Flash Region Access Permissions (BIOS_FRACC) – Offset 50 - 1.2 - ID:615146 | Intel® 400 Series Chipset On-Package Platform Controller Hub

Intel® 400 Series Chipset On-Package Platform Controller Hub

Online Register Database

ID	Date	Version	Classification
615146	08/09/2019	1.2	Public

Flash Region Access Permissions (BIOS_FRACC) – Offset 50

Bit Range	Default	Access	Field Name and Description
31:24	00h	RW/L	BIOS Master Write Access Grant (BMWAG) BIOS Master Write Access Grant (BMWAG): Each bit [31:24] 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. The contents of this register are locked by the FLOCKDN bit.
23:16	00h	RW/L	BIOS Master Read Access Grant (BMRAG) BIOS Master Read Access Grant (BMRAG): Each bit [23:16] 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. The contents of this register are locked by the FLOCKDN bit
15:8	42h	RO/V	BIOS Region Write Access (BRWA) BIOS Region Write Access (BRWA): 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. BIOS always have the write access to its own Region 1 and Region 6 by default.
7:0	C2h	RO/V	BIOS Region Read Access (BRRA) BIOS Region Read Access (BRRA): 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. BIOS always have the read access to its own Region 1 and Region 6 by default.