> > Hello Rostyslav, I would like to remind the previous email. > I still do not know which bit in D18F4x044 represents the > EnableCF8ExtCfg config. > Hi Pali, Sorry for the late reply again. So in D18F4x044: - bit 0. EnableCf8ExtCfg. Enable PCI extended configuration register access for CFC/CF8 accesses; - bit 1. DisPciCfgReg. Disable CFC/CF8 Accesses to IO space. When set to 1, CFC/CF8 accesses are treated as PCI IO space accesses and not PCI configuration accesses. Unfortunately, I don't know if this also applies to later families.