Datasheet

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LPC Interface Bridge Registers (D31:F0)

254 Intel® Xeon® Processor D-1500 Product Family

Datasheet - Volume 1 of 4: Integrated Platform Controller Hub

March 2015

7.1.31 BIOS_SEL2—BIOS Select 2 Register (LPC I/F—D31:F0)

Offset Address: D4h–D5h Attribute: R/W

Default Value: 4567h Size: 16 bits

7.1.32 BIOS_DEC_EN1—BIOS Decode Enable Register (LPC I/F—

D31:F0)

Offset Address: D8h–D9h Attribute: R/W, RO

Default Value: FFCFh Size: 16 bits

15:12 BIOS_D8_IDSEL — R/W. IDSEL for two 512-KB BIOS memory ranges. The IDSEL programmed in

this field addresses the following memory ranges:

FFD8 0000h–FFDF FFFFh

FF98 0000h–FF9F FFFFh

11:8 BIOS_D0_IDSEL — R/W. IDSEL for two 512-KB BIOS memory ranges. The IDSEL programmed in

this field addresses the following memory ranges:

FFD0 0000h–FFD7 FFFFh

FF90 0000h–FF97 FFFFh

7:4 BIOS_C8_IDSEL — R/W. IDSEL for two 512-KB BIOS memory ranges. The IDSEL programmed in

this field addresses the following memory ranges:

FFC8 0000h–FFCF FFFFh

FF88 0000h–FF8F FFFFh

3:0 BIOS_C0_IDSEL — R/W. IDSEL for two 512-KB BIOS memory ranges. The IDSEL programmed in

this field addresses the following memory ranges:

FFC0 0000h–FFC7 FFFFh

FF80 0000h–FF87 FFFFh

Bit Description

15:12 BIOS_70_IDSEL — R/W. IDSEL for two, 1-M BIOS memory ranges. The IDSEL programmed in this

field addresses the following memory ranges:

FF70 0000h–FF7F FFFFh

FF30 0000h–FF3F FFFFh

11:8 BIOS_60_IDSEL — R/W. IDSEL for two, 1-M BIOS memory ranges. The IDSEL programmed in this

field addresses the following memory ranges:

FF60 0000h–FF6F FFFFh

FF20 0000h–FF2F FFFFh

7:4 BIOS_50_IDSEL — R/W. IDSEL for two, 1-M BIOS memory ranges. The IDSEL programmed in this

field addresses the following memory ranges:

FF50 0000h–FF5F FFFFh

FF10 0000h–FF1F FFFFh

3:0 BIOS_40_IDSEL — R/W. IDSEL for two, 1-M BIOS memory ranges. The IDSEL programmed in this

field addresses the following memory ranges:

FF40 0000h–FF4F FFFFh

FF00 0000h–FF0F FFFFh

Bit Description

15 BIOS_F8_EN — RO. This bit enables decoding two 512-KB BIOS memory ranges, and one 128-KB

memory range.

0 = Disable

1 = Enable the following ranges for the BIOS

FFF80000h–FFFFFFFFh

FFB80000h–FFBFFFFFh

14 BIOS_F0_EN — R/W. This bit enables decoding two 512-KB BIOS memory ranges.

0 = Disable.

1 = Enable the following ranges for the BIOS:

FFF00000h–FFF7FFFFh

FFB00000h–FFB7FFFFh