Hi Lorenzo, today i tried to boot up the most recent vanilla kernel on my Freescale i.mx6 board. I ran into trouble regarding PCI enumeration. [ 0.431949] imx6q-pcie 1ffc000.pcie: PCI host bridge to bus 0000:00 [ 0.431976] pci_bus 0000:00: root bus resource [io 0x1000-0xffff] [ 0.431996] pci_bus 0000:00: root bus resource [mem 0x01000000-0x01efffff] [ 0.432022] pci_bus 0000:00: root bus resource [bus 00-ff] [ 0.433271] PCI: bus0: Fast back to back transfers disabled [ 0.433629] pci 0000:00:00.0: PCI bridge to [bus 01-ff] [ 0.435181] PCI: bus1: Fast back to back transfers disabled [ 0.435564] pci 0000:00:00.0: BAR 0: assigned [mem 0x01000000-0x010fffff] [ 0.435593] pci 0000:00:00.0: BAR 8: no space for [mem size 0x01000000] [ 0.435613] pci 0000:00:00.0: BAR 8: failed to assign [mem size 0x01000000] [ 0.435635] pci 0000:00:00.0: BAR 9: assigned [mem 0x01100000-0x011fffff pref] [ 0.435655] pci 0000:00:00.0: BAR 6: assigned [mem 0x01200000-0x0120ffff pref] [ 0.435676] pci 0000:00:00.0: BAR 7: assigned [io 0x1000-0x1fff] [ 0.435705] pci 0000:01:00.0: BAR 2: no space for [mem size 0x00200000] [ 0.435722] pci 0000:01:00.0: BAR 2: failed to assign [mem size 0x00200000] [ 0.435739] pci 0000:01:00.0: BAR 1: no space for [mem size 0x00004000] [ 0.435754] pci 0000:01:00.0: BAR 1: failed to assign [mem size 0x00004000] [ 0.435770] pci 0000:01:00.0: BAR 0: no space for [mem size 0x00000100] [ 0.435786] pci 0000:01:00.0: BAR 0: failed to assign [mem size 0x00000100] [ 0.435804] pci 0000:00:00.0: PCI bridge to [bus 01] [ 0.435826] pci 0000:00:00.0: bridge window [io 0x1000-0x1fff] [ 0.435855] pci 0000:00:00.0: bridge window [mem 0x01100000-0x011fffff pref] there are several fails assigning memory ressources to pci-devices. i bisect down this trouble to commit id: dff22d2054b5dbb1889f20c03959dd0c494fab8c : PCI: Call pci_read_bridge_bases() from core instead of arch code For testing purpose i've reverted this commit on a local branch and everythings works fine, as before. [ 0.431976] imx6q-pcie 1ffc000.pcie: PCI host bridge to bus 0000:00 [ 0.432004] pci_bus 0000:00: root bus resource [io 0x1000-0xffff] [ 0.432023] pci_bus 0000:00: root bus resource [mem 0x01000000-0x01efffff] [ 0.432047] pci_bus 0000:00: root bus resource [bus 00-ff] [ 0.433302] PCI: bus0: Fast back to back transfers disabled [ 0.435122] PCI: bus1: Fast back to back transfers disabled [ 0.435504] pci 0000:00:00.0: BAR 0: assigned [mem 0x01000000-0x010fffff] [ 0.435535] pci 0000:00:00.0: BAR 8: assigned [mem 0x01100000-0x013fffff] [ 0.435557] pci 0000:00:00.0: BAR 6: assigned [mem 0x01400000-0x0140ffff pref] [ 0.435585] pci 0000:01:00.0: BAR 2: assigned [mem 0x01200000-0x013fffff] [ 0.435626] pci 0000:01:00.0: BAR 1: assigned [mem 0x01100000-0x01103fff] [ 0.435665] pci 0000:01:00.0: BAR 0: assigned [mem 0x01104000-0x011040ff] [ 0.435703] pci 0000:00:00.0: PCI bridge to [bus 01] [ 0.435728] pci 0000:00:00.0: bridge window [mem 0x01100000-0x013fffff] Further i can break down the failure to "drivers/pci/probe.c" line #924. If i comment out the "pci_read_bridge_bases(child);" also everything works well. I have to confess, that my knowledge about the whole PCI thing in the kernel is not very deep, so it is not possible for me to figure out what is going wrong. maybe some of you can help? best regards, Hannes -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
