hi, tiejun.chen: When I use ioremap, the card seems to work fine. That is, I can access part of all register. My PCIe card is a rs232 expand card, it has some standard UART register, for example the SCR(scratch register). My driver can access the SCR(write and read) normally, but the other registers behave odd. For example, the DLM should be 0, but it reads 5. The card has a software reset bit, when it is set to 1, the card reset itself. When it finished reset, this reset bit should be back to 0. But In sbc8548, when I set this bit, it remains high. So I guess, the area I accessed is not the PCIe card, instead it maybe some RAM in the system. :> I'm sure the card hardware is OK, I insert it into the 8641d board, it works ok.
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