On Thu, Apr 28, 2011 at 4:06 PM, Xianghua Xiao <xiaoxianghua@xxxxxxxxx> wrote: > I have a FPGA-PCIe device and a FPGA-PCI device that are empty at > kernel boot time, they're only loaded after kernel is up. After I load > FPGA images, "lspci" can not show the device, "echo 1 > > /sys/bus/pci/rescan" also does nothing about it. With a reboot I can > see the devices are allocated correctly though, but I want to avoid > the reboot. > > I checked at fakephp(which is to be deprecated) and hotplug/rescan, > none of that worked for this scenario. > > Can 'rescan' handle cases like this? or, is there a way that I tell > the kernel to reserve a few BARs somehow in the PCI topology at > bootime so I can "insert" the FPGAs later? well, you did not send out the lspci -tv yet. assume lspci tree like this +-[0000:c0]-+-00.0- | | | +-01.0-[c3]-- | +-03.0-[c4-c9]----00.0-[c5-c7]--+-02.0-[c6]--+-00.0 your FPGA so c0:03.0 is pcie root port, c4:00.0 is your pcie switch upstream port c5:02.0 is your pcie switch downstream port c6:0 is your FPGA controller. so you could remove c0:03.0 or c4:00.0 or c5:02.0, then do rescan. --- depend if your BIOS allocate the right value to the c0:03.0 Yinghai -- 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
