(1) In PCI V2.1 standard, I/O space of PCI device is less than 256byte. But SH7751 requires 1Mbyte.
(2) PCI V2.1 standard supports any combinations of value of BE<3:0> when receiving configuration access. But in the SH7751, value of BE<3:0> is ignored and only longword access is supported.
(SH7751R conforms to PCI V2.1 standard.)