Please see https://bugs.freedesktop.org/show_bug.cgi?id=98158 The sis driver fails with "SiSMapMem() failed", but this appears to be caused by an incompatibility between libpciaccess pci_device_map_range() and newer linux kernels after 4.4.
Problem is triggered by: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=90a545e981267e917b9d698ce07affd69787db87 which suggests: Any application using /dev/mem or mmap of sysfs pci resources will now need to perform the extra step of either: 1/ Disabling the driver, for example: echo <device id> > /dev/bus/<parent bus>/drivers/<driver name>/unbind ...
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