User`s guide

8 System Resources

8.1 System Memory Map

Table 29 Memory Map

Address Range (decimal) Address Range (hex) Size Description

(TOM-xxxx) – TOM N.A. N.A. ACPI reclaim, PCI memory range, Video, ….

1024kB – (TOM-xxxx) 100000 – N.A N.A. Extended memory

869kB – 1024kB E0000 - FFFFF 128kB Runtime BIOS

768kB – 896kB C0000 - DFFFF Expansion Area

640kB – 768kB A0000 - BFFFF 128kB Video memory and BIOS

639kB – 640kB 9FC00 - 9FFFF 1kB Extended BIOS data

0 – 639kB 00000 - 9FC00 512kB Conventional memory

Note

T.O.M. = Top of memory = max. DRAM installed

8.2 I/O Address Assignment

The I/O address assignment of the conga-TCA module is functionally identical with a standard PC/AT. The BIOS assigns PCI and PCI Express

I/O resources from FFF0h downwards. Non PnP/PCI/PCI Express compliant devices must not consume I/O resources in that area.

8.2.1 LPC Bus

On the conga-TCA, the internal PCI Bus acts as the subtractive decoding agent. All I/O cycles that are not positively decoded are forwarded to

the internal PCI Bus not the LPC Bus. Only specied I/O ranges are forwarded to the LPC Bus. In the congatec Embedded BIOS the following

I/O address ranges are sent to the LPC Bus:

2Eh – 2Fh

4Eh – 4Fh

60h, 61h-64h

2E8h – 2EFh

2F8h – 2FFh

378h – 37Fh