cExpress-BT2
System Resources
37
6. System Resources
6.1.
System Memory Map
Address Range (decimal)
Address Range (hex)
Size
Description
Start 128KB below 1MB
000E0000h-000FFFFFh
Low BIOS
Starts 20MB below 4GB
FEC00000h-FEC0040h
IO APIC
Start 19MB below 4GB
FED00000h-FED003FFh
HPET
Start 64 KB below 4GB
FFFF0000h-FFFFFFFFh
High BIOS
0K –1MB
1MB
DOS DRAM
6.2.
I/O Map
Hex Range
Device
20h-21h, 24h-25h, 28h-29h, 2Ch-
2Dh, 30h-31h, 34h-5h, 38h-39h,
3Ch-3Dh
8259 Master
40h-43h, 50h-53h
8254s
60h, 64h
PS2 Control
61h, 63h, 65h, 67h
NMI Controller
70h-77h
RTC
80h-83h
Port 80h
92h
Init Register
A0h-A1h, A4h-A5h, A8h-A9h,
ACh-ADh, B0h-B1h,B4h-B5h,
B8h-B9h, BCh-BDh, 4D0h-4D1h
8259 Slave
2E8h-2FFh
COM2
3F8h-3FFh
COM1
B2h-B3h
Active Power Management
E000
SMBus base address for SB.
500
GPIO Base Address for SB
400
PM (ACPI) Base Address for SB
Содержание COM Express cExpress-BT2
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