diff --git a/src/pci.cpp b/src/pci.cpp
index 5b01dd34..1adad313 100644
--- a/src/pci.cpp
+++ b/src/pci.cpp
@@ -481,98 +481,6 @@ int PciHandle::openMcfgTable() {
     return handle;
 }
 
-#ifndef PCM_USE_PCI_MM_LINUX
-
-PciHandleM::PciHandleM(uint32 bus_, uint32 device_, uint32 function_) :
-    fd(-1),
-    bus(bus_),
-    device(device_),
-    function(function_),
-    base_addr(0)
-{
-    int handle = ::open("/dev/mem", O_RDWR);
-    if (handle < 0) throw std::exception();
-    fd = handle;
-
-    int mcfg_handle = PciHandle::openMcfgTable();
-    if (mcfg_handle < 0) throw std::runtime_error("Cannot open any of /[pcm]/sys/firmware/acpi/tables/MCFG* files!");
-
-    int32 result = ::pread(mcfg_handle, (void *)&base_addr, sizeof(uint64), 44);
-
-    if (result != sizeof(uint64))
-    {
-        ::close(mcfg_handle);
-        throw std::exception();
-    }
-
-    unsigned char max_bus = 0;
-
-    result = ::pread(mcfg_handle, (void *)&max_bus, sizeof(unsigned char), 55);
-
-    ::close(mcfg_handle);
-    if (result != sizeof(unsigned char))
-    {
-        throw std::exception();
-    }
-
-    if (bus > (unsigned)max_bus)
-    {
-        std::cout << "WARNING: Requested bus number " << bus << " is larger than the max bus number " << (unsigned)max_bus << "\n";
-        throw std::exception();
-    }
-
-    // std::cout << "PCI config base addr: "<< std::hex << base_addr<< "\n" << std::dec;
-
-    base_addr += (bus * 1024ULL * 1024ULL + device * 32ULL * 1024ULL + function * 4ULL * 1024ULL);
-}
-
-
-bool PciHandleM::exists(uint32 /*groupnr_*/, uint32 /* bus_*/, uint32 /* device_ */, uint32 /* function_ */)
-{
-    int handle = ::open("/dev/mem", O_RDWR);
-
-    if (handle < 0) {
-        perror("error opening /dev/mem");
-        return false;
-    }
-
-    ::close(handle);
-
-    handle = PciHandle::openMcfgTable();
-    if (handle < 0) {
-        return false;
-    }
-
-    ::close(handle);
-
-    return true;
-}
-
-int32 PciHandleM::read32(uint64 offset, uint32 * value)
-{
-    warnAlignment<4>("PciHandleM::read32", false, offset);
-    return ::pread(fd, (void *)value, sizeof(uint32), offset + base_addr);
-}
-
-int32 PciHandleM::write32(uint64 offset, uint32 value)
-{
-    warnAlignment<4>("PciHandleM::write32", false, offset);
-    return ::pwrite(fd, (const void *)&value, sizeof(uint32), offset + base_addr);
-}
-
-int32 PciHandleM::read64(uint64 offset, uint64 * value)
-{
-    warnAlignment<4>("PciHandleM::read64", false, offset);
-    return ::pread(fd, (void *)value, sizeof(uint64), offset + base_addr);
-}
-
-PciHandleM::~PciHandleM()
-{
-    if (fd >= 0) ::close(fd);
-}
-
-#endif // PCM_USE_PCI_MM_LINUX
-
 // mmapped I/O version
 
 MCFGHeader PciHandleMM::mcfgHeader;
diff --git a/src/pci.h b/src/pci.h
index b639b8a8..e771534c 100644
--- a/src/pci.h
+++ b/src/pci.h
@@ -49,7 +49,6 @@ class PciHandle
     DWORD pciAddress;
 #endif
 
-    friend class PciHandleM;
     friend class PciHandleMM;
 
     PciHandle();                                // forbidden
@@ -79,40 +78,7 @@ typedef PciHandle PciHandleType;
 typedef PciHandle PciHandleType;
 #elif defined(__FreeBSD__) || defined(__DragonFly__)
 typedef PciHandle PciHandleType;
-#else
-
-// read/write PCI config space using physical memory
-class PciHandleM
-{
-#ifdef _MSC_VER
-
-#else
-    int32 fd;
-#endif
-
-    uint32 bus;
-    uint32 device;
-    uint32 function;
-    uint64 base_addr;
-
-    PciHandleM() = delete;             // forbidden
-    PciHandleM(PciHandleM &) = delete; // forbidden
-    PciHandleM & operator = (PciHandleM &) = delete; // forbidden
-
-public:
-    PciHandleM(uint32 bus_, uint32 device_, uint32 function_);
-
-    static bool exists(uint32 groupnr_, uint32 bus_, uint32 device_, uint32 function_);
-
-    int32 read32(uint64 offset, uint32 * value);
-    int32 write32(uint64 offset, uint32 value);
-
-    int32 read64(uint64 offset, uint64 * value);
-
-    virtual ~PciHandleM();
-};
-
-#ifndef _MSC_VER
+#elif defined(__linux__)
 
 // read/write PCI config space using physical memory using mmapped file I/O
 class PciHandleMM
@@ -125,11 +91,9 @@ class PciHandleMM
     uint32 function;
     uint64 base_addr;
 
-#ifdef __linux__
     static MCFGHeader mcfgHeader;
     static std::vector<MCFGRecord> mcfgRecords;
     static void readMCFG();
-#endif
 
     PciHandleMM() = delete;             // forbidden
     PciHandleMM(const PciHandleMM &) = delete; // forbidden
@@ -147,9 +111,7 @@ class PciHandleMM
 
     virtual ~PciHandleMM();
 
-#ifdef __linux__
     static const std::vector<MCFGRecord> & getMCFGRecords();
-#endif
 };
 
 #ifdef PCM_USE_PCI_MM_LINUX
@@ -158,8 +120,8 @@ class PciHandleMM
 #define PciHandleType PciHandle
 #endif
 
-#endif //  _MSC_VER
-
+#else
+#error "Platform not supported"
 #endif
 
 template <class F>