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Comment by jeromenerf

Kernel parameters are usually documented in the kernel-parameters.txt file in the source. See https://github.com/torvalds/linux/blob/master/Documentation/...:

  hpbussize=nn The minimum amount of additional bus numbers
    reserved for buses below a hotplug bridge.
    Default is 1.

The way to get from the error "No bus number available for hot-added bridge" at https://github.com/torvalds/linux/blob/master/drivers/pci/pr... to this specific kernel param is still a bit involved.

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