Intel 6 SERIES CHIPSET - DATASHEET 01-2011 - Page 815

Datasheet 815
Serial Peripheral Interface (SPI)
21.1.7 FRAP—Flash Regions Access Permissions Register
(SPI Memory Mapped Configuration Registers)
Memory Address: SPIBAR + 50h Attribute: RO, R/W
Default Value: 00000202h Size: 32 bits
Note: This register is only applicable when SPI device is in descriptor mode.
Bit Description
31:24
BIOS Master Write Access Grant (BMWAG) — R/W. Each bit [31:29] corresponds
to Master[7:0]. BIOS can grant one or more masters write access to the BIOS region 1
overriding the permissions in the Flash Descriptor.
Master[1] is Host processor/BIOS, Master[2] is Intel
®
Management Engine, Master[3]
is Host processor/GbE. Master[0] and Master[7:4] are reserved.
The contents of this register are locked by the FLOCKDN bit.
23:16
BIOS Master Read Access Grant (BMRAG) — R/W. Each bit [28:16] corresponds to
Master[7:0]. BIOS can grant one or more masters read access to the BIOS region 1
overriding the read permissions in the Flash Descriptor.
Master[1] is Host processor/BIOS, Master[2] is Intel
®
Management Engine, Master[3]
is Host processor/GbE. Master[0] and Master[7:4] are reserved.
The contents of this register are locked by the FLOCKDN bit
15:8
BIOS Region Write Access (BRWA) — RO. Each bit [15:8] corresponds to Regions
[7:0]. If the bit is set, this master can erase and write that particular region through
register accesses.
The contents of this register are that of the Flash Descriptor. Flash Master 1 Master
Region Write Access OR a particular master has granted BIOS write permissions in their
Master Write Access Grant register or the Flash Descriptor Security Override strap is
set.
7:0
BIOS Region Read Access (BRRA) — RO. Each bit [7:0] corresponds to Regions
[7:0]. If the bit is set, this master can read that particular region through register
accesses.
The contents of this register are that of the Flash Descriptor.Flash Master 1.Master
Region Write Access OR a particular master has granted BIOS read permissions in their
Master Read Access Grant register or the Flash Descriptor Security Override strap is
set.