HP Vectra XE320 hp vectra xe320, technical reference manual - Page 32

BIOS Overview BIOS Addresses This section provides a summary of the main features of the HP system BIOS. System Memory Map Reserved memory used by accessory boards must be located in the area from C8000h to EFFFFh. 0000 0000 - 0000 03FF 0000 0400 - 0000 04FF 0000 0500 - 0009 FC00 0009 FC00 - 0009 FFFF 000A_0000 - 000B_FFFF 000C 0000 - 000C 7FFF 000C 8000 - 000E 0000 000E 0000 - 000F FFFF 10 0000 - FF FFFF 100 0000 - 1FF FFFF 200 0000 -3FF FFFF 400 0000 -1FFF FFFF FFF80000 - FFFF FFFF Real-mode IDT BIOS Data Area Used by OS Extended BIOS Data Area Video RAM or SMRAM (not visible unless in SMM) Video ROM Adapter ROM, RAM, memory-mapped registers System BIOS (Flash/Shadow) Memory (1MB to 16MB) Memory (16MB to 32MB) Memory (32MB to 64MB) Memory (64MB to 1.5GB)1 512KB BIOS (Flash) 1.The last MB of memory in this area is used as Unified Memory Architecture (UMA) embedded memory. HP I/O Port Map (I/O Addresses Used by the System) Peripheral devices, accessory devices and system controllers are accessed via the system I/O space, which is not located in system memory space. The 64KB of addressable I/O space comprises 8-bit and 16bit registers (called I/O ports) located in the various system components. When installing an accessory board, ensure that the I/O address space selected is in the free area of the space reserved for accessory boards (100h to 3FFh). Although the Setup program can be used to change some of the settings, the following address map is not completely BIOS dependent, but is determined partly by the operating system. Note that some of the I/O addresses are allocated dynamically. 32 XE320 product description