_1.iA64_EN bit.
5:4
3
Reserved
FWH_70_EN — R/W. Enables decoding two 1-M Firmware Hub memory ranges.
0 = Disable.
1 = Enable the following ranges for the Firmware Hub
FF70 0000h – FF7F FFFFh
FF30 0000h – FF3F FFFFh
FWH_60_EN — R/W. Enables decoding two 1-M Firmware Hub memory ranges.
0 = Disable.
2
1
0
1 = Enable the following ranges for the Firmware Hub
FF60 0000h – FF6F FFFFh
FF20 0000h – FF2F FFFFh
FWH_50_EN — R/W. Enables decoding two 1-M Firmware Hub memory ranges.
0 = Disable.
1 = Enable the following ranges for the Firmware Hub
FF50 0000h – FF5F FFFFh
FF10 0000h – FF1F FFFFh
FWH_40_EN — R/W. Enables decoding two 1-M Firmware Hub memory ranges.
0 = Disable.
1 = Enable the following ranges for the Firmware Hub
FF40 0000h – FF4F FFFFh
FF00 0000h – FF0F FFFFh
NOTE: This register effects the BIOS decode regardless of whether the BIOS is resident on LPC or
SPI. The concept of Feature Space does not apply to SPI-based flash. The ICH simply
decodes these ranges as memory accesses when enabled for the SPI flash interface.
Datasheet
407
INTEL [ INTEL ]
