From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail3.rossvideo.com (mail3.rossvideo.com [72.1.218.233]) by ozlabs.org (Postfix) with ESMTP id 69882B70EF for ; Sat, 29 Jan 2011 05:49:12 +1100 (EST) Message-ID: <4D430CD4.6060201@rossvideo.com> Date: Fri, 28 Jan 2011 13:37:08 -0500 From: Matias Garcia MIME-Version: 1.0 To: linuxppc-dev@lists.ozlabs.org Subject: PCIe end-point on FPGA doesn't show up on PCI bus when configured Content-Type: text/plain; charset=ISO-8859-1; format=flowed List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , I'm running a vanilla linux 2.6.37 kernel on a Freescale P2020 dual-core processor, and have the following conundrum: I configure the FPGA which brings up a PCIe interface to the processor. I scan both PCI buses on the system (I believe the second bus is behind the Freescale integrated bridge on the first), and it doesn't show up. I initiate a reset on the processor, and both U-boot and Linux now see the FPGA PCI device at 0000:01:00.00. I've noticed some of the memory mappings in the PCI bridge windows are different between the two boot sequences. I've tried all manner of pci calls (including the pcibios_fixup routines) on the bridge device (including removing and re-scanning it), and on bus 1, which is otherwise empty, to no avail. Following are some debug listings from dmesg; any help/ideas in tracking down the problem (hardware or software) is greatly appreciated. #Boot without FPGA configured: Found FSL PCI host bridge at 0x00000008ff70a000. Firmware bus number: 0->255 PCI host bridge /pcie@8ff70a000 ranges: MEM 0x0000000880000000..0x000000088fffffff -> 0x0000000080000000 IO 0x00000008a0000000..0x00000008a000ffff -> 0x0000000000000000 /pcie@8ff70a000: PCICSRBAR @ 0xfff00000 /pcie@8ff70a000: WARNING: Outbound window cfg leaves gaps in memory map. Adjusting the memory map could reduce unnecessary bounce buffering. /pcie@8ff70a000: DMA window size is 0x80000000 MPC85xx RDB board from Freescale Semiconductor <...> PCI: Probing PCI hardware pci 0000:00:00.0: [1957:0070] type 1 class 0x000b20 pci 0000:00:00.0: ignoring class b20 (doesn't match header type 01) pci 0000:00:00.0: supports D1 D2 pci 0000:00:00.0: PME# supported from D0 D1 D2 D3hot D3cold pci 0000:00:00.0: PME# disabled pci 0000:00:00.0: PCI bridge to [bus 01-ff] pci 0000:00:00.0: bridge window [io 0x0000-0x0000] (disabled) pci 0000:00:00.0: bridge window [mem 0x00000000-0x000fffff] (disabled) pci 0000:00:00.0: bridge window [mem 0x00000000-0x000fffff pref] (disabled) PCI 0000:00 Cannot reserve Legacy IO [io 0xffbed000-0xffbedfff] pci 0000:00:00.0: PCI bridge to [bus 01-01] pci 0000:00:00.0: bridge window [io 0xffbed000-0xffbfcfff] pci 0000:00:00.0: bridge window [mem 0x880000000-0x88fffffff] pci 0000:00:00.0: bridge window [mem pref disabled] pci 0000:00:00.0: enabling device (0106 -> 0107) pci_bus 0000:00: resource 0 [io 0xffbed000-0xffbfcfff] pci_bus 0000:00: resource 1 [mem 0x880000000-0x88fffffff] pci_bus 0000:01: resource 0 [io 0xffbed000-0xffbfcfff] pci_bus 0000:01: resource 1 [mem 0x880000000-0x88fffffff] #Reset with FPGA configured: Found FSL PCI host bridge at 0x00000008ff70a000. Firmware bus number: 0->255 PCI host bridge /pcie@8ff70a000 ranges: MEM 0x0000000880000000..0x000000088fffffff -> 0x0000000080000000 IO 0x00000008a0000000..0x00000008a000ffff -> 0x0000000000000000 /pcie@8ff70a000: PCICSRBAR @ 0xfff00000 /pcie@8ff70a000: WARNING: Outbound window cfg leaves gaps in memory map. Adjusting the memory map could reduce unnecessary bounce buffering. /pcie@8ff70a000: DMA window size is 0x80000000 MPC85xx RDB board from Freescale Semiconductor <...> PCI: Probing PCI hardware pci 0000:00:00.0: [1957:0070] type 1 class 0x000b20 pci 0000:00:00.0: ignoring class b20 (doesn't match header type 01) pci 0000:00:00.0: supports D1 D2 pci 0000:00:00.0: PME# supported from D0 D1 D2 D3hot D3cold pci 0000:00:00.0: PME# disabled pci 0000:01:00.0: [1172:0004] type 0 class 0x001000 pci 0000:01:00.0: reg 10: [mem 0x80000000-0x80ffffff] pci 0000:01:00.0: reg 14: [mem 0x81000000-0x81ffffff] pci 0000:01:00.0: reg 18: [mem 0x82000000-0x82ffffff] pci 0000:00:00.0: PCI bridge to [bus 01-ff] pci 0000:00:00.0: bridge window [io 0x0000-0x0000] (disabled) pci 0000:00:00.0: bridge window [mem 0x80000000-0x82ffffff] pci 0000:00:00.0: bridge window [mem 0x10000000-0x000fffff pref] (disabled) irq: irq 0 on host /soc@8ff700000/pic@40000 mapped to virtual irq 16 PCI 0000:00 Cannot reserve Legacy IO [io 0xffbed000-0xffbedfff] pci 0000:00:00.0: PCI bridge to [bus 01-01] pci 0000:00:00.0: bridge window [io 0xffbed000-0xffbfcfff] pci 0000:00:00.0: bridge window [mem 0x880000000-0x88fffffff] pci 0000:00:00.0: bridge window [mem pref disabled] pci 0000:00:00.0: enabling device (0106 -> 0107) pci_bus 0000:00: resource 0 [io 0xffbed000-0xffbfcfff] pci_bus 0000:00: resource 1 [mem 0x880000000-0x88fffffff] pci_bus 0000:01: resource 0 [io 0xffbed000-0xffbfcfff] pci_bus 0000:01: resource 1 [mem 0x880000000-0x88fffffff] Cheers, Matias -- *Matias Garcia* /Embedded Software Developer/ Ross Video | Live Production Technology www.rossvideo.com +1 (613) 228 1198 x4264