Техническая Спецификация для Intel E3815 FH8065301567411
Модели
FH8065301567411
PCU – System Management Bus (SMBus)
Intel
®
Atom™ Processor E3800 Product Family
4438
Datasheet
33.3
Use
33.3.1
Function Disable
The SMBus interface may be disable by setting FUNC_DIS_2.SMB_DIS to 1b.
33.3.2
SPD Write Disable
DRAM memory modules contain a 256-byte EEPROM, called SPD, accessible via SMBus
used to store configuration information such as timing, physical size and more. A
malicious user with administrative privileges can change and permanently lock invalid
settings which could then lead to a permanent denial of service attack or a memory
aliasing attack.
used to store configuration information such as timing, physical size and more. A
malicious user with administrative privileges can change and permanently lock invalid
settings which could then lead to a permanent denial of service attack or a memory
aliasing attack.
Write access to the SPI should be disabled by setting SMB_Config_HCFG.SPD_WD to
1b.
1b.
33.4
References
•
System Management Bus (SMBus) Specification Version 2.0:
www.smbus.org/specs/
33.5
Register Map
for additional information.
27:20 Data Byte Low – 8 bits
External Master
Loaded into the Notify Data Low Byte
Register (SMB_Mem_NDLB)
Register (SMB_Mem_NDLB)
28
ACK
SoC
36:29 Data Byte High – 8 bits
External Master
Loaded into the Notify Data High Byte
Register (SMB_Mem_NDHB)
Register (SMB_Mem_NDHB)
37
ACK
SoC
38
Stop
External Master
Table 313. Host Notify Format (Sheet 2 of 2)
Bit
Description
Driven By
Comment