Intel B940 Datasheet Page 54
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Processor Configuration Registers
54 Datasheet, Volume 2
2.7.14 DEVEN—Device Enable Register
This register allows for enabling/disabling of PCI devices and functions that are within
the processor. The table below describes the behavior of all combinations of
transactions to devices controlled by this register. All the bits in this register are Intel
TXT Lockable.
3:2 RO 00b Reserved
1RW-L 0b
IGD VGA Disable (IVD):
0 = Enable. Device 2 (IGD) claims VGA memory and IO cycles, the Sub-
Class Code within Device 2 Class Code register is 00.
1 = Disable. Device 2 (IGD) does not claim VGA cycles (Memory and IO),
and the Sub- Class Code field within Device 2 function 0 Class Code
register is 80.
BIOS Requirement: BIOS must not set this bit to 0 if the GMS field (bits
6:4 of this register) pre-allocates no memory. This bit MUST be set to 1 if
Device 2 is disabled either using a fuse or fuse override (CAPID0[46] = 1) or
using a register (DEVEN[3] = 0).
This register is locked and becomes Read Only when CMD.LOCK.MEMCONFIG
is received or when ME_SM_LOCK is set to 1.
0RO 0bReserved
B/D/F/Type: 0/0/0/PCI
Address Offset: 52–53h
Reset Value: 0030h
Access: RW-L, RO
Bit Attr
Reset
Value
Description
B/D/F/Type: 0/0/0/PCI
Address Offset: 54–57h
Reset Value: 0000_210Bh
Access: RW-L, RO
BIOS Optimal Reset Value 000000h
Bit Attr
Reset
Value
Description
31:4 RO 0h Reserved
1RW-L 1b
PCI Express Port (D6EN)
0 = Bus 0, Device 1, Function 0 is disabled and hidden.
1 = Bus 0, Device 1, Function 0 is enabled and visible.
12:4 RO 00h Reserved
3RW-L 1b
Internal Graphics Engine Function 0 (D2F0EN)
0 = Bus 0, Device 2, Function 0 is disabled and hidden
1 = Bus 0, Device 2, Function 0 is enabled and visible
If this processor does not have internal graphics capability, then Device 2,
Function 0 is disabled and hidden independent of the state of this bit.
2RO 0hReserved
1RW-L 1b
PCI Express Port (D1EN)
0 = Bus 0, Device 1, Function 0 is disabled and hidden.
1 = Bus 0, Device 1, Function 0 is enabled and visible.
0RO 1b
Host Bridge (D0EN)
Bus 0: Device 0, Function 0 may not be disabled and is therefore hardwired
to 1.
- Datasheet – Volume 2 1
- Legal Lines and Disclaimers 2
- Contents 3
- 4 Datasheet, Volume 2 4
- Datasheet, Volume 2 5 5
- 6 Datasheet, Volume 2 6
- Datasheet, Volume 2 7 7
- 8 Datasheet, Volume 2 8
- Datasheet, Volume 2 9 9
- 10 Datasheet, Volume 2 10
- Datasheet, Volume 2 11 11
- Revision History 12
- 1 Introduction 13
- Introduction 14
- 2 Processor Configuration 15
- 2.2 System Address Map 17
- 18 Datasheet, Volume 2 18
- 2.2.1 Legacy Address Range 19
- Datasheet, Volume 2 21 21
- 2.2.2.2 TSEG 22
- 2.2.2.5 Pre-allocated Memory 23
- 2.2.2.7 Intel 24
- Management Engine (Intel 24
- ME) UMA 24
- Datasheet, Volume 2 25 25
- 2.2.2.10 High BIOS Area 26
- Datasheet, Volume 2 27 27
- 2.2.3.1 Programming Model 28
- HOST/SYSTEM VIEW 29
- PHYSICAL MEMORY 29
- (DRAM CONTROLLER VIEW) 29
- Datasheet, Volume 2 33 33
- 34 Datasheet, Volume 2 34
- 2.2.9 I/O Address Space 35
- 36 Datasheet, Volume 2 36
- Datasheet, Volume 2 37 37
- 2.4 Configuration Mechanisms 38
- Datasheet, Volume 2 39 39
- 40 Datasheet, Volume 2 40
- Datasheet, Volume 2 41 41
- 42 Datasheet, Volume 2 42
- Datasheet, Volume 2 43 43
- 2.6 I/O Mapped Registers 44
- 2.7.6 CC—Class Code Register 49
- TXT Lockable 54
- 1:0 to 11b 56
- 4) from 58
- B0h, bits 15:4) 58
- 2.8 MCHBAR Registers 66
- 00h RW 67
- Register Symbol Register Name 67
- 208–209h 73
- 20A–20Bh 74
- 24D–24Fh 74
- 250-251h 75
- 252–255h 76
- 256–257h 77
- 258–25Ah 77
- 269–26Eh 79
- 298–29Bh 82
- 29C–29Fh 84
- 2B4–2B7h 84
- 600–601h 86
- 602–603h 86
- 604–605h 86
- 64D–64Fh 88
- 650–651h 88
- 652–655h 89
- 656–657h 90
- 658–65Ah 90
- 660–663h 91
- 6B4–6B7h 93
- C20–C27h 94
- 1001–1002h 94
- 1004–1005h 95
- 101E–101Fh 100
- Register 107
- 10EC–10EDh 108
- 2C20–2C22h 109
- 2.9 EPBAR Registers 110
- 2.10 PCI Device 1 Registers 115
- PCI device 117
- Port Command Register 140
- 11:10 RW-O 11b 143
- OS's during run time 155
- 104–107h 156
- 108–10Bh 157
- 10C–10Dh 157
- 110–113h 158
- 23 RO 0b Reserved 158
- 114–117h 158
- 11A–11Bh 159
- 2.12 DMIBAR Registers 161
- Declaration Capability 169
- 2.13.6 CC—Class Code Register 177
- Range Address Register 179
- GMADR register 180
- 2.14 Device 2 I/O Registers 183
- 100–107h 211
- 108–10Fh 212
- 200–20Fh 214
- F00–F03h 215
- F04–F07h 216
- Dedication 217
- F08–F0Bh 218
- FFC–FFFh 219
- 2.16 DMI VC1 REMAP Registers 221
- 2.17.2 GFXPLL1—GFX PLL BIOS 254
- 2.18 GFXVTBAR Registers 255
- Address Register 281
- 2.19 PCI Device 6 Registers 288
- 2.19.45 RSTS—Root Status 327
- 2.21 Intel 332
- Specific Registers 332
- 110–117h 333
- 330–337h 333
- Lower Half Register 334
- Upper Half Register 334
- QuickPath Architecture 335
- System Address Decode 335
- Register Description 335
- QPI Link 0 Registers 340
- QPI Physical 0 Registers 341
- 3.4 PCI Standard Registers 342
- 3.4.4 CCR—Class Code Register 344
- Identification Register 345
- 3.4.7 PCICMD—Command Register 346
- 3.5.1 MAX_RTIDS 349
- 3.6.1 SAD_PAM0123 349
- 3.6.2 SAD_PAM456 351
- 3.6.3 SAD_HEN 352
- 3.6.4 SAD_SMRAM 353
- 3.6.5 SAD_PCIEXBAR 354
- 3.7 Intel 356
- QPI Link Registers 356
- 3.8 Intel 357
- QPI Physical Layer Registers 357
- 360 Datasheet, Volume 2 360
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