You mean to access extra reg space (4096 bytes) for PCI-E device?
We don't need to touch that extra space ....in LinuxBIOS. Under LinuxBIOS + kernel + IB driver, the IB adapter works well with S289x. need to create one entry in mptable for the device. Otherwise it can not get INT.
Currently I can not make MSI work....Kernel 2.6.