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Intel C2518 FH8065501516710 Data Sheet

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FH8065501516710
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Intel
®
 Atom™ Processor C2000 Product Family for Microserver
September 2014
Datasheet, Vol. 2 of 3
Order Number: 330061-002US
373
Volume 2—Platform Controller Unit (PCU)—C2000 Product Family
BIOS Ranges on Flash Memory Devices
16.6
BIOS Ranges on Flash Memory Devices
16.6.1
BIOS Decode Enable for LPC and SPI
This register affects the BIOS decode regardless of whether the BIOS is resident on the 
Low Pin Count (LPC) bus interface or the Serial Peripheral Interface (SPI).
The PCU uses the enabled memory-address ranges to decode memory requests from 
rest of the system. Provided that other system and security conditions are met, these 
memory requests are passed to the devices on the LPC bus interface or SPI devices. 
Whether passed to the LPC or SPI depends on which has been configured as the source 
of the BIOS Flash memory. See 
 
for details.
See 
 for the list of enable bits and associated memory-address ranges. 
Multiple ranges are enabled by the software. The concept of feature space does not 
apply to the SPI-based Flash.
Table 16-7. Enable Bits in the BIOS Decode Enable (BDE) Register
Data 
Memory 
Address 
Start
Data 
Memory 
Address 
End
Size of 
Segment
Device 
on LPC 
Interface
Bit 
Name
Enable Bit in 
the
BIOS Decode 
Enable 
Register
Feature 
Memory 
Address 
Start
(LPC only)
Feature 
Memory 
Address 
End
(LPC only)
FFF8_0000
FFFF_FFFF
512 KB
BDE.EF8
EF8
F8-FF Enable
FFB8_0000
FFBF_FFFF
FFF0_0000
FFF7_FFFF
512 KB
BDE.EF0
EF0
F0-F7 Enable
FFB0_0000
FFB7_FFFF
FFE8_0000
FFEF_FFFF
512 KB
BDE.EE8
EE8
E8-EF Enable
FFA8_0000
FFAF_FFFF
FFE0_0000
FFE7_FFFF
512 KB
BDE.EE0
EE0
E0-E7 Enable
FFA0_0000
FFA7_FFFF
FFD8_0000
FFDF_FFFF
512 KB
BDE.ED8
ED8
D8-DF Enable
FF98_0000
FF9F_FFFF
FFD0_0000
FFD7_FFFF
512 KB
BDE.ED0
ED0
D0-D7 Enable
FF90_0000
FF97_FFFF
FFC8_0000
FFCF_FFFF
512 KB
BDE.EC8
EC8
C8-CF Enable
FF88_0000
FF8F_FFFF
FFC0_0000
FFC7_FFFF
512 KB
BDE.EC0
EC0
C0-C7 Enable
FF80_0000
FF87_FFFF
FF70_0000
FF7F_FFFF
1 MB
E70
70-7F Enable
FF30_0000
FF3F_FFFF
FF60_0000
FF6F_FFFF
1 MB
E60
60-6F Enable
FF20_0000
FF2F_FFFF
FF50_0000
FF5F_FFFF
1 MB
E50
50-5F Enable
FF10_0000
FF1F_FFFF
FF40_0000
FF4F_FFFF
1 MB
E40
40-4F Enable
FF00_0000
FF0F_FFFF
Legacy Segments in the Lowest MB of Memory Space
000F_0000
000F_FFFF
64 KB
LFE
Legacy F 
Segment Enable
000E_0000
000E_FFFF
64 KB
LEE
Legacy E 
Segment Enable