System Address Map Initialization in x86/x64 Architecture Part 1 - Article

New article explaining details of PCI-based system address map initialization is up: http://resources.infosecinstitute.com/system-address-map-initialization-in-x86x64-architecture-part-1-pci-based-systems/. This is part one of two articles. I started with PCI because the basic knowledge on the bus protocol is essential before moving to part two which covers present day PCIe systems.