I am trying to get the PCIe interfaces of a Freescale MPC8641D working in endpoint mode (i.e. as a PCI device rather than a PCI root complex host).
I can get the device to show up on the host's PCI bus, I can program the inbound ATMUs such that the BARS are updated when the host (re-)scans them, but I cannot for the life of me get the PPC's Outbound ATMUS to work. When I attempt to program them, I can program ALL the registers EXCEPT the OWBAR - which steadfastly remains 0 no matter what I write to it. As a result, when I attempt to bus master out from the PPC to the PCIe address spaces via the outbound ATMUs, I get a bus fault on the PPC as there is no device at the address I am accessing. I've double-checked the LAWs to make sure the PEX is mapped into local space, I've put the OWBAR in that address space, I've tried different outbound ATMUs, and NOTHING works. Not ATMU0, not ATMU1, etc. I've been trying to work with our Freescale rep, but I am getting nowhere on that front. Does anybody have any suggestions on what I might be doing wrong? I mean, it looks like it should be a simple out_be32(addr_of_OWBAR,value), just like all the other accesses to the ATMU registers that seem to be working (as in, I read back what I wrote). _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
